Voltage conversion circuit and dc front end board

Abstract

The utility model discloses a voltage conversion circuit and direct current front end board, including DCDC converter, its input end is connected with external 12V power supply through filter, and, voltage stabilizing unit, voltage stabilizing unit includes the positive voltage stabilizing unit and negative voltage stabilizing unit of parallelly arranged, and DCDC converter's output VOUTP and the input of positive voltage stabilizing unit electric connection, DCDC converter's output VOUTN and the input of negative voltage stabilizing unit electric connection. This voltage conversion circuit and direct current front end board through the input of DCDC converter is connected with external 12V power supply through filter, can reduce the influence of noise and ripple in external input power supply to voltage conversion process, simultaneously, the starting end of DCDC converter is connected to between first filter inductance and filter input, makes the starting end avoid the response lag introduced by filter main input path.

Description

Technical Field

[0001] This utility model relates to the technical field of power conversion, and in particular to a voltage conversion circuit and a DC front-end board. Background Technology

[0002] In the workflow of a quantum measurement and control system, externally acquired signals need to be converted into radio frequency signals in real time to achieve long-distance, high-precision transmission. The front-end signal conditioning board not only needs to provide a highly stable, ultra-low noise power supply reference for the DAC and surrounding analog peripheral circuits, but also needs to perform impedance matching, amplitude shaping, and link conditioning on the high-speed differential signal output by the DAC to achieve reliable driving of the subsequent radio frequency modules.

[0003] Conventional switching power supplies inherently possess ripple and high-frequency switching noise. Ordinary single-stage LDOs have limited ability to attenuate and suppress high-frequency noise, which can easily degrade the signal-to-noise ratio and dynamic range of the DAC output signal. At the same time, general-purpose operational amplifiers have limited bandwidth and insufficient high-frequency common-mode rejection ratio, which cannot guarantee the waveform integrity of the high-speed DAC differential signal in the radio frequency band, and can easily introduce signal distortion and additional spurious components, further deteriorating the system power supply ripple and signal purity.

[0004] Especially in voltage conversion circuits that require simultaneous output of positive and negative voltages, the startup state of the DC / DC converter directly affects the setup timing of the positive and negative output terminals. If the DC / DC converter's startup is unstable, the input voltages of the subsequent positive and negative voltage regulator units will also fluctuate, thus affecting the stability of the positive and negative power supply rails. For subsequent circuits such as differential amplifiers, which are highly sensitive to power supply noise and stability, startup fluctuations in the positive and negative power supply rails can easily cause output offset, transient distortion, or decreased signal conditioning stability.

[0005] In ultra-high precision applications such as quantum measurement and control, the traditional single-stage power supply architecture cannot simultaneously address the core contradiction between high power supply efficiency and ultra-low output ripple, necessitating further improvement solutions. Utility Model Content

[0006] In view of the problems existing in the above-mentioned voltage conversion circuits and DC front-end boards, this utility model is proposed.

[0007] Therefore, one of the objectives of this utility model is to provide a voltage conversion circuit, which aims to provide a voltage conversion circuit and a conversion board with reliable timing, high precision and high stability to achieve high-precision power conversion.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a DC / DC converter whose input terminal is electrically connected to an external 12V power supply via a filter; and a voltage regulator unit, comprising a positive voltage regulator unit and a negative voltage regulator unit connected in parallel; the output terminal VOUTP of the DC / DC converter is electrically connected to the input terminal of the positive voltage regulator unit, and the output terminal VOUTN of the DC / DC converter is electrically connected to the input terminal of the negative voltage regulator unit; wherein, the input port of the filter is connected to a first filter inductor, and the start-up terminal of the DC / DC converter is connected between the first filter inductor and the input terminal of the filter.

[0009] In a preferred embodiment of the voltage conversion circuit described in this utility model, a second filter inductor is connected to the power supply ground terminal of the filter.

[0010] In a preferred embodiment of the voltage conversion circuit of this utility model, the following configuration is provided: port PG11 of the DC / DC converter is connected to a first resistor; port PG21 of the DC / DC converter is connected to a second resistor; both the first and second resistors are connected to the input ports of the filter; and each input pin of ports VIN1 and VIN2 of the DC / DC converter is connected to the output terminal of the filter. A third and a fourth resistor are connected in series between ports VIN1 and VIN2 of the DC / DC converter and ground. Port RUN1 of the DC / DC converter is connected between the third and fourth resistors via a nineteenth resistor; and port RUN2 of the DC / DC converter is connected between the third and fourth resistors via a twentieth resistor.

[0011] In a preferred embodiment of the voltage conversion circuit of this utility model, the input terminal IN1 of the positive voltage regulator is connected to one end of the first capacitor, and the output terminal OUT1 of the positive voltage regulator is connected to the second capacitor, and the other ends of the first capacitor and the second capacitor are both grounded; the port PGFB1 of the positive voltage regulator is connected to the output terminal OUT1 through the fifth resistor, and the port PGFB1 of the positive voltage regulator is grounded through the sixth resistor; the port EN1 of the positive voltage regulator is connected to one end of the first capacitor through the seventh resistor, and the port PG12 of the positive voltage regulator is connected to one end of the first capacitor through the eighth resistor.

[0012] In a preferred embodiment of the voltage conversion circuit of this utility model, the input terminal IN2 of the negative voltage regulator unit is connected to one end of the third capacitor, and the output terminal OUT2 of the negative voltage regulator unit is connected to one end of the fourth capacitor, and the other ends of the third capacitor and the fourth capacitor are both grounded; the port PGFB2 of the negative voltage regulator unit is connected to the output terminal OUT2 through the ninth resistor, and the port PGFB2 of the negative voltage regulator unit is grounded through the tenth resistor; the port EN2 of the negative voltage regulator unit is connected to one end of the third capacitor through the eleventh resistor, and the port PG22 of the negative voltage regulator unit is connected to one end of the third capacitor through the twelfth resistor.

[0013] The beneficial effects of this invention are as follows: By connecting the input terminal of the DC / DC converter to an external 12V power supply via a filter, the influence of noise and ripple in the external input power supply on the voltage conversion process can be reduced. Simultaneously, by connecting the startup terminal of the DC / DC converter between the first filter inductor and the filter input terminal, the startup terminal avoids the response lag introduced by the filter's main input path, thereby improving the power-on startup stability of the DC / DC converter. Furthermore, the positive and negative output terminals of the DC / DC converter are connected to a positive voltage regulator unit and a negative voltage regulator unit, respectively, so that the positive and negative power supplies are output after secondary voltage regulation. This balances input filtering, startup reliability, and positive and negative power supply stability, reducing the impact of power-on transient fluctuations on subsequent circuits.

[0014] Another objective of this invention is to provide a DC front-end board, which aims to establish a signal transmission channel based on a stable power supply provided by a voltage conversion circuit, thereby enabling high-speed signal transmission.

[0015] As a preferred embodiment of the DC front-end board of this utility model, it includes a voltage conversion circuit and a plurality of differential amplifiers, wherein the power supply terminal VS+ of the differential amplifiers is connected to the output terminal OUT1 of the positive voltage regulator unit; and the power supply terminal VS- of the differential amplifiers is connected to the output terminal OUT2 of the negative voltage regulator unit.

[0016] In a preferred embodiment of the DC front-end board of this utility model, the differential amplifier's port IN+ and port IN- are respectively connected to a thirteenth resistor and a fourteenth resistor; the differential amplifier's port FB- is connected to the differential amplifier's port IN+ through a fifteenth resistor, and the differential amplifier's port FB+ is connected to the differential amplifier's port IN- through a sixteenth resistor.

[0017] In a preferred embodiment of the DC front-end board of this utility model, the differential amplifier's port OUT+ is connected to the input terminal of the output interface through the seventeenth resistor, and the differential amplifier's port OUT- is grounded through the eighteenth resistor.

[0018] As a preferred embodiment of the DC front-end board of this utility model, it further includes a plurality of terminals, the terminals including composite terminals and power supply terminals, wherein the A30 pin and B30 pin of the composite terminal are both connected to an external 12V power supply; the composite terminal includes differential signal pairs composed of signal pins B03 and B06, signal pins B09 and B12, signal pins B15 and B18, and signal pins B21 and B24, and each of the differential signal pairs is electrically connected to an external signal source.

[0019] In a preferred embodiment of the DC front-end board of this utility model, the E01 pin and F01 pin of the power supply terminal are both connected to an external 12V power supply.

[0020] The beneficial effects of this utility model are as follows: This DC front-end board provides a stable positive and negative power supply based on the voltage conversion circuit, which provides a reliable operating power supply for the differential amplifier, enabling the differential amplifier to stably amplify and condition the externally input differential signal; at the same time, by forming a high-speed signal transmission channel through the wiring terminals, differential amplifier and output interface, it can reduce the impact of power supply fluctuations and interference on signal transmission, and improve the stability of signal waveform, transmission reliability and the driving stability of subsequent modules. Attached Figure Description

[0021] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the system's topology is shown.

[0023] Figure 2 A schematic diagram of the filter's circuit structure is shown; Figure 3 A schematic diagram of the circuit structure of a DC / DC converter is shown. Figure 4 A schematic diagram of the circuit structure of the positive voltage regulator unit is shown; Figure 5 A schematic diagram of the circuit structure of the negative voltage regulator unit is shown; Figure 6 A schematic diagram of the circuit structure of a differential amplifier is shown. Figure 7 A schematic diagram of the circuit structure of the composite terminal is shown; Figure 8 A schematic diagram of the circuit structure of the power supply terminals is shown.

[0024] In the diagram: 100, DC / DC converter; 101, filter; 200, voltage regulator unit; 201, positive voltage regulator unit; 202, negative voltage regulator unit; 300, differential amplifier; R16, first resistor; R17, second resistor; R2, third resistor; R7, fourth resistor; R42, fifth resistor; R46, sixth resistor; R41, seventh resistor; R43, eighth resistor; R45, ninth resistor; R50, tenth resistor; R44, eleventh resistor; R47, twelfth resistor; R91, Thirteenth resistor; R92, Fourteenth resistor; R89, Fifteenth resistor; R93, Sixteenth resistor; R90, Seventeenth resistor; R96, Eighteenth resistor; R4, Nineteenth resistor; R8, Twentieth resistor; C26, First capacitor; C25, Second capacitor; C27, Third capacitor; C28, Fourth capacitor; FB1, First filter inductor; FB2, Second filter inductor; J3, Output interface; 400, Terminal block; 401, Composite terminal block; 402, Power supply terminal block. Detailed Implementation

[0025] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0027] Example 1, referring to Figure 1 and Figure 2 This is the first embodiment of the present invention, providing a voltage conversion circuit. The device includes a DC / DC converter 100, whose input terminal is electrically connected to an external 12V power supply via a filter 101; and a voltage regulator unit 200, which includes a positive voltage regulator unit 201 and a negative voltage regulator unit 202 connected in parallel. The output terminal VOUTP of the DC / DC converter 100 is electrically connected to the input terminal of the positive voltage regulator unit 201, and the output terminal VOUTN of the DC / DC converter 100 is electrically connected to the input terminal of the negative voltage regulator unit 202. The input port of the filter 101 is connected to a first filter inductor FB1, and the start-up terminal of the DC / DC converter 100 is connected between the first filter inductor FB1 and the input terminal of the filter 101.

[0028] In this embodiment, the voltage conversion circuit is used to convert the externally input 12V DC power supply into the positive and negative supply voltages required by the subsequent circuits. The subsequent circuits can be differential amplifiers, analog signal conditioning circuits, data conversion circuits, or other precision circuits that require positive and negative power supplies. Since the external 12V power supply may carry conducted noise, high-frequency ripple, and power-on transient interference when connected to the DC front-end board, this embodiment sets a filter 101 before the input terminal of the DC / DC converter 100, so that the external 12V power supply is filtered before entering the DC / DC converter 100, thereby reducing the impact of input power supply interference on the DC / DC converter 100 and the subsequent voltage regulation unit 200.

[0029] Specifically, see the attached document. Figure 2 The input terminal of filter 101 corresponds to port 1, the power ground terminal of filter 101 corresponds to port 3, the output port of filter 101 corresponds to port 2, and the device-side ground terminal of filter 101 corresponds to ports 5, 4, and 6.

[0030] An external 12V power supply is first connected to a first filter inductor FB1, which is located at the input of filter 101. FB1 performs pre-stage filtering on the power path before the external 12V power supply enters filter 101. After passing through FB1, the external 12V power supply enters filter 101, and then the output of filter 101 supplies power to the input of DC / DC converter 100. Thus, FB1 and filter 101 together form an input filtering path, which can reduce high-frequency noise and transient disturbances in the external power supply, enabling DC / DC converter 100 to obtain a relatively stable input power supply.

[0031] Furthermore, the startup terminal of the DC / DC converter 100 is connected between the first filter inductor FB1 and the input terminal of the filter 101. That is, the startup terminal of the DC / DC converter 100 is not directly connected to the output terminal of the filter 101, but rather at a node after the first filter inductor FB1 and before the input terminal of the filter 101. This node has already undergone preliminary filtering by the first filter inductor FB1, but has not yet passed through the main filtering path of the filter 101. Therefore, when an external 12V power supply is applied, the startup terminal of the DC / DC converter 100 can obtain a startup voltage or startup control signal from this node, enabling the DC / DC converter 100 to meet the startup conditions.

[0032] By employing the aforementioned startup connection method, the startup of the DC / DC converter 100 can avoid complete reliance on the output voltage of the filter 101. Since the filter 101 experiences a lag in main input voltage establishment due to its equivalent impedance, energy storage process, or transient response characteristics, the startup terminal can obtain startup conditions earlier through the node between the first filter inductor FB1 and the input of the filter 101, thereby improving the power-on startup response of the DC / DC converter 100. Thus, while maintaining the input filtering function, the risk of startup delay or instability caused by the filtering path is reduced, and the startup stability of the DC / DC converter 100 can be improved through the first filter inductor FB1.

[0033] During voltage conversion, the DC / DC converter 100 receives an external 12V power supply processed by the filter 101 and converts this external 12V power supply into at least one positive output and one negative output. Specifically, the output terminal VOUTP of the DC / DC converter 100 is electrically connected to the input terminal of the positive voltage regulator unit 201, and the output terminal VOUTN of the DC / DC converter 100 is electrically connected to the input terminal of the negative voltage regulator unit 202. This provides input power to the subsequent positive voltage regulator unit 201 and negative voltage regulator unit 202.

[0034] The voltage regulator unit 200 includes a positive voltage regulator unit 201 and a negative voltage regulator unit 202 connected in parallel. The positive voltage regulator unit 201 performs secondary voltage regulation on the positive power supply output from the DC / DC converter 100's output terminal VOUTP, forming a stable positive supply voltage. The negative voltage regulator unit 202 performs secondary voltage regulation on the negative power supply output from the DC / DC converter 100's output terminal VOUTN, forming a stable negative supply voltage. The positive voltage regulator unit 201 and the negative voltage regulator unit 202 correspond to the positive and negative power rails, respectively, and work together to provide stable positive and negative power supplies for subsequent circuits requiring bipolar power.

[0035] In the operation of this embodiment, when an external 12V power supply is connected, the power supply first undergoes pre-stage filtering through the first filter inductor FB1. One path of the power supply is further filtered by filter 101 and then enters the input terminal of the DC / DC converter 100, serving as the main input power supply for the DC / DC converter 100. The other path forms a startup power-taking node between the first filter inductor FB1 and the input terminal of filter 101, enabling the DC / DC converter 100 to obtain startup conditions. Subsequently, after startup, the DC / DC converter 100 converts the input power supply and provides a positive input to the positive voltage regulator unit 201 through its output terminal VOUTP, and a negative input to the negative voltage regulator unit 202 through its output terminal VOUTN. After the positive voltage regulator unit 201 and the negative voltage regulator unit 202 regulate the corresponding inputs, they output stable positive and negative supply voltages, respectively.

[0036] Therefore, this embodiment sets up a complete power processing chain, and by connecting the startup terminal of the DC / DC converter 100 between the first filter inductor FB1 and the input terminal of the filter 101, a startup power-taking path distinct from the main input filtering path is formed. This structure can take into account both input power filtering and the startup response of the DC / DC converter 100, giving the voltage conversion circuit better startup reliability during the power-on phase, and providing a more stable positive and negative power supply through the positive voltage regulator unit 201 and the negative voltage regulator unit 202 during the normal operation phase, thereby reducing the impact of power supply fluctuations on subsequent analog circuits or differential signal conditioning circuits.

[0037] Example 2, refer to Figure 2 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a second filter inductor FB2 is provided at the power ground terminal of the filter 101.

[0038] Compared to Embodiment 1, in this embodiment, the filter 101 not only forms a pre-stage filtering path with the external 12V power supply through the first filtering inductor FB1 at the input port, but also connects the second filtering inductor FB2 to its power supply ground terminal, so that both the input power supply path and the ground return path of the filter 101 have filtering and suppression capabilities.

[0039] Specifically, the first filter inductor FB1 is mainly located on the positive input path of the external 12V power supply entering the filter 101, used to suppress high-frequency interference, spike noise, and transient ripple in the positive power supply path of the external 12V power supply; the second filter inductor FB2 is connected to the power supply ground terminal of the filter 101, used to suppress high-frequency noise in the ground return path of the filter 101. Thus, the input terminal and ground terminal of the filter 101 respectively form corresponding filter nodes, enabling the external 12V power supply to be attenuated in both the power supply path and the return path before entering the DC / DC converter 100.

[0040] When the voltage conversion circuit is powered on, the external 12V power supply enters the input terminal of filter 101 through the first filter inductor FB1. Simultaneously, the power supply ground terminal of filter 101 forms a return path with the ground terminal through the second filter inductor FB2. Since power supply noise can be transmitted not only along the forward power supply path but also coupled to subsequent circuits via the ground return path, the placement of the second filter inductor FB2 at the power supply ground terminal of filter 101 reduces the impact of high-frequency disturbances in the ground return path on the output terminal of filter 101 and the input terminal of DC / DC converter 100.

[0041] Furthermore, the second filter inductor FB2 works in conjunction with the first filter inductor FB1 to form a more complete input filtering structure for the filter 101 during the external 12V power supply connection phase. The first filter inductor FB1 is used to improve the stability of the positive input power supply, and the second filter inductor FB2 is used to improve the stability of the ground return path. Together, they reduce the impact of input power supply noise on the startup and power conversion processes of the DC / DC converter 100.

[0042] Therefore, based on the power supply path at the startup end and the positive and negative voltage regulation output structure of Embodiment 1, this embodiment can further improve the ability of filter 101 to suppress external 12V power supply input noise, reduce the possibility of power supply ground noise being coupled to the input side of DC / DC converter 100 through filter 101, thereby improving the input power quality of DC / DC converter 100, and facilitating the formation of a more stable positive and negative power supply output by subsequent positive voltage regulation unit 201 and negative voltage regulation unit 202.

[0043] The remaining structure is the same as that in Example 1.

[0044] Example 3, referring to Figure 3 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that: port PG11 of DC / DC converter 100 is connected to the first resistor R16, port PG21 of DC / DC converter 100 is connected to the second resistor R17, the first resistor R16 and the second resistor R17 are both connected to the input port of filter 101, and each input pin of port VIN1 and port VIN2 of DC / DC converter 100 is connected to the output terminal of filter 101.

[0045] A third resistor R2 and a fourth resistor R7 are connected in series between the ports VIN1 and VIN2 of the DC / DC converter 100 and ground, and the port RUN1 of the DC / DC converter 100 is connected between the third resistor R2 and the fourth resistor R7 through the nineteenth resistor R4.

[0046] Port RUN2 of DC / DC converter 100 is connected between the third resistor R2 and the fourth resistor R7 via the twentieth resistor R8.

[0047] Compared to Embodiment 2, in this embodiment, the DC / DC converter 100 has two sets of output terminals VOUTP and VOUTN. For differentiation, refer to... Figure 3 In the figure, the output terminals VOUTP and VOUTN of the DC / DC converter 100 are distinguished as the first positive output terminal VOUT1P, the first negative output terminal VOUT1N, the second positive output terminal VOUT2P, and the second negative output terminal VOUT2N, respectively.

[0048] Specifically, the first positive output terminal VOUT1P in the diagram includes four pins: VOUT1P_0, VOUT1P_1, VOUT1P_2, and VOUT1P_3; the first negative output terminal VOUT1N includes four pins: VOUT1N_0, VOUT1N_1, VOUT1N_2, and VOUT1N_3; the second positive output terminal VOUT2P includes four pins: VOUT2P_0, VOUT2P_1, VOUT2P_2, and VOUT2P_3; and the second negative output terminal VOUT2N includes four pins: VOUT2N_0, VOUT2N_1, VOUT2N_2, and VOUT2N_3.

[0049] The first resistor R16 and the second resistor R17 are respectively connected between port PG11 and port PG21 of the DC / DC converter 100 and the input port of the filter 101, enabling ports PG11 and PG21 to form an electrical connection with the power supply node on the input side of the filter 101. Since the input port of the filter 101 is located after the first filter inductor FB1 and before the main filtering path of the filter 101, ports PG11 and PG21 can be connected to the input node that has already undergone preliminary filtering by the first filter inductor FB1 through the first resistor R16 and the second resistor R17.

[0050] Specifically, the first resistor R16 and the second resistor R17 can serve as current-limiting or pull-up connectors between ports PG11 and PG21 and the input port of filter 101, enabling a level reference related to the input power supply state to be obtained after power is supplied. Since the specific chip has different level requirements, the resistance values ​​here can be set as needed.

[0051] Furthermore, each input pin of port VIN1 and port VIN2 of the DC / DC converter 100 is connected to the output of the filter 101. Thus, the external 12V power supply, after being processed by the first filter inductor FB1 and the filter 101, can be simultaneously input to ports VIN1 and VIN2 of the DC / DC converter 100 for voltage conversion.

[0052] In this embodiment, each input pin of port VIN1 and port VIN2 is connected to the output of filter 101, allowing multiple input pins of DC / DC converter 100 to be connected to the same filtered power supply node. This arrangement helps reduce the current concentration on individual input pins, enabling a more balanced distribution of input power to the input side of DC / DC converter 100, thereby improving the stability of the main input power supply of DC / DC converter 100.

[0053] Meanwhile, a third resistor R2 and a fourth resistor R7 are connected in series between ports VIN1 and VIN2 of the DC / DC converter 100 and ground. The series connection of the third resistor R2 and the fourth resistor R7 is then established between the input power node corresponding to the output of the filter 101 and ground, thus forming a voltage divider path. Ports RUN1 and RUN2 of the DC / DC converter 100 are both connected between the third resistor R2 and the fourth resistor R7, enabling ports RUN1 and RUN2 to obtain the operating control level formed by the voltage division of the third resistor R2 and the fourth resistor R7.

[0054] Through the aforementioned connection, when an external 12V power supply is connected, the input power first passes through the first filter inductor FB1 and filter 101 into ports VIN1 and VIN2 of the DC / DC converter 100. Simultaneously, the input power nodes corresponding to ports VIN1 and VIN2 form a voltage divider through the third resistor R2 and the fourth resistor R7. This voltage divider node provides the operating control level to ports RUN1 and RUN2. Therefore, the operating ports of the DC / DC converter 100 do not directly receive the complete external 12V power supply, but instead receive the voltage divider signal formed by the third resistor R2 and the fourth resistor R7. This facilitates RUN1 and RUN2 entering the operating control state only after the input power supply reaches a predetermined state.

[0055] Furthermore, ports PG11 and PG21 are connected to the input ports of filter 101 via resistors R16 and R17, while ports VIN1 and VIN2 are connected to the output ports of filter 101. Ports RUN1 and RUN2 are connected to the voltage divider node between resistors R2 and R7. Thus, during power-on, the DC / DC converter 100 can establish its port electrical relationships through the input-side node, the filtered main input node, and the voltage divider operation control node, respectively, ensuring that the input power supply path, port reference path, and operation control path coordinate with each other.

[0056] The remaining structure is the same as that in Example 2.

[0057] Example 4, refer to Figures 4-5This is the fourth embodiment of the present invention. This embodiment differs from the third embodiment in that: the input terminal IN1 of the positive voltage regulator unit 201 is connected to one end of the first capacitor C26, and the output terminal OUT1 of the positive voltage regulator unit 201 is connected to the second capacitor C25; the other ends of both the first capacitor C26 and the second capacitor C25 are grounded; the port PGFB1 of the positive voltage regulator unit 201 is connected to the output terminal OUT1 through the fifth resistor R42, and the port PGFB1 of the positive voltage regulator unit 201 is grounded through the sixth resistor R46; the port EN1 of the positive voltage regulator unit 201 is connected to one end of the first capacitor C26 through the seventh resistor R41, and the port PG12 of the positive voltage regulator unit 201 is connected to one end of the first capacitor C26 through the eighth resistor R43.

[0058] The input terminal IN2 of the negative voltage regulator unit 202 is connected to one end of the third capacitor C27, and the output terminal OUT2 of the negative voltage regulator unit 202 is connected to one end of the fourth capacitor C28. The other ends of the third capacitor C27 and the fourth capacitor C28 are both grounded. The port PGFB2 of the negative voltage regulator unit 202 is connected to the output terminal OUT2 through the ninth resistor R45, and the port PGFB2 of the negative voltage regulator unit 202 is grounded through the tenth resistor R50. The port EN2 of the negative voltage regulator unit 202 is connected to one end of the third capacitor C27 through the eleventh resistor R44, and the port PG22 of the negative voltage regulator unit 202 is connected to one end of the third capacitor C27 through the twelfth resistor R47.

[0059] Compared to Embodiment 3, in this embodiment, the positive voltage regulator unit 201 receives the positive intermediate power supply output from the output terminal VOUTP of the DC / DC converter 100 and performs secondary voltage regulation on the positive intermediate power supply to form a stable positive power supply output. The positive voltage regulator unit 201 is disposed between the DC / DC converter 100 and the subsequent load, and its function is to further reduce the ripple, switching noise and transient fluctuations that may remain at the output terminal of the DC / DC converter 100, thereby improving the stability of the positive power supply rail.

[0060] Specifically, the input terminal IN1 of the positive voltage regulator unit 201 is connected to one end of the first capacitor C26, and the other end of the first capacitor C26 is grounded. The first capacitor C26 is located on the input side of the positive voltage regulator unit 201 and is used to filter the positive intermediate power supply input to the positive voltage regulator unit 201. When the output terminal VOUTP of the DC / DC converter 100 provides input power to the positive voltage regulator unit 201, the first capacitor C26 can absorb transient fluctuations in the input power supply and reduce the impact of sudden voltage changes on the voltage regulation process of the positive voltage regulator unit 201.

[0061] Furthermore, a second capacitor C25 is connected to the output terminal OUT1 of the positive voltage regulator unit 201, with the other end of the second capacitor C25 grounded. The second capacitor C25 is located on the output side of the positive voltage regulator unit 201 to perform output filtering and smoothing of the positive regulated power supply output by the positive voltage regulator unit 201. Through the addition of the second capacitor C25, the voltage at the output terminal OUT1 of the positive voltage regulator unit 201 can be further reduced in terms of ripple and spike interference, enabling subsequent circuits to obtain a more stable positive power supply voltage.

[0062] Regarding the feedback path, port PGFB1 of the positive voltage regulator unit 201 is connected to the output terminal OUT1 through the fifth resistor R42, and simultaneously grounded through the sixth resistor R46. The fifth resistor R42 and the sixth resistor R46 together form a voltage divider feedback path related to the output terminal OUT1, enabling port PGFB1 to obtain a feedback signal characterizing the voltage state of the output terminal OUT1. Through this feedback path, the positive voltage regulator unit 201 can perform state detection or feedback judgment on the positive regulated voltage at its output terminal, thereby helping to maintain the output voltage within a stable range.

[0063] Regarding the enable connection path, port EN1 of the positive regulator unit 201 is connected to one end of the first capacitor C26 through the seventh resistor R41. Since one end of the first capacitor C26 is connected to the input terminal IN1 of the positive regulator unit 201, port EN1 can be connected to the input-side power supply node of the positive regulator unit 201 through the seventh resistor R41. Thus, when the positive intermediate power supply at the input terminal IN1 is established, port EN1 can obtain the enable condition related to the input-side power supply state, enabling the positive regulator unit 201 to enter the working state after the input power supply reaches the corresponding state.

[0064] Furthermore, port PG12 of the positive voltage regulator unit 201 is connected to one end of the first capacitor C26 through the eighth resistor R43. This connection allows port PG12 to also be connected to the input-side power supply node of the positive voltage regulator unit 201 through the eighth resistor R43, thus forming a port connection path related to the input-side power supply state. The eighth resistor R43 can limit current and isolate the input-side power supply node between port PG12 and the input-side power supply node, preventing port PG12 from directly experiencing transient impacts from the input node.

[0065] In the operation of this embodiment, after the output terminal VOUTP of the DC / DC converter 100 outputs a positive intermediate power supply, this positive intermediate power supply enters the input terminal IN1 of the positive voltage regulator unit 201, and is filtered and buffered on the input side by the first capacitor C26. Subsequently, the positive voltage regulator unit 201 regulates the input power supply and outputs a positive regulated power supply through the output terminal OUT1. The second capacitor C25 further smooths the positive regulated power supply at the output terminal OUT1, making the output voltage more stable. At the same time, the output terminal OUT1 provides a feedback signal to the port PGFB1 after voltage division by the fifth resistor R42 and the sixth resistor R46, enabling the positive voltage regulator unit 201 to obtain the output voltage status; the ports EN1 and PG12 are connected to the input side power supply node through the seventh resistor R41 and the eighth resistor R43, respectively, to meet the enable and status connection requirements of the positive voltage regulator unit 201.

[0066] The negative voltage regulator unit 202 receives the negative intermediate power supply output from the output terminal VOUTN of the DC / DC converter 100 and performs secondary voltage regulation on the negative intermediate power supply to form a stable negative power supply output. The negative voltage regulator unit 202 works in conjunction with the positive voltage regulator unit 201 to enable the voltage conversion circuit to simultaneously provide both positive and negative regulated power supplies, thereby meeting the power supply requirements of differential amplifiers, analog signal conditioning circuits, or other bipolar power supply circuits.

[0067] Specifically, the input terminal IN2 of the negative voltage regulator unit 202 is connected to one end of the third capacitor C27, and the other end of the third capacitor C27 is grounded. The third capacitor C27 is located on the input side of the negative voltage regulator unit 202 and is used to filter the negative intermediate power supply input to the negative voltage regulator unit 202. When the output terminal VOUTN of the DC / DC converter 100 provides a negative input power supply to the negative voltage regulator unit 202, the third capacitor C27 can absorb transient fluctuations on the input side and reduce the impact of ripple and spike interference in the negative intermediate power supply on the voltage regulation process of the negative voltage regulator unit 202.

[0068] Furthermore, the output terminal of the negative voltage regulator unit 202 is connected to one end of the fourth capacitor C28, and the other end of the fourth capacitor C28 is grounded. The fourth capacitor C28 is located on the output side of the negative voltage regulator unit 202 to smooth the negative regulated power supply output by the negative voltage regulator unit 202. Through the setting of the fourth capacitor C28, a more stable negative supply voltage can be formed at the output terminal OUT2 of the negative voltage regulator unit 202, reducing output ripple, transient spikes, and voltage disturbances caused by load changes.

[0069] Regarding the feedback path, port PGFB2 of the negative voltage regulator unit 202 is connected to the output terminal OUT2 through the ninth resistor R45, and simultaneously grounded through the tenth resistor R50. The ninth resistor R45 and the tenth resistor R50 together form a voltage divider feedback path related to the output terminal OUT2, enabling port PGFB2 to obtain a feedback signal characterizing the voltage state of the output terminal of the negative voltage regulator unit 202. Therefore, the negative voltage regulator unit 202 can perform feedback detection or output state judgment based on the voltage state of the output terminal OUT2, thereby helping to maintain the stability of the negative voltage regulation output.

[0070] Regarding the enable connection path, port EN2 of the negative voltage regulator unit 202 is connected to one end of the third capacitor C27 through the eleventh resistor R44. Since one end of the third capacitor C27 is connected to the input terminal IN2 of the negative voltage regulator unit 202, port EN2 can be connected to the input-side power supply node of the negative voltage regulator unit 202 through the eleventh resistor R44. When a negative intermediate power supply is established at the input terminal IN2 of the negative voltage regulator unit 202, port EN2 can obtain the enable condition related to the input-side power supply state, enabling the negative voltage regulator unit 202 to enter the voltage regulation working state after the input power supply meets the working conditions.

[0071] Furthermore, port PG22 of the negative voltage regulator unit 202 is connected to one end of the third capacitor C27 through the twelfth resistor R47, enabling port PG22 to be connected to the input power supply node of the negative voltage regulator unit 202 through the twelfth resistor R47. The twelfth resistor R47 can limit current and isolate between port PG2 and the input power supply node, preventing transient fluctuations of the input node from directly affecting port PG22, while enabling port PG22 to establish a correspondence with the input power supply state.

[0072] In the operation of this embodiment, after the output terminal VOUTN of the DC / DC converter 100 outputs a negative intermediate power supply, this negative intermediate power supply enters the input terminal IN2 of the negative voltage regulator unit 202 and is filtered on the input side by the third capacitor C27. Subsequently, the negative voltage regulator unit 202 regulates the input negative intermediate power supply and outputs a negative regulated power supply through the output terminal OUT2. The fourth capacitor C28 further smooths the negative regulated power supply at the output terminal OUT2, making the negative power supply rail more stable. At the same time, the output terminal OUT2 provides a feedback signal to the port PGFB2 through the ninth resistor R45 and the tenth resistor R50, enabling the negative voltage regulator unit 202 to obtain the output voltage status; the ports EN2 and PG22 are connected to the input side power supply node through the eleventh resistor R44 and the twelfth resistor R47, respectively, to meet the enable control and status connection requirements of the negative voltage regulator unit 202.

[0073] Furthermore, the negative voltage regulator unit 202 and the positive voltage regulator unit 201 perform secondary voltage regulation on the negative and positive outputs of the DC / DC converter 100, respectively, enabling the voltage conversion circuit to form corresponding positive and negative regulated power supply rails. These positive and negative power supply rails can provide a stable bipolar power supply foundation for the subsequent differential amplifier or analog signal processing circuit, reducing the impact of power supply fluctuations on signal amplification, signal conditioning, and high-speed transmission.

[0074] The remaining structure is the same as that in Example 3.

[0075] Example 5, refer to Figures 6-8 This is the fifth embodiment of the present invention. The difference between this embodiment and the fourth embodiment is that a DC front-end board is provided, including a voltage conversion circuit and several differential amplifiers 300. The power supply terminal VS+ of the differential amplifiers 300 is connected to the output terminal OUT1 of the positive voltage regulator unit 201; the power supply terminal VS- of the differential amplifiers 300 is connected to the output terminal OUT2 of the negative voltage regulator unit 202.

[0076] The differential amplifier 300 has its port IN+ and port IN- connected to the thirteenth resistor R91 and the fourteenth resistor R92, respectively; the differential amplifier 300 has its port FB- connected to its port IN+ through the fifteenth resistor R89, and its port FB+ connected to its port IN- through the sixteenth resistor R93.

[0077] The OUT+ port of differential amplifier 300 is connected to the input terminal of output interface J3 through the seventeenth resistor R90, and the OUT- port of differential amplifier 300 is grounded through the eighteenth resistor R96.

[0078] It also includes several terminal blocks 400, each including a composite terminal 401 and a power supply terminal 402. The A30 and B30 pins of the composite terminal 401 are both connected to an external 12V power supply. The composite terminal 401 includes differential signal pairs composed of signal pins B03 and B06, B09 and B12, B15 and B18, and B21 and B24, each of which is electrically connected to an external signal source. The E01 and F01 pins of the power supply terminal 402 are both connected to an external 12V power supply.

[0079] Furthermore, both the E01 and F01 pins of power supply terminal 402 are connected to an external 12V power supply. Power supply terminal 402 can serve as another input path or an enhanced power supply path for the external 12V power supply, and works in conjunction with the A30 and B30 pins of composite terminal 401 to improve the reliability and current carrying capacity of the external 12V power supply to the DC front-end board.

[0080] In this embodiment, during operation, an external 12V power supply is connected to the DC front-end board via pins A30 and B30 of composite terminal 401 and pins E01 and F01 of power supply terminal 402, and then enters the voltage conversion circuit. The voltage conversion circuit filters, performs DC / DC conversion, and regulates the external 12V power supply to form a positive regulated power supply and a negative regulated power supply, which are supplied to the power supply terminals VS+ and VS- of differential amplifier 300 through the output terminal OUT1 of positive voltage regulator unit 201 and the output terminal OUT2 of negative voltage regulator unit 202, respectively. At the same time, multiple differential signals output from an external signal source enter the DC front-end board through differential signal pairs such as ports B03 / B06, B09 / B12, B15 / B18, and B21 / B24 in composite terminal 401, and are transmitted to the corresponding input terminals IN+ and IN- of differential amplifier 300. Differential amplifier 300 amplifies and conditions the differential signal under stable positive and negative power supply conditions, and finally outputs it to the subsequent circuit through port OUT+, the seventeenth resistor R90 and output interface J3.

[0081] Therefore, this embodiment combines the voltage conversion circuit, differential amplifier 300, composite terminal 401, power supply terminal 402, and output interface J3 to form a complete DC front-end board structure. This DC front-end board can provide stable positive and negative power to the differential amplifier 300 using the voltage conversion circuit, and introduce multiple differential signals through the composite terminal 401. The differential amplifier 300 then amplifies, conditions, and outputs the signals, thereby constructing a stable high-speed signal transmission channel. Since the power supply to the differential amplifier 300 undergoes pre-stage filtering and positive / negative voltage regulation, the impact of power supply fluctuations on the differential signal conditioning process can be reduced, improving signal transmission stability, waveform consistency, and the reliability of subsequent drive stages.

[0082] The remaining structure is the same as that in Example 4.

[0083] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0084] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0085] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A voltage conversion circuit, characterized in that, include: A DC / DC converter (100) has its input terminal electrically connected to an external 12V power supply via a filter (101); and, A voltage regulator unit (200) includes a positive voltage regulator unit (201) and a negative voltage regulator unit (202) connected in parallel. The output terminal VOUTP of the DC / DC converter (100) is electrically connected to the input terminal of the positive voltage regulator (201), and the output terminal VOUTN of the DC / DC converter (100) is electrically connected to the input terminal of the negative voltage regulator (202). The input port of the filter (101) is connected to a first filter inductor (FB1), and the start-up terminal of the DC / DC converter (100) is connected between the first filter inductor (FB1) and the input terminal of the filter (101).

2. The voltage conversion circuit according to claim 1, characterized in that: The power supply ground terminal of the filter (101) is connected to a second filter inductor (FB2).

3. The voltage conversion circuit according to claim 1 or 2, characterized in that: The port PG11 of the DC / DC converter (100) is connected to the first resistor (R16), the port PG21 of the DC / DC converter (100) is connected to the second resistor (R17), the first resistor (R16) and the second resistor (R17) are both connected to the input port of the filter (101), and each input pin of the ports VIN1 and VIN2 of the DC / DC converter (100) is connected to the output terminal of the filter (101). A third resistor (R2) and a fourth resistor (R7) are connected in series between the ports VIN1 and VIN2 of the DC / DC converter (100) and ground, and the port RUN1 of the DC / DC converter (100) is connected between the third resistor (R2) and the fourth resistor (R7) through the nineteenth resistor (R4). The RUN2 port of the DC / DC converter (100) is connected between the third resistor (R2) and the fourth resistor (R7) through the twentieth resistor (R8).

4. The voltage conversion circuit according to claim 3, characterized in that: The input terminal IN1 of the positive voltage regulator unit (201) is connected to one end of the first capacitor (C26), and the output terminal OUT1 of the positive voltage regulator unit (201) is connected to the second capacitor (C25), and the other ends of the first capacitor (C26) and the second capacitor (C25) are both grounded; The port PGFB1 of the positive voltage regulator unit (201) is connected to the output terminal OUT1 through the fifth resistor (R42), and the port PGFB1 of the positive voltage regulator unit (201) is grounded through the sixth resistor (R46). The positive voltage regulator unit (201) has its port EN1 connected to one end of the first capacitor (C26) via a seventh resistor (R41), and its port PG12 connected to one end of the first capacitor (C26) via an eighth resistor (R43).

5. The voltage conversion circuit according to any one of claims 1, 2, and 4, characterized in that: The input terminal IN2 of the negative voltage regulator unit (202) is connected to one end of the third capacitor (C27), and the output terminal OUT2 of the negative voltage regulator unit (202) is connected to one end of the fourth capacitor (C28), and the other ends of the third capacitor (C27) and the fourth capacitor (C28) are both grounded; The port PGFB2 of the negative voltage regulator unit (202) is connected to the output terminal OUT2 through the ninth resistor (R45), and the port PGFB2 of the negative voltage regulator unit (202) is grounded through the tenth resistor (R50); The port EN2 of the negative voltage regulator unit (202) is connected to one end of the third capacitor (C27) through the eleventh resistor (R44), and the port PG22 of the negative voltage regulator unit (202) is connected to one end of the third capacitor (C27) through the twelfth resistor (R47).

6. A DC front-end board, characterized in that: Includes the voltage conversion circuit as described in any one of claims 1 to 5; It also includes several differential amplifiers (300), the power supply terminal VS+ of the differential amplifiers (300) is connected to the output terminal OUT1 of the positive voltage regulator unit (201); the power supply terminal VS- of the differential amplifiers (300) is connected to the output terminal OUT2 of the negative voltage regulator unit (202).

7. The DC front-end board according to claim 6, characterized in that: The differential amplifier (300) has its port IN+ and port IN- connected to the thirteenth resistor (R91) and the fourteenth resistor (R92), respectively. The port FB- of the differential amplifier (300) is connected to the port IN+ of the differential amplifier (300) through the fifteenth resistor (R89), and the port FB+ of the differential amplifier (300) is connected to the port IN- of the differential amplifier (300) through the sixteenth resistor (R93).

8. The DC front-end board according to claim 6 or 7, characterized in that: The OUT+ port of the differential amplifier (300) is connected to the input terminal of the output interface (J3) through the seventeenth resistor (R90), and the OUT- port of the differential amplifier (300) is grounded through the eighteenth resistor (R96).

9. The DC front-end board according to claim 8, characterized in that: It also includes several terminals (400), the terminals (400) including composite terminals (401) and power supply terminals (402), the A30 pin and B30 pin of the composite terminal (401) are both connected to an external 12V power supply; The composite terminal (401) includes differential signal pairs consisting of signal pins B03 and B06, signal pins B09 and B12, signal pins B15 and B18, and signal pins B21 and B24, and each of the differential signal pairs is electrically connected to an external signal source.

10. The DC front-end board according to claim 9, characterized in that: The E01 and F01 pins of the power supply terminal (402) are both connected to an external 12V power supply.

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