Power-on slope control circuit

Abstract

The utility model provides a power-on slope control circuit. The power-on slope control circuit comprises an input module, a slope control module and an output module, the input module is used for providing power supply voltage and transmitting the power supply voltage to the output module and the slope control module, the slope control module is used for controlling the power-on slope of the output module, and the output module is used for outputting voltage to a load under the control of the slope control module. The power-on slope control circuit solves the technical problem that a power-on slope control circuit in the prior art cannot accurately control the power-on slope due to resistance drop and capacitance nonlinearity.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, and more specifically to a power-on slope control circuit. Background Art

[0002] With the rapid development of science and technology, electronic products are becoming increasingly complex, with an ever-increasing variety of internal chips, and increasingly stringent requirements for power supplies. On the one hand, when the chips in electronic products are powered on, the power supply must not overshoot, otherwise it will damage the chip. On the other hand, there are clear requirements for the power supply's rise time, which must be neither too fast nor too slow. This urgently requires a power-on slope control circuit.

[0003] Existing technical solutions typically use an RC circuit consisting of a resistor and a capacitor for power-on slope control. However, this approach has significant drawbacks. Due to the presence of the resistor, when the current increases, a large voltage drop occurs across the resistor. This results in a low voltage reaching the chip, causing the chip to malfunction. While reducing the resistor can alleviate the voltage drop issue to some extent, it significantly reduces the control effectiveness, making it difficult to achieve effective power-on slope control.

[0004] The improved power-on slope control circuit is used in conjunction with a MOS transistor, controlling the MOS transistor's on-state voltage through an RC circuit, thereby controlling the MOS transistor's conduction effect. However, this solution also has limitations. The capacitor C in the RC circuit has nonlinear characteristics, which makes the MOS transistor's conduction nonlinear as well. This is not conducive to precise control of the power-on slope, so it can only be used in general applications and cannot meet the needs of complex electronic products with higher power requirements. Utility Model Content

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a power-on slope control circuit, which aims to solve the technical problem in the prior art that the power-on slope control circuit cannot accurately control the power-on slope due to the resistance voltage drop and the nonlinearity of the capacitor.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A power-on slope control circuit includes: an input module, a slope control module, and an output module; the input module is used to provide a power supply voltage and transmit it to the output module and the slope control module; the slope control module is used to control the power-on slope of the output module; and the output module is used to output a voltage to a load under the control of the slope control module.

[0008] In one embodiment, the slope control module includes a MOS tube unit, a forward input unit, a reverse input unit, an operational amplifier and control unit, and a gate control unit; the MOS tube unit is gradually turned on under the control of the operational amplifier and control unit, so that the voltage of the input module is conducted to the output module with a set slope; the forward input unit is used to enable the operational amplifier and control unit to receive the voltage change of the input module; the reverse input unit is used to enable the operational amplifier and control unit to receive the voltage change of the output module; the operational amplifier and control unit controls the output voltage according to the voltage difference between the forward input and the reverse input; and the gate control unit is used to control the conduction speed of the MOS tube unit.

[0009] In one embodiment, the MOS transistor unit includes a first MOS transistor M1 and a second MOS transistor M2 , and the first MOS transistor M1 and the second MOS transistor M2 work together to control the conduction between the input module and the output module.

[0010] In one embodiment, the gate of the MOS tube unit is connected to the gate control unit, the source of the MOS tube unit is connected to the power supply VIN of the input module, and the drain of the MOS tube unit is connected to the output module.

[0011] In one embodiment, the operational amplifier and control unit includes a first operational amplifier U1 and a first capacitor C1. The first operational amplifier U1 determines the output voltage according to the input voltage difference. The first capacitor C1 is used to compensate for the frequency response of the first operational amplifier U1.

[0012] In one embodiment, the positive input terminal IN+ of the first operational amplifier U1 is connected to the positive input unit, the negative input terminal IN- of the first operational amplifier U1 is connected to the negative input unit, and the output terminal of the first operational amplifier U1 is connected to the gate of the MOS tube unit.

[0013] In one embodiment, the first capacitor C1 is connected in parallel to the first operational amplifier U1 .

[0014] In one embodiment, the forward input unit includes a third resistor R3 and a fourth resistor R4. The third resistor R3 and the fourth resistor R4 divide the voltage of the input module and then input the voltage to the operational amplifier and control unit.

[0015] In one embodiment, the reverse input unit includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 and the sixth resistor R6 divide the voltage of the output module and then input the voltage to the operational amplifier and control unit.

[0016] In one embodiment, the gate control unit includes a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 control the gate voltage of the MOS tube unit to control the conduction speed of the MOS tube unit.

[0017] Compared to the prior art, the present invention offers the following advantages: The various components of the slope control module work in tandem, with the op amp and control unit generating a precise control signal based on changes in input voltage sensed by the forward input unit and output voltage sensed by the reverse input unit. This control signal acts on the gate of the MOS transistor unit, gradually turning it on under the control of the first op amp U1. This gradual conduction allows the voltage from the control input module to be transferred to the output module at a steady slope, rather than experiencing a sudden, rapid rise that could cause overshoot. This effectively prevents chip damage caused by power-on overshoot.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A circuit schematic diagram of a power-on slope control circuit provided by the utility model;

[0020] Figure 2 This is a circuit principle diagram of a slope control module of a power-on slope control circuit provided by the utility model.

[0021] Reference numerals

[0022] 10. Input module; 20. Slope control module; 201. MOS tube unit; 202. Forward input unit; 203. Reverse input unit; 204. Operational amplifier and control unit; 205. Gate control unit; 30. Output module. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0026] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0027] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] See also Figures 1 to 2 As shown, the utility model discloses a power-on slope control circuit, comprising: an input module 10, a slope control module 20 and an output module 30; the input module 10 is used to provide a power supply voltage and transmit it to the output module 30 and the slope control module 20, the slope control module 20 is used to control the power-on slope of the output module 30, and the output module 30 is used to output a voltage to a load under the control of the slope control module 20.

[0029] Specifically, the main function of the input module 10 is to provide power supply voltage and transmit the received power supply voltage to the output module 30 and the slope control module 20, acting as a bridge connecting the external power supply with other modules within the circuit. The slope control module 20 receives the power supply voltage from the input module 10 and processes it to control the power-on slope of the output module 30. By monitoring the voltage changes of the input and output, and utilizing specific electronic components and circuit structures, it accurately adjusts the conduction speed of the output module 30, thereby achieving control of the rising or falling slope of the power supply voltage. Under the control of the slope control module 20, the output module 30 outputs a stable voltage to the load. It will be understood that the load can be various electronic devices or circuit components, such as processor chips, memory chips, etc.

[0030] In one embodiment, the slope control module 20 includes a MOS tube unit 201, a forward input unit 202, a reverse input unit 203, an operational amplifier and control unit 204, and a gate control unit 205; the MOS tube unit 201 is gradually turned on under the control of the operational amplifier and control unit 204, so that the voltage of the input module 10 is conducted to the output module 30 with a set slope; the forward input unit 202 is used to enable the operational amplifier and control unit 204 to receive the voltage change of the input module 10; the reverse input unit 203 is used to enable the operational amplifier and control unit 204 to receive the voltage change of the output module 30; the operational amplifier and control unit 204 controls the output voltage according to the voltage difference between the forward input and the reverse input; and the gate control unit 205 is used to control the conduction speed of the MOS tube unit 201.

[0031] Specifically, the MOS transistor unit 201 is usually composed of one or more MOS transistors, which are gradually turned on under the control of the operational amplifier and control unit 204. It can be understood that the degree of conduction of the MOS transistor unit 201 can be precisely adjusted, rather than being completely turned on or off instantly. This gradual conduction method allows the voltage of the input module 10 to be conducted to the output module 30 at a set slope, thereby achieving control of the power-on slope. The forward input unit 202 is mainly composed of specific resistors and other components, which transmits the voltage change information of the input module 10 to the operational amplifier and control unit 204, so that the operational amplifier and control unit 204 can understand the state of the input voltage in real time and adjust the output control signal according to the change of the input voltage. The reverse input unit 203 usually includes specific resistors and other components, which feeds back the voltage change information of the output module 30 to the operational amplifier and control unit 204, so that the operational amplifier and control unit 204 can adjust the control strategy according to the change of the output voltage to achieve precise control of the output voltage. The operational amplifier and control unit 204 is mainly composed of operational amplifiers and related capacitors and other components. The output voltage is determined by the voltage difference between the forward and reverse inputs. By comparing the voltage changes between the input module 10 and the output module 30, the op amp generates a corresponding control signal to control the conduction state of the MOS transistor unit 201. The gate control unit 205, typically composed of specific components such as resistors, is used to control the conduction speed of the MOS transistor unit 201. By adjusting the gate voltage of the MOS transistor, the gate control unit 205 can change the conduction level of the MOS transistor, thereby affecting the power-up slope.

[0032] In one embodiment, the MOS transistor unit 201 includes a first MOS transistor M1 and a second MOS transistor M2 , and the first MOS transistor M1 and the second MOS transistor M2 work together to control the conduction between the input module 10 and the output module 30 .

[0033] Specifically, the MOS transistor unit 201 consists of a first MOS transistor M1 and a second MOS transistor M2. In the circuit, the MOS transistor acts as a switch. By adjusting the conduction state of M1 and M2 (i.e., M1 / M2), the input voltage can be controlled to be transmitted to the output module 30 at a specific slope, achieving precise control of the power-up slope, ensuring that the output module 30 can obtain power at an appropriate power-up slope, avoiding overshoot and meeting the power rise time requirements of specific devices. At the same time, by precisely controlling the conduction state, the efficiency and stability of the circuit can be improved, and energy loss and electromagnetic interference can be reduced.

[0034] In one embodiment, the gate of the MOS tube unit 201 is connected to the gate control unit 205 , the source of the MOS tube unit 201 is connected to the power supply VIN of the input module 10 , and the drain of the MOS tube unit 201 is connected to the output module 30 .

[0035] Specifically, the gate of the MOS transistor unit 201 is connected to the gate control unit 205, which regulates the conduction level of the MOS transistor unit 201 by controlling the gate voltage of the MOS transistor unit 201. The source of the MOS transistor unit 201 is connected to the power supply VIN of the input module 10. This means that the MOS transistor unit 201 receives power from the input module 10, and its conduction state determines whether the input voltage can be transmitted to the output module 30. When the MOS transistor unit 201 is turned on, a conductive path is formed between the source and drain, allowing the voltage of the input module 10 to be transmitted to the output module 30 through the MOS transistor unit 201. The drain of the MOS transistor unit 201 is connected to the output module 30. When the MOS transistor unit 201 is turned on, the voltage of the input module 10 is transmitted to the output module 30 through the conductive path between the source and drain, providing power for the output module 30. The drain is connected to the output module 30 so that the MOS tube unit 201 can directly control the power-on process of the output module 30 . By adjusting the conduction state of the MOS tube unit 201 , the power-on slope of the output module 30 can be controlled.

[0036] It is understandable that in the prior art, the power supply VIN (+5V) becomes the output voltage VOUT of the output module 30 after passing through the MOS tube unit 201 (M1 / M2), and the output voltage VOUT of the output module 30 will supply power to the load (chip). At the moment the power supply VIN is turned on, the voltage will rise rapidly from 0V. Due to the rapid rise rate, the voltage will not stop rising at 5V, but will continue to rise and will stabilize after a period of spring-like overshoot. Therefore, if the power supply VIN is directly used for the subsequent load, it may exceed the maximum supply voltage of the load and burn out. Even if it does not burn out, if the power-on time is incorrect, it may cause internal initialization or startup disorder of the load and cause the load to malfunction. In this embodiment, through the drain connection of the MOS tube unit 201, the voltage of the input module 10 can be transmitted to the output module 30 at a specific slope, meeting the power supply rise time requirements of different devices while avoiding overshoot and damage to the equipment.

[0037] In one embodiment, the operational amplifier and control unit 204 includes a first operational amplifier U1 and a first capacitor C1. The first operational amplifier U1 determines the output voltage according to the input voltage difference. The first capacitor C1 is used to compensate for the frequency response of the first operational amplifier U1.

[0038] Specifically, the operational amplifier and control unit 204 consists of a first operational amplifier U1 and a first capacitor C1. The first operational amplifier U1 is an operational amplifier, an electronic amplifier with high gain, high input impedance, and low output impedance. The first operational amplifier U1 receives voltage signals from the forward input unit 202 and the reverse input unit 203, and determines the output voltage based on the voltage difference between the two inputs. By comparing the voltage changes of the input module 10 and the output module 30, the first operational amplifier U1 generates a corresponding control signal for controlling the conduction state of the MOS transistor unit 201. The first capacitor C1 is used in conjunction with the first operational amplifier U1 (U1 / C1) to primarily compensate for the frequency response of the first operational amplifier U1. In a circuit, a capacitor has the characteristics of passing AC and blocking DC. When signals of different frequencies pass through the first operational amplifier U1, the first capacitor C1 can interact with the internal circuitry of the first operational amplifier U1 to adjust the gain and phase characteristics of the first operational amplifier U1, thereby improving its frequency response.

[0039] In one embodiment, the positive input terminal IN+ of the first operational amplifier U1 is connected to the positive input unit 202, the negative input terminal IN- of the first operational amplifier U1 is connected to the negative input unit 203, and the output terminal of the first operational amplifier U1 is connected to the gate of the MOS tube unit 201.

[0040] Specifically, the positive input terminal IN+ of the first operational amplifier U1 is connected to the positive input unit 202. The positive input unit 202 comprises a third resistor R3 and a fourth resistor R4, which divide the voltage of the input module 10 and input the signal to the positive input terminal IN+ of the first operational amplifier U1, allowing the first operational amplifier U1 to receive a signal reflecting voltage changes in the input module 10 in real time. The negative input terminal IN- of the first operational amplifier U1 is connected to the negative input unit 203. The negative input unit 203 comprises a fifth resistor R5 and a sixth resistor R6, which divide the voltage of the output module 30 and input the signal to the negative input terminal IN- of the first operational amplifier U1, allowing the first operational amplifier U1 to obtain voltage change information of the output module 30. By connecting the input terminals of the first operational amplifier U1 to the positive input unit 202 and the negative input unit 203, respectively, the first operational amplifier U1 can accurately sense voltage changes in the input module 10 and the output module 30. The output terminal of the first operational amplifier U1 is connected to the gate of the MOS transistor unit 201. MOS transistor unit 201 includes a first MOS transistor M1 and a second MOS transistor M2. The output voltage of the first operational amplifier U1 acts as a control signal, directly acting on the gate of the MOS transistor unit 201 to control the conduction level of the MOS transistor unit 201. This enables the first operational amplifier U1 to quickly respond to changes in input and output, accurately adjust the power-on slope, and improve the stability and reliability of the circuit.

[0041] In one embodiment, the first capacitor C1 is connected in parallel to the first operational amplifier U1. Specifically, the first capacitor C1 provides a stable operating environment for the first operational amplifier U1. In the circuit, factors such as power supply fluctuations and electromagnetic interference may affect the normal operation of the first operational amplifier U1. The first capacitor C1 can act as a filter, filtering out high-frequency noise and interference signals in the power supply, so that nodes such as the power supply pin of the first operational amplifier U1 maintain a relatively stable voltage. At the same time, the first capacitor C1 compensates for the frequency response of the first operational amplifier U1. When the first operational amplifier U1 processes input signals of different frequencies, its gain and phase characteristics may change. The first capacitor C1 can adjust the bandwidth of the first operational amplifier U1, so that the operational amplifier can better maintain linear amplification characteristics within a certain frequency range.

[0042] In one embodiment, the forward input unit 202 includes a third resistor R3 and a fourth resistor R4 . The third resistor R3 and the fourth resistor R4 divide the voltage of the input module 10 and then input the voltage to the operational amplifier and control unit 204 .

[0043] Specifically, the forward input unit 202 is composed of a third resistor R3 and a fourth resistor R4. These two resistors divide the voltage of the input module 10 (R3 / R4), reducing the high voltage of the input module 10 by a certain ratio to a voltage range suitable for the input of the op amp and control unit 204. This prevents excessive input voltage from damaging the op amp or affecting its normal operation. At the same time, properly selecting the resistor values can achieve a precise voltage division ratio, providing an accurate input signal to the first op amp U1. This allows the first op amp U1 to understand the magnitude and changes of the input voltage, thereby promptly adjusting the conduction state of the MOS tube unit 201 and ensuring that the power-up process of the output module 30 meets the requirements.

[0044] In one embodiment, the reverse input unit 203 includes a fifth resistor R5 and a sixth resistor R6 . The fifth resistor R5 and the sixth resistor R6 divide the voltage of the output module 30 and then input the voltage to the operational amplifier and control unit 204 .

[0045] Specifically, the reverse input unit 203 is composed of a fifth resistor R5 and a sixth resistor R6. In the circuit, the fifth resistor R5 and the sixth resistor R6 divide the voltage of the output module 30 (R6 / R5). After the high voltage of the output module 30 is divided by the fifth resistor R5 and the sixth resistor R6, the voltage is reduced according to a certain ratio to a voltage range suitable for the input of the operational amplifier and control unit 204, and then input into the operational amplifier and control unit 204. The reverse input terminal IN- of the first operational amplifier U1 in the operational amplifier and control unit 204 receives this divided voltage signal, thereby understanding the voltage change of the output module 30, so as to compare it with the voltage information of the input module 10 provided by the forward input unit 202, and thus generate a corresponding control signal.

[0046] In one embodiment, the gate control unit 205 includes a first resistor R1 and a second resistor R2 . The first resistor R1 and the second resistor R2 control the gate voltage of the MOS tube unit 201 to control the conduction speed of the MOS tube unit 201 .

[0047] Specifically, the gate control unit 205 is composed of a first resistor R1 and a second resistor R2, and is connected to the gate of the MOS transistor unit 201. By adjusting the resistance value, the voltage (R2 / R1) applied to the MOS transistor gate can be changed, thereby changing the rise or fall speed of the gate voltage, thereby accurately controlling the conduction speed of the MOS transistor unit 201. It is understood that in other embodiments, the resistance value can be flexibly adjusted according to different equipment requirements and operating conditions to achieve optimal power-on slope control, thereby improving the adaptability and reliability of the circuit.

[0048] Furthermore, in this embodiment, the specific steps of controlling the power-on slope by the slope control module 20 are as follows:

[0049] Step 1. Turn on the power supply (+5V) and the power supply VIN rises rapidly.

[0050] Step 2: After voltage division by the positive input unit 202 (R3 / R4), the power supply VIN enters the positive input terminal IN+ of the first op amp U1. The output voltage VOUT of the output module 30 enters the negative input terminal IN- of the first op amp U1 after voltage division by the negative input unit 203 (R6 / R5). Since the MOS transistor unit 201 (M1 / M2) is not yet turned on, the output voltage VOUT of the output module 30 and the negative input terminal IN- are both negative. At this point, the voltage at the positive input terminal IN+ is greater than the voltage at the negative input terminal IN-. The first op amp U1 begins outputting, and the voltage at the output terminal OUT of the first op amp U1 rapidly rises from 0V.

[0051] Step 3: The gate (G) voltage of the MOS transistor unit 201 (M1 / M2) begins to rise rapidly, and the MOS transistor unit 201 (M1 / M2) quickly approaches the on state (not yet fully turned on at this time). A voltage begins to appear on the output voltage VOUT of the output module 30, and the reverse input terminal IN- begins to output a voltage. The voltage difference between the positive input terminal IN+ and the reverse input terminal IN- becomes smaller, causing the output voltage of the first operational amplifier U1 to rise slowly.

[0052] Step 4: The rising trend of the gate (G) voltage of the MOS tube unit 201 (M1 / M2) becomes slow, and the conduction of the MOS tube unit 201 (M1 / M2) becomes slow. After 5ms, the MOS tube unit 201 (M1 / M2) is fully turned on, and the output voltage VOUT of the output module 30 reaches 5V.

[0053] It can be seen from this that in this embodiment, the output voltage VOUT of the output module 30 will not rise quickly following the power supply VIN, but will rise slowly according to a certain power-on time. By adjusting the resistance values of the forward input unit 202 and the reverse input unit 203, the power-on time can be lengthened or shortened, thereby meeting the power-on time requirements of the chip.

[0054] In summary, the power-on slope control circuit in this embodiment, on the one hand, utilizes the various components in the slope control module to work together to accurately control the power-on slope, thereby avoiding instantaneous high-voltage damage to the chip caused by power-on overshoot; on the other hand, by adjusting the parameters of the various resistors and capacitors in the circuit, the duration of the power-on slope is changed. By meeting the power-on time requirements of the load (chip), it is ensured that the chip starts and works at an appropriate voltage rise rate, and no abnormalities occur due to the power-on time being too fast or too slow, thereby ensuring the safe and reliable operation of the chip.

[0055] The above examples are merely used to further illustrate the technical content of the present invention for easier understanding by the reader. However, they do not limit the implementation of the present invention to these examples. Any technical extension or reinvention based on the present invention is protected by the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A power-on slope control circuit, characterized in that: include: An input module, a slope control module and an output module; the input module is used to provide a power supply voltage and transmit it to the output module and the slope control module, the slope control module is used to control the power-on slope of the output module, and the output module is used to output voltage to the load under the control of the slope control module.

2. The power-on slope control circuit according to claim 1, characterized in that: The slope control module includes a MOS tube unit, a forward input unit, a reverse input unit, an operational amplifier and control unit, and a gate control unit; the MOS tube unit is gradually turned on under the control of the operational amplifier and control unit, so that the voltage of the input module is conducted to the output module with a set slope; the forward input unit is used to enable the operational amplifier and control unit to receive the voltage change of the input module; the reverse input unit is used to enable the operational amplifier and control unit to receive the voltage change of the output module; the operational amplifier and control unit controls the output voltage according to the voltage difference between the forward input and the reverse input; the gate control unit is used to control the conduction speed of the MOS tube unit.

3. The power-on slope control circuit according to claim 2, characterized in that: The MOS transistor unit includes a first MOS transistor M1 and a second MOS transistor M2 , and the first MOS transistor M1 and the second MOS transistor M2 work together to control the conduction between the input module and the output module.

4. The power-on slope control circuit according to claim 3, characterized in that: The gate of the MOS tube unit is connected to the gate control unit, the source of the MOS tube unit is connected to the power supply VIN of the input module, and the drain of the MOS tube unit is connected to the output module.

5. The power-on slope control circuit according to claim 2, characterized in that: The operational amplifier and control unit includes a first operational amplifier U1 and a first capacitor C1. The first operational amplifier U1 determines the output voltage according to the input voltage difference. The first capacitor C1 is used to compensate for the frequency response of the first operational amplifier U1.

6. The power-on slope control circuit according to claim 5, characterized in that: The positive input terminal IN+ of the first operational amplifier U1 is connected to the positive input unit, the negative input terminal IN- of the first operational amplifier U1 is connected to the negative input unit, and the output terminal of the first operational amplifier U1 is connected to the gate of the MOS tube unit.

7. The power-on slope control circuit according to claim 6, characterized in that: The first capacitor C1 is connected in parallel to the first operational amplifier U1.

8. The power-on slope control circuit according to claim 2, characterized in that: The forward input unit includes a third resistor R3 and a fourth resistor R4. The third resistor R3 and the fourth resistor R4 divide the voltage of the input module and then input the voltage to the operational amplifier and control unit.

9. The power-on slope control circuit according to claim 2, characterized in that: The reverse input unit includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 and the sixth resistor R6 divide the voltage of the output module and then input the voltage to the operational amplifier and control unit.

10. The power-on slope control circuit according to claim 2, characterized in that: The gate control unit includes a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 control the gate voltage of the MOS tube unit to control the conduction speed of the MOS tube unit.

Images