A negative voltage regulation control system

Abstract

The utility model discloses a kind of negative voltage regulation control systems, comprising: negative power supply circuit is used to generate negative voltage;Negative voltage regulation circuit is connected with negative power supply circuit, for the negative voltage generated by negative power supply circuit is adjusted;The input end of negative voltage detection circuit is connected with the negative voltage output end of negative power supply circuit, the output end of negative voltage detection circuit is connected with system control module, and negative voltage detection circuit is used to detect the negative voltage output by negative power supply circuit;Auxiliary regulation circuit is connected with negative power supply circuit, for assisting negative voltage regulation circuit to adjust the negative voltage generated by negative power supply circuit;System control module is connected in negative voltage regulation circuit and auxiliary regulation circuit, and receives the negative voltage output by negative power supply circuit detected by negative voltage detection circuit, for comparing the negative voltage output by negative power supply circuit with demand negative voltage.The utility model can realize the dynamic regulation of negative voltage, improve the output accuracy of negative voltage, reduce the output deviation of negative voltage.

Description

Technical Field

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

[0002] OLED displays are commonly used display components in the current field of automotive smart cockpit displays. OLED displays require a negative voltage for power supply, and their brightness is directly controlled by this negative voltage. Therefore, the brightness requirements of the OLED screen can be adapted by adjusting the magnitude of the negative voltage.

[0003] Existing technologies offer numerous methods for negative voltage regulation, primarily employing dedicated integrated chips. For example, the GQ2704 chip from Zhixin Technology controls the negative voltage output via serial communication. Its regulation process typically uses an internal constant current source to change the output negative voltage, and the output voltage regulation relies heavily on the chip's internal reference voltage. This lack of dynamic correction results in inconsistent output accuracy and significant deviations. Furthermore, dedicated integrated chips are generally expensive, increasing production costs. Utility Model Content

[0004] The purpose of this invention is to solve the problems of low accuracy and high production cost of negative voltage regulation in existing technologies. This invention provides a negative voltage regulation control system that can achieve dynamic regulation of negative voltage, improve output accuracy, and reduce output deviation; and it reduces costs by using separate modular circuits instead of dedicated integrated chips.

[0005] To solve the above-mentioned technical problems, this utility model discloses a negative voltage regulation and control system, including: a power supply, a negative power supply circuit, a negative voltage regulation circuit, a negative voltage detection circuit, an auxiliary regulation circuit, and a system control module. The negative power supply circuit, the negative voltage detection circuit, the auxiliary regulation circuit, and the system control module are all connected to the power supply.

[0006] A negative power supply circuit is used to generate a negative voltage;

[0007] The negative voltage regulation circuit is connected to the negative power supply circuit and is used to regulate the negative voltage generated by the negative power supply circuit.

[0008] The input terminal of the negative voltage detection circuit is connected to the negative voltage output terminal of the negative power supply circuit, and the output terminal of the negative voltage detection circuit is connected to the system control module. The negative voltage detection circuit is used to detect the negative voltage output by the negative power supply circuit.

[0009] The auxiliary adjustment circuit is connected to the negative voltage output terminal of the negative power supply circuit and is used to assist the negative voltage adjustment circuit in adjusting the negative voltage generated by the negative power supply circuit.

[0010] The system control module is connected to the negative voltage regulation circuit and the auxiliary regulation circuit, and receives the negative voltage output from the negative power supply circuit detected by the negative voltage detection circuit. The system control module compares the negative voltage output from the negative power supply circuit with the required negative voltage. When the absolute value of the negative voltage is greater than the absolute value of the required negative voltage, the system control module controls the negative voltage regulation circuit and the auxiliary regulation circuit to conduct; when the absolute value of the negative voltage is less than the required negative voltage, the system control module controls the negative voltage regulation circuit to conduct; when the difference between the absolute value of the negative voltage and the absolute value of the required negative voltage is within a preset error range, the system control module controls the negative voltage regulation circuit and the auxiliary regulation circuit to close.

[0011] According to another specific embodiment of the present invention, a negative voltage regulation circuit is disclosed, comprising a first filter circuit, a third resistor and a first isolation circuit. The first filter circuit is connected to the PWM signal output terminal of the system control module, the output terminal of the first filter circuit is connected to one end of the third resistor, and the other end of the third resistor is connected to the first isolation circuit.

[0012] According to another specific embodiment of the present invention, a first filter circuit is disclosed, comprising a first resistor, a second resistor, a first capacitor, and a second capacitor. One end of the first resistor is connected to the PWM signal output terminal of the system control module, the other end of the first resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded. One end of the second resistor is connected to the common terminal of the first resistor and the first capacitor, the other end of the second resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded.

[0013] According to another specific embodiment of the present invention, a first filter circuit is disclosed, which further includes a fourth resistor and a third capacitor. One end of the fourth resistor is connected to the common terminal of the second resistor and the second capacitor, one end of the third capacitor is connected to the other end of the fourth resistor, and the other end of the third capacitor is grounded.

[0014] According to another specific embodiment of the present invention, a first isolation circuit is disclosed, including a first PNP transistor, the emitter of the first PNP transistor is connected to the other end of a third resistor, the collector of the first PNP transistor is connected to a negative power supply circuit, and the base of the first PNP transistor is grounded.

[0015] According to another specific embodiment of the present invention, a negative voltage detection circuit is disclosed, comprising an enable circuit, a second isolation circuit, an operational amplifier circuit, a second filter circuit, and a sampling circuit; wherein,

[0016] The enable circuit includes a fifth resistor, a sixth resistor, and an NPN transistor; the base of the NPN transistor is connected to the first enable output terminal of the system control module through the fifth resistor, the collector of the NPN transistor is connected to the second isolation circuit through the sixth resistor, and the emitter of the NPN transistor is grounded.

[0017] The second isolation circuit includes a seventh resistor, an eighth resistor, and a second PNP transistor. The emitter of the second PNP transistor is connected to the power supply through the seventh resistor. The base of the second PNP transistor is connected to the sixth resistor. The collector of the second PNP transistor is connected to the operational amplifier circuit. The two ends of the eighth resistor are connected to the emitter of the second PNP transistor and the base of the second PNP transistor, respectively.

[0018] The operational amplifier circuit includes an amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, and a fourth capacitor. The non-inverting input of the amplifier is grounded through the ninth resistor, and the inverting input of the amplifier is connected to the collector of the second PNP transistor through the tenth resistor. The two ends of the eleventh resistor are connected to the non-inverting input and the output of the amplifier, respectively. The positive power supply of the amplifier is connected to the power supply, and the negative power supply of the amplifier is grounded. The output of the amplifier is connected to the second filter circuit. One end of the fourth capacitor is connected to the positive power supply of the amplifier, and the other end of the fourth capacitor is grounded.

[0019] The second filter circuit includes a twelfth resistor, a thirteenth resistor, and a fifth capacitor. One end of the twelfth resistor is connected to the output terminal of the amplifier and the common terminal of the eleventh resistor. The other end of the twelfth resistor is connected to one end of the fifth capacitor. The other end of the fifth capacitor is grounded. The common terminal of the twelfth resistor and the fifth capacitor is connected to the negative voltage detection input terminal of the system control module through the thirteenth resistor.

[0020] The sampling circuit includes a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor. The first end of the fourteenth resistor serves as the input terminal of the sampling circuit and is connected to the negative voltage output terminal of the negative power supply circuit. The second end of the fourteenth resistor is connected to the first end of the fifteenth resistor. The second end of the fifteenth resistor is grounded. The first end of the fifteenth resistor serves as the output terminal of the sampling circuit and is connected to the inverting input terminal of the amplifier through the sixteenth resistor.

[0021] According to another specific embodiment of the present invention, an auxiliary adjustment circuit is disclosed, comprising a seventeenth resistor, a current-limiting resistor, a first discharge resistor, a second discharge resistor, a first PMOS transistor, and a second PMOS transistor. The gate of the first PMOS transistor is connected to the second enable output terminal of the system control module through the seventeenth resistor. The source of the first PMOS transistor is connected to the power supply. The drain of the first PMOS transistor is connected to one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected to the negative voltage output terminal of the negative power supply circuit. The gate of the second PMOS transistor is connected to one end of the current-limiting resistor, and the source of the second PMOS transistor is grounded. One end of the first discharge resistor and one end of the second discharge resistor are both connected to the drain of the second PMOS transistor. The other ends of the first discharge resistor and the other ends of the second discharge resistor are both connected to the negative voltage output terminal of the negative power supply circuit.

[0022] According to another specific embodiment of this utility model, this embodiment discloses a negative power supply circuit that includes at least a negative voltage chip, an inductor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first feedback resistor, and a second feedback resistor; wherein,

[0023] The switching pin of the negative voltage chip is connected to one end of the inductor, and the other end of the inductor is grounded.

[0024] The power input terminal of the negative voltage chip is connected to the power supply.

[0025] One end of the sixth, seventh, eighth, ninth, and tenth capacitors is connected to the negative voltage output terminal of the negative power supply circuit, and the other end of the sixth, seventh, eighth, ninth, and tenth capacitors is grounded.

[0026] One end of the first feedback resistor is connected to the feedback control terminal of the negative voltage chip, and the other end of the first feedback resistor is grounded. One end of the second feedback resistor is connected to the feedback control terminal of the negative voltage chip, and the other end of the second feedback resistor is connected to the negative voltage output terminal of the negative power supply circuit. The common terminal of the first feedback resistor and the second feedback resistor is connected to the output terminal of the negative voltage regulation circuit.

[0027] According to another specific embodiment of the present invention, the present invention discloses a negative voltage regulation and control system that further includes a serial communication interface for receiving the required negative voltage and transmitting the required negative voltage to the system control module.

[0028] Compared with the prior art, this utility model has the following beneficial effects:

[0029] This utility model discloses a negative voltage regulation and control system, comprising a negative power supply circuit, a negative voltage regulation circuit, a negative voltage detection circuit, an auxiliary regulation circuit, and a system control module. The negative voltage detection circuit detects the negative voltage output by the negative power supply circuit and feeds it back to the system control module. The system control module compares the absolute value of the current negative voltage output by the negative power supply circuit with the absolute value of the required negative voltage to determine whether adjustment of the current negative voltage output by the negative power supply circuit is necessary, thereby controlling the conduction or shutdown of the negative voltage regulation circuit and the auxiliary regulation circuit. Using the negative voltage regulation and control system provided in this application, the negative voltage output by the negative power supply circuit can be collected and fed back in real time during the negative voltage regulation process, thus achieving dynamic adjustment of the negative voltage, improving the output accuracy of the negative voltage, reducing the output deviation of the negative voltage, and significantly reducing costs by building separate modular circuits instead of dedicated integrated chips. Furthermore, the design of the auxiliary regulation circuit can shorten the negative voltage regulation cycle and improve the negative voltage regulation efficiency. Attached Figure Description

[0030] Figure 1 This diagram illustrates a block diagram of a negative voltage regulation control system provided in a specific embodiment of the present invention.

[0031] Figure 2 A block diagram of a negative voltage regulation circuit provided in a specific embodiment of the present invention is shown;

[0032] Figure 3 The circuit diagram of a negative voltage regulation circuit provided in a specific embodiment of the present invention is shown.

[0033] Figure 4 A circuit diagram of a negative voltage regulation circuit provided in another specific embodiment of this utility model is shown;

[0034] Figure 5 This diagram shows a block diagram of a negative voltage detection circuit provided in a specific embodiment of the present invention;

[0035] Figure 6 The circuit diagram of a negative voltage detection circuit provided in a specific embodiment of the present invention is shown.

[0036] Figure 7 The circuit diagram of the auxiliary adjustment circuit provided in a specific embodiment of the present invention is shown;

[0037] Figure 8 The diagram shows a circuit diagram of a negative power supply circuit provided in a specific embodiment of the present invention. Detailed Implementation

[0038] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0039] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0041] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0042] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0044] like Figure 1As shown, this utility model provides a negative voltage regulation and control system, including: a power supply 1, a negative power supply circuit 2, a negative voltage regulation circuit 3, a negative voltage detection circuit 4, an auxiliary regulation circuit 5, and a system control module 6. The negative power supply circuit 2, negative voltage detection circuit 4, auxiliary regulation circuit 5, and system control module 6 are all connected to the power supply 1. The negative power supply circuit 2 generates a negative voltage. The negative voltage regulation circuit 3 is connected to the negative power supply circuit 2 and regulates the negative voltage generated by the negative power supply circuit 2. The input terminal of the negative voltage detection circuit 4 is connected to the negative voltage output terminal S1 of the negative power supply circuit 2, and the output terminal of the negative voltage detection circuit 4 is connected to the system control module 6. The negative voltage detection circuit 4 detects the negative voltage output by the negative power supply circuit 2. The auxiliary regulation circuit 5 is connected to the negative voltage output terminal S1 of the negative power supply circuit 2 and assists the negative voltage regulation circuit 3 in regulating the negative voltage generated by the negative power supply circuit 2. The system control module 6 is connected to the negative voltage regulation circuit 3 and the auxiliary regulation circuit 5, and receives the negative voltage output by the negative power supply circuit 2 detected by the negative voltage detection circuit 4. The system control module 6 is used to compare the negative voltage output by the negative power supply circuit 2 with the required negative voltage. When the absolute value of the negative voltage is greater than the absolute value of the required negative voltage, the system control module 6 controls the negative voltage regulation circuit 3 and the auxiliary regulation circuit 5 to be turned on; when the absolute value of the negative voltage is less than the required negative voltage, the system control module 6 controls the negative voltage regulation circuit 3 to be turned on; when the difference between the absolute value of the negative voltage and the absolute value of the required negative voltage is within the preset error range, the system control module 6 controls the negative voltage regulation circuit 3 and the auxiliary regulation circuit 5 to be turned off.

[0045] It should be noted that the preset error range can be set according to the actual usage, and the specific size of the preset error range is not limited in this application.

[0046] To address the problems existing in current negative voltage regulation, this application's solution uses a negative voltage detection circuit 4 to detect the negative voltage output by the negative power supply circuit 2 and feeds it back to the system control module 6. The system control module 6 compares the absolute value of the current negative voltage output by the negative power supply circuit 2 with the absolute value of the required negative voltage to determine whether adjustment of the current negative voltage output by the negative power supply circuit 2 is necessary, thereby controlling the conduction or shutdown of the negative voltage regulation circuit 3 and the auxiliary regulation circuit 5. Using the negative voltage regulation control system provided in this application, the negative voltage output by the negative power supply circuit 2 can be collected and fed back in real time during the negative voltage regulation process, thus achieving dynamic adjustment of the negative voltage, improving the output accuracy of the negative voltage, reducing the output deviation of the negative voltage, and significantly reducing costs by building separate modular circuits instead of dedicated integrated chips. Furthermore, the design of the auxiliary regulation circuit 5 can shorten the negative voltage regulation cycle and improve the negative voltage regulation efficiency.

[0047] In some implementations, reference Figure 2The negative voltage regulation circuit 3 includes a first filter circuit 31, a third resistor R3, and a first isolation circuit 32. The first filter circuit 31 is connected to the PWM signal output terminal S2 of the system control module 6. The output terminal of the first filter circuit 31 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the first isolation circuit 32. The first isolation circuit 32 is connected to the negative power supply circuit 2 through the negative voltage regulation feedback terminal S6. Specifically, the third resistor R3 converts the steady-state voltage output by the first filter circuit 31 into a constant steady-state current and injects this constant steady-state current into the negative power supply circuit 2. This steady-state current determines the output value of the negative voltage regulation circuit 3. The third resistor R3 can be a high-precision resistor, and the operator can adjust the precision of the third resistor R3 according to the actual situation to match the output range of the negative voltage.

[0048] According to the embodiments of this application, refer to Figure 3 The first filter circuit 31 includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. One end of the first resistor R1 is connected to the PWM signal output terminal S2 of the system control module 6, and the other end is connected to one end of the first capacitor C1, with the other end of the first capacitor C1 grounded. One end of the second resistor R2 is connected to the common terminal of the first resistor R1 and the first capacitor C1, and the other end is connected to one end of the second capacitor C2, with the other end of the second capacitor C2 grounded. The PWM signal output by the system control module 6 is rectified and filtered by the first filter circuit 31, converting the PWM signal into a stable DC voltage. The magnitude of the DC voltage is determined by the high level of the PWM signal and the duty cycle of the PWM signal.

[0049] Specifically, the system control module 6 can be a digital processor such as FPGA, ARM, MCU, or DSP, and the output I / O port of the system control module 6 is a PWM logic signal with an adjustable high-level duty cycle.

[0050] It should be noted that, considering the influence of the system's working environment, the first filter circuit 31 can be designed as a second-order filter or a third-order filter.

[0051] Therefore, according to the embodiments of this application, reference is made to... Figure 4 The first filter circuit 31 may further include a fourth resistor R4 and a third capacitor C3. One end of the fourth resistor R4 is connected to the common terminal of the second resistor R2 and the second capacitor C2, and one end of the third capacitor C3 is connected to the other end of the fourth resistor R4. The other end of the third capacitor C3 is grounded. This third-order filter design ensures a more stable output voltage value, improving the system's stability and accuracy.

[0052] In some implementations, such as Figure 3 and 4As shown, the first isolation circuit 32 includes a first PNP transistor Q1. The emitter of the first PNP transistor Q1 is connected to the other end of the third resistor R3, the collector of the first PNP transistor Q1 is connected to the negative power supply circuit 2 through the negative voltage regulation feedback terminal S6, and the base of the first PNP transistor Q1 is grounded. The negative voltage output of the negative power supply circuit 2 is regulated by controlling the conduction and cutoff states of the first PNP transistor Q1. When the PWM signal output by the system control module 6 is processed by the first filter circuit 31, it controls the conduction level of the first PNP transistor Q1, thereby changing the operating state of the negative power supply circuit 2 and regulating the negative voltage. Furthermore, the first isolation circuit 32 provides electrical isolation, preventing mutual interference between different circuits.

[0053] According to the embodiments of this application, refer to Figure 5 and Figure 6 The negative voltage detection circuit 4 includes an enable circuit 41, a second isolation circuit 42, an operational amplifier circuit 43, a second filter circuit 44, and a sampling circuit 45.

[0054] Specifically, the enabling circuit 41 includes a fifth resistor R5, a sixth resistor R6, and an NPN transistor Q2. The base of the NPN transistor Q2 is connected to the first enable output terminal S3 of the system control module 6 through the fifth resistor R5, the collector of the NPN transistor Q2 is connected to the second isolation circuit 42 through the sixth resistor R6, and the emitter of the NPN transistor Q2 is grounded. The system control module 6 controls the conduction and cutoff of the NPN transistor Q2 through the first enable output terminal S3, thereby enabling the negative voltage detection circuit 4. When negative voltage needs to be detected, the system control module 6 outputs a high-level signal, turning on the NPN transistor Q2 and starting the negative voltage detection circuit 4; when detection is not needed, the system control module 6 outputs a low-level signal, turning off the NPN transistor Q2 and stopping the negative voltage detection circuit 4 to reduce system power consumption.

[0055] The second isolation circuit 42 includes a seventh resistor R7, an eighth resistor R8, and a second PNP transistor Q3. The emitter of the second PNP transistor Q3 is connected to the VDD terminal of the power supply 1 through the seventh resistor R7. The base of the second PNP transistor Q3 is connected to the sixth resistor R6. The collector of the second PNP transistor Q3 is connected to the operational amplifier circuit 43. The two ends of the eighth resistor R8 are connected to the emitter and base of the second PNP transistor Q3, respectively. The second isolation circuit 42 is used to isolate the enable circuit 41 and the operational amplifier circuit 43 to prevent mutual interference between them, and also serves as a signal amplification and buffer.

[0056] The sampling circuit 45 includes a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor R16. The first end of the fourteenth resistor R14 serves as the input terminal of the sampling circuit 45 and is connected to the negative voltage output terminal S1 of the negative power supply circuit 2. The second end of the fourteenth resistor R14 is connected to the first end of the fifteenth resistor R15, and the second end of the fifteenth resistor R15 is grounded. The first end of the fifteenth resistor R15 serves as the output terminal of the sampling circuit 45 and is connected to the inverting input terminal of the amplifier U1 via the sixteenth resistor R16. The sampling circuit 45 performs voltage division sampling on the negative voltage output from the negative power supply circuit 2 using the fourteenth and fifteenth resistors R14 and R15, and transmits the sampled negative voltage signal to the operational amplifier circuit 43 for amplification.

[0057] The operational amplifier circuit 43 includes amplifier U1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a fourth capacitor C4. The non-inverting input of amplifier U1 is grounded through the ninth resistor R9, and the inverting input of amplifier U1 is connected to the collector of the second PNP transistor Q3 through the tenth resistor R10. The two ends of the eleventh resistor R11 are connected to the non-inverting input and the output of amplifier U1, respectively. The positive power supply of amplifier U1 is connected to power supply 1, and the negative power supply of amplifier U1 is grounded. The output of amplifier U1 is connected to the second filter circuit 44. One end of the fourth capacitor C4 is connected to the positive power supply of amplifier U1, and the other end of the fourth capacitor C4 is grounded. The operational amplifier circuit 43 amplifies the negative voltage signal acquired by the sampling circuit 45, increasing the signal amplitude for subsequent detection and analysis.

[0058] The second filter circuit 44 includes a twelfth resistor R12, a thirteenth resistor R13, and a fifth capacitor C5. One end of the twelfth resistor R12 is connected to the common terminal of the output terminal of amplifier U1 and the eleventh resistor R11. The other end of the twelfth resistor R12 is connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is grounded. The common terminal of the twelfth resistor R12 and the fifth capacitor C5 is connected to the negative voltage detection input terminal S4 of the system control module 6 through the thirteenth resistor R13. The second filter circuit 44 further filters the signal output by the operational amplifier circuit 43, removing residual noise and interference from the signal to ensure that the negative voltage signal received by the system control module 6 is accurate and reliable.

[0059] According to the embodiments of this application, refer to Figure 7The auxiliary adjustment circuit 5 includes a seventeenth resistor R17, a current-limiting resistor R18, a first discharge resistor R19, a second discharge resistor R20, a first PMOS transistor P1, and a second PMOS transistor P2. The gate of the first PMOS transistor P1 is connected to the second enable output terminal S5 of the system control module 6 through the seventeenth resistor R17. The source of the first PMOS transistor P1 is connected to the VDD terminal of the power supply 1, and the drain of the first PMOS transistor P1 is connected to one end of the current-limiting resistor R18. The system control module 6 controls the conduction and cutoff of the first PMOS transistor P1 through the second enable output terminal S5. When the auxiliary adjustment circuit 5 needs to adjust the negative voltage, the system control module 6 outputs a high-level signal to turn on the first PMOS transistor P1. The power supply 1 provides additional current to the negative power supply circuit 2 through the first PMOS transistor P1 and the current-limiting resistor R18, assisting the negative voltage adjustment circuit 3 in adjusting the negative voltage. The other end of the current-limiting resistor R18 is connected to the negative voltage output terminal S1 of the negative power supply circuit 2, serving to limit the current and prevent excessive current from damaging the circuit components. The gate of the second PMOS transistor P2 is connected to one end of the current-limiting resistor R18, and the source of the second PMOS transistor P2 is grounded. One end of the first discharge resistor R19 and one end of the second discharge resistor R20 are both connected to the drain of the second PMOS transistor P2. The other ends of the first discharge resistor R19 and the second discharge resistor R20 are both connected to the negative voltage output terminal S1 of the negative power supply circuit 2. When the first PMOS transistor P1 is turned on, a high-level signal is input to the gate of the second PMOS transistor, causing the second PMOS transistor P2 to turn on. The negative voltage output by the negative power supply circuit 2 is discharged through the first discharge resistor R19 and the second discharge resistor R20, which quickly reduces the absolute value of the negative voltage, so that the negative voltage output by the negative power supply circuit 2 quickly approaches the required negative voltage, thereby shortening the adjustment cycle of the negative voltage and improving the adjustment efficiency.

[0060] It should be noted that the discharge resistors include, but are not limited to, the first discharge resistor R19 and the second discharge resistor R20. Operators can select their quantity, resistance value and connection method according to the actual use.

[0061] Optionally, refer to Figure 8 The negative power supply circuit 2 includes at least a negative voltage chip U2, an inductor L1, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a first feedback resistor R21, and a second feedback resistor R22.

[0062] Specifically, the negative voltage chip U2, as the core component of the negative power supply circuit 2, has its switching pin SW connected to one end of the inductor L1, generating a negative voltage by controlling the switching action. The power input terminals VIN1 and VIN2 are connected to the VDD terminal of the power supply 1 to obtain the necessary power. The other end of the inductor L1 is grounded, serving as energy storage and filtering during the switching action of the negative voltage chip U2, thus helping to stabilize the negative voltage output. One end of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are all connected to the negative voltage output terminal S1 of the negative power supply circuit 2, and the other end is grounded. These capacitors are used to filter and stabilize the negative voltage, reducing voltage fluctuations and noise, and improving the stability of the output voltage. One end of the first feedback resistor R21 is connected to the feedback control terminal FB of the negative voltage chip U2, and the other end is grounded; one end of the second feedback resistor R22 is connected to the feedback control terminal FB of the negative voltage chip U2, and the other end is connected to the negative voltage output terminal S1 of the negative power supply circuit 2. The common terminal of the first feedback resistor R21 and the second feedback resistor R22 is connected to the output terminal of the negative voltage regulation circuit 3. Through these two feedback resistors, the negative voltage chip U2 can adjust its switching action according to the feedback signal, thereby achieving preliminary regulation of the negative voltage output.

[0063] In some implementations, such as Figure 1 As shown, the negative voltage regulation and control system also includes a serial communication interface 7, used to receive the required negative voltage and transmit it to the system control module 6. Through the serial communication interface 7, users can flexibly select and set the magnitude of the required negative voltage according to actual needs, improving the system's versatility and practicality.

[0064] It should be noted that the serial communication interface 7 can use common communication protocols, such as UART, I2C, SPI, etc., to facilitate data interaction with external load devices.

[0065] Specifically, after the system is powered on, power supply 1 supplies power to each circuit module, and system control module 6 initializes. Negative power supply circuit 2 receives an enable signal, starts operating, and outputs an initial negative voltage value. External load devices transmit their required negative voltage to system control module 6 via serial communication interface 7. Negative voltage detection circuit 4 starts operating under the control of enable circuit 41. Sampling circuit 45 samples the negative voltage output by negative power supply circuit 2, amplifies it through operational amplifier circuit 43, and filters it through second filter circuit 44 before transmitting the detected negative voltage signal to system control module 6. System control module 6 compares the detected negative voltage with the required negative voltage. When the absolute value of the negative voltage is greater than the absolute value of the required negative voltage, system control module 6 controls negative voltage adjustment circuit 3 and auxiliary adjustment circuit 5 to conduct. The negative voltage regulation circuit 3 filters the PWM signal output by the system control module through the first filter circuit 31, and the first isolation circuit 32 transmits the PWM signal to the negative power supply circuit 2 to regulate the negative voltage output of the negative power supply circuit 2. The auxiliary regulation circuit 5, through the coordinated operation of the first PMOS transistor P1 and the second PMOS transistor P2, and using the first discharge resistor R19 and the second discharge resistor R20, discharges the negative voltage output by the negative power supply circuit 2, rapidly reducing the absolute value of the negative voltage so that the negative voltage output by the negative power supply circuit 2 quickly approaches the required negative voltage. When the absolute value of the negative voltage is less than the absolute value of the required negative voltage, the system control module 6 controls the negative voltage regulation circuit 3 to turn on and the auxiliary regulation circuit 5 to turn off. The negative voltage regulation circuit 3 adjusts the output of the negative power supply circuit 2, so that the absolute value of the negative voltage gradually increases until it meets the required negative voltage. When the difference between the absolute value of the negative voltage and the absolute value of the required negative voltage is within the preset error range, the current PWM signal output is maintained. During the adjustment process, the negative voltage detection circuit 4 detects the negative voltage in real time and feeds back the detection results to the system control module 6. The system control module 6 continuously adjusts the working state of the negative voltage adjustment circuit 3 and the auxiliary adjustment circuit 5 according to the feedback information until the negative voltage reaches the required negative voltage, thereby realizing the dynamic adjustment of the negative voltage.

[0066] Thus, the negative voltage regulation and control system provided in this application can collect and feedback the negative voltage output by the negative power supply circuit in real time, realize the dynamic regulation of the negative voltage, improve the output accuracy of the negative voltage, reduce the output deviation, shorten the regulation cycle of the negative voltage, and improve the regulation efficiency; and by building separate modular circuits to replace dedicated integrated chips, the cost is significantly reduced.

[0067] It should be noted that the unit modules mentioned in the various device embodiments of this utility model are all logical unit modules. Physically, a logical unit module can be a physical unit module, a part of a physical unit module, or a combination of multiple physical unit modules. The physical implementation of these logical unit modules themselves is not the most important factor; the combination of functions implemented by these logical unit modules is the key to solving the technical problem proposed in this application. Furthermore, to highlight the innovative aspects of this application, the above-mentioned device embodiments of this utility model have not introduced unit modules that are not closely related to solving the technical problem proposed in this utility model. This does not mean that the above-mentioned device embodiments do not contain other unit modules.

[0068] It should be noted that in the examples and description of this utility model, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0069] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A negative voltage regulation and control system, characterized in that, include: The system includes a power supply, a negative power supply circuit, a negative voltage regulation circuit, a negative voltage detection circuit, an auxiliary regulation circuit, and a system control module. The negative power supply circuit, the negative voltage detection circuit, the auxiliary regulation circuit, and the system control module are all connected to the power supply. The negative power supply circuit is used to generate a negative voltage; The negative voltage regulation circuit is connected to the negative power supply circuit and is used to regulate the negative voltage generated by the negative power supply circuit. The input terminal of the negative voltage detection circuit is connected to the negative voltage output terminal of the negative power supply circuit, and the output terminal of the negative voltage detection circuit is connected to the system control module. The negative voltage detection circuit is used to detect the negative voltage output by the negative power supply circuit. The auxiliary adjustment circuit is connected to the negative voltage output terminal of the negative power supply circuit, and is used to assist the negative voltage adjustment circuit in adjusting the negative voltage generated by the negative power supply circuit. The system control module is connected to the negative voltage regulation circuit and the auxiliary regulation circuit, and receives the negative voltage output by the negative power supply circuit detected by the negative voltage detection circuit. The system control module is used to compare the negative voltage output by the negative power supply circuit with the required negative voltage, and when the absolute value of the negative voltage is greater than the absolute value of the required negative voltage, control the negative voltage regulation circuit and the auxiliary regulation circuit to be turned on; when the absolute value of the negative voltage is less than the required negative voltage, control the negative voltage regulation circuit to be turned on; when the difference between the absolute value of the negative voltage and the absolute value of the required negative voltage is within a preset error range, control the negative voltage regulation circuit and the auxiliary regulation circuit to be turned off.

2. The negative voltage regulation control system as described in claim 1, characterized in that, The negative voltage regulation circuit includes a first filter circuit, a third resistor, and a first isolation circuit. The first filter circuit is connected to the PWM signal output terminal of the system control module. The output terminal of the first filter circuit is connected to one end of the third resistor, and the other end of the third resistor is connected to the first isolation circuit.

3. The negative voltage regulation control system as described in claim 2, characterized in that, The first filter circuit includes a first resistor, a second resistor, a first capacitor, and a second capacitor. One end of the first resistor is connected to the PWM signal output terminal of the system control module, the other end of the first resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded. One end of the second resistor is connected to the common terminal of the first resistor and the first capacitor, the other end of the second resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded.

4. The negative voltage regulation control system as described in claim 3, characterized in that, The first filter circuit further includes a fourth resistor and a third capacitor. One end of the fourth resistor is connected to the common terminal of the second resistor and the second capacitor. One end of the third capacitor is connected to the other end of the fourth resistor, and the other end of the third capacitor is grounded.

5. The negative voltage regulation control system as described in any one of claims 3 or 4, characterized in that, The first isolation circuit includes a first PNP transistor, the emitter of the first PNP transistor is connected to the other end of the third resistor, the collector of the first PNP transistor is connected to the negative power supply circuit, and the base of the first PNP transistor is grounded.

6. The negative voltage regulation control system as described in claim 1, characterized in that, The negative voltage detection circuit includes an enable circuit, a second isolation circuit, an operational amplifier circuit, a second filter circuit, and a sampling circuit; wherein, The enabling circuit includes a fifth resistor, a sixth resistor, and an NPN transistor; the base of the NPN transistor is connected to the first enable output terminal of the system control module through the fifth resistor, the collector of the NPN transistor is connected to the second isolation circuit through the sixth resistor, and the emitter of the NPN transistor is grounded. The second isolation circuit includes a seventh resistor, an eighth resistor, and a second PNP transistor. The emitter of the second PNP transistor is connected to the power supply through the seventh resistor. The base of the second PNP transistor is connected to the sixth resistor. The collector of the second PNP transistor is connected to the operational amplifier circuit. The two ends of the eighth resistor are connected to the emitter and the base of the second PNP transistor, respectively. The operational amplifier circuit includes an amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, and a fourth capacitor. The non-inverting input terminal of the amplifier is grounded through the ninth resistor. The inverting input terminal of the amplifier is connected to the collector of the second PNP transistor through the tenth resistor. The two ends of the eleventh resistor are connected to the non-inverting input terminal and the output terminal of the amplifier, respectively. The positive power supply terminal of the amplifier is connected to the power supply, the negative power supply terminal of the amplifier is grounded, the output terminal of the amplifier is connected to the second filter circuit, one end of the fourth capacitor is connected to the positive power supply terminal of the amplifier, and the other end of the fourth capacitor is grounded. The second filter circuit includes a twelfth resistor, a thirteenth resistor, and a fifth capacitor. One end of the twelfth resistor is connected to the output terminal of the amplifier and the common terminal of the eleventh resistor. The other end of the twelfth resistor is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded. The common terminal of the twelfth resistor and the fifth capacitor is connected to the negative voltage detection input terminal of the system control module through the thirteenth resistor. The sampling circuit includes a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor. The first end of the fourteenth resistor serves as the input terminal of the sampling circuit and is connected to the negative voltage output terminal of the negative power supply circuit. The second end of the fourteenth resistor is connected to the first end of the fifteenth resistor. The second end of the fifteenth resistor is grounded. The first end of the fifteenth resistor serves as the output terminal of the sampling circuit and is connected to the inverting input terminal of the amplifier through the sixteenth resistor.

7. The negative voltage regulation control system as described in claim 1, characterized in that, The auxiliary adjustment circuit includes a seventeenth resistor, a current-limiting resistor, a first discharge resistor, a second discharge resistor, a first PMOS transistor, and a second PMOS transistor. The gate of the first PMOS transistor is connected to the second enable output terminal of the system control module through the seventeenth resistor. The source of the first PMOS transistor is connected to the power supply. The drain of the first PMOS transistor is connected to one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected to the negative voltage output terminal of the negative power supply circuit. The gate of the second PMOS transistor is connected to the first end of the current-limiting resistor, and the source of the second PMOS transistor is grounded. One end of both the first and second discharge resistors is connected to the drain of the second PMOS transistor, and the other ends of both the first and second discharge resistors are connected to the negative voltage output terminal of the negative power supply circuit.

8. The negative voltage regulation control system as described in claim 1, characterized in that, The negative power supply circuit includes at least a negative voltage chip, an inductor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first feedback resistor, and a second feedback resistor; wherein, The switching pin of the negative voltage chip is connected to one end of the inductor, and the other end of the inductor is grounded. The power input terminal of the negative pressure chip is connected to the power supply. One end of each of the sixth, seventh, eighth, ninth, and tenth capacitors is connected to the negative voltage output terminal of the negative power supply circuit, and the other end of each of the sixth, seventh, eighth, ninth, and tenth capacitors is grounded. One end of the first feedback resistor is connected to the feedback control terminal of the negative voltage chip, and the other end of the first feedback resistor is grounded. One end of the second feedback resistor is connected to the feedback control terminal of the negative voltage chip, and the other end of the second feedback resistor is connected to the negative voltage output terminal of the negative power supply circuit. The common terminal of the first feedback resistor and the second feedback resistor is connected to the output terminal of the negative voltage regulation circuit.

9. The negative voltage regulation control system as described in claim 1, characterized in that, It also includes a serial communication interface for receiving the required negative voltage and transmitting the required negative voltage to the system control module.

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