Soft start circuit of NOR Flash chip

Abstract

The invention discloses a soft start circuit of a NOR Flash chip, and relates to the field of safety protection, and the soft start circuit of the NOR Flash chip comprises a voltage introduction module which is used for introducing an alternating current, converting the alternating current into a direct current, and outputting the direct current to a power supply control module; the power supply control module is used for outputting stable voltage to the chip working module and the soft start protection module; the chip working module is used for working of the NOR Flash chip; and the soft start protection module is used for controlling the impedance of the NOR Flash chip when the NOR Flash chip is electrified to work, compared with the prior art, the circuit has the beneficial effects that the circuit impedance of the NOR Flash chip can be gradually recovered as time goes on in the electrifying process through the arrangement of the soft start protection module, and the condition that the impedance suddenly returns to normal is avoided, so that the circuit impedance of the NOR Flash chip is reduced, and the reliability of the NOR Flash chip is improved. The abrupt change current is prevented from being generated, and the NOR Flash chip is prevented from heating to influence the performance of the chip.

Description

Technical Field

[0001] The invention relates to the field of safety protection, in particular to a soft start circuit of a NOR Flash chip. Background Art

[0002] In NOR Flash chips, soft start can achieve a smooth transition from a stopped state to a normal working state of the chip, avoiding voltage fluctuations and electromagnetic interference caused by current mutations, thereby improving system reliability.

[0003] The existing soft start often sets additional impedance at the beginning and restores the impedance after a delay. The impedance recovery process lacks a transition process, which causes a sudden current when the impedance is restored, causing the NOR Flash chip to heat up, which needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a soft start circuit for a NOR Flash chip to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A soft start circuit for a NOR Flash chip, comprising:

[0007] A voltage introduction module is used to introduce AC power, convert it into DC power, and output it to the power supply control module;

[0008] Power supply control module, used to output stable voltage to supply chip working module and soft start protection module;

[0009] Chip working module, used for NOR Flash chip working;

[0010] The soft start protection module is used to control the impedance of the NOR Flash chip when the NOR Flash chip is powered on, so that the impedance gradually returns to normal impedance;

[0011] The output end of the voltage introduction module is connected to the input end of the power supply control module, the output end of the power supply control module is connected to the first input end of the chip working module and the input end of the soft start protection module, and the output end of the soft start protection module is connected to the second input end of the chip working module.

[0012] As a further solution of the present invention: the voltage introduction module includes a transformer, a rectifier, a first capacitor, a second capacitor, a first inductor, and a second resistor. One end of the input end of the transformer is connected to the live wire, and the other end of the input end of the transformer is connected to the neutral wire. One end of the output end of the transformer is connected to the first end of the rectifier, and the other end of the output end of the transformer is connected to the third end of the rectifier. The second end of the rectifier is grounded, the fourth end of the rectifier is connected to one end of the first capacitor and one end of the first inductor, and the other end of the first capacitor is grounded. The other end of the first inductor is connected to one end of the second capacitor and one end of the second resistor, and the other end of the second capacitor is grounded. The other end of the second resistor is connected to the input end of the power supply control module.

[0013] As a further solution of the present invention: the power supply control module includes:

[0014] The voltage-stabilized power supply unit is used to output a stable voltage to supply the chip working module, soft start protection module, and relay control unit during operation;

[0015] A relay control unit, used to drive the chip working module to work after a working delay;

[0016] The input end of the voltage-stabilized power supply unit is connected to the output end of the voltage introduction module, and the output end of the voltage-stabilized power supply unit is connected to the first input end of the chip working module, the input end of the soft start protection module, and the input end of the relay control unit.

[0017] As a further solution of the present invention: the voltage-stabilized power supply unit includes a third capacitor, a voltage regulator, and a fourth capacitor. The input end of the voltage regulator is connected to one end of the third capacitor and the output end of the voltage introduction module, the other end of the third capacitor is grounded, the ground end of the voltage regulator is grounded, the output end of the voltage regulator is connected to one end of the fourth capacitor, the first input end of the chip working module, the input end of the soft start protection module, and the input end of the relay control unit, and the other end of the fourth capacitor is grounded.

[0018] As a further solution of the present invention: the relay control unit includes a first relay and a first diode, one end of the first relay is connected to the cathode of the first diode and the output end of the voltage-stabilizing power supply unit, the anode of the first diode is grounded, and the other end of the first relay is grounded.

[0019] As a further solution of the present invention: the chip working module includes a first switch, a second MOS tube, a first resistor, and a NOR Flash chip. One end of the first switch is connected to the output end of the power supply control module, the other end of the first switch is connected to one end of the first resistor and the D pole of the second MOS tube, the other end of the first resistor is connected to the S pole of the second MOS tube and one end of the NOR Flash chip, the other end of the NOR Flash chip is grounded, and the G pole of the second MOS tube is connected to the output end of the soft start protection module.

[0020] As a further solution of the present invention: the soft start protection module includes:

[0021] A voltage gradient unit is used to generate a gradient voltage that gradually increases over time and supplies it to the PWM output unit. When the gradient voltage reaches a maximum value, it will no longer increase.

[0022] A PWM output unit, used to generate a PWM signal with a changing duty cycle based on a gradually changing voltage to control the impedance change of the chip working module;

[0023] The constant voltage output unit is used to output a constant voltage when the gradual voltage reaches a threshold value to control the impedance of the chip working module to no longer change and to become the impedance of normal operation;

[0024] The input end of the voltage gradient unit is connected to the first input end of the constant voltage output unit and the output end of the power supply control module, the output end of the voltage gradient unit is connected to the input end of the PWM output unit and the second input end of the constant voltage output unit, the output end of the PWM output unit is connected to the second input end of the chip working module, and the output end of the constant voltage output unit is connected to the second input end of the chip working module.

[0025] As a further solution of the present invention: the voltage gradient unit includes a fourth resistor, a first potentiometer, and a sixth capacitor, one end of the fourth resistor is connected to the output end of the power supply control module, the other end of the fourth resistor is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the sixth capacitor, the input end of the PWM output unit, and the second input end of the constant voltage output unit, and the other end of the sixth capacitor is grounded.

[0026] As a further solution of the present invention: the PWM output unit includes a second inverter, a third inverter, a sixth resistor, a fifth diode, and a fifth capacitor. The power supply end of the second inverter is connected to the output end of the voltage gradient unit, the input end of the second inverter is connected to one end of the sixth resistor and one end of the fifth capacitor, the other end of the fifth capacitor is grounded, the output end of the second inverter is connected to the other end of the sixth resistor and the input end of the third inverter, the output end of the third inverter is connected to the positive electrode of the fifth diode, and the negative electrode of the fifth diode is connected to the second input end of the chip working module.

[0027] As a further solution of the present invention: the constant voltage output unit includes a second diode, a third resistor, a third diode, a fifth resistor, a first MOS tube, and a fourth diode. The positive electrode of the second diode is connected to the output end of the power supply control module, the negative electrode of the second diode is connected to one end of the third resistor, the other end of the third resistor is connected to the D electrode of the first MOS tube, the S electrode of the first MOS tube is connected to the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected to the second input end of the chip working module, the G electrode of the first MOS tube is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the positive electrode of the third diode, and the negative electrode of the third diode is connected to the output end of the voltage gradient unit.

[0028] Compared with the prior art, the beneficial effect of the present invention is that: by setting a soft start protection module, the present invention gradually restores the circuit impedance of the NOR Flash chip over time during the power-on process, rather than the impedance suddenly returning to normal, thereby avoiding the generation of a sudden current, avoiding the NOR Flash chip from heating up, and affecting the chip performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of a soft start circuit for a NOR Flash chip.

[0030] Figure 2 The figure is a circuit diagram of a soft start circuit of a NOR Flash chip. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 , a soft start circuit of a NOR Flash chip, comprising:

[0033] A voltage introduction module is used to introduce AC power, convert it into DC power, and output it to the power supply control module;

[0034] Power supply control module, used to output stable voltage to supply chip working module and soft start protection module;

[0035] Chip working module, used for NOR Flash chip X1 working;

[0036] The soft start protection module is used to control the impedance of the NOR Flash chip X1 when the NOR Flash chip X1 is powered on, so that the impedance gradually returns to normal impedance;

[0037] The output end of the voltage introduction module is connected to the input end of the power supply control module, the output end of the power supply control module is connected to the first input end of the chip working module and the input end of the soft start protection module, and the output end of the soft start protection module is connected to the second input end of the chip working module.

[0038] In this example: See Figure 2 The voltage introduction module includes a transformer W1, a rectifier T, a first capacitor C1, a second capacitor C2, a first inductor L1, and a second resistor R2. One end of the input end of the transformer W1 is connected to the live wire L, and the other end of the input end of the transformer W1 is connected to the neutral wire N. One end of the output end of the transformer W1 is connected to the first end of the rectifier T, and the other end of the output end of the transformer W1 is connected to the third end of the rectifier T. The second end of the rectifier T is grounded. The fourth end of the rectifier T is connected to one end of the first capacitor C1 and one end of the first inductor L1, and the other end of the first capacitor C1 is grounded. The other end of the first inductor L1 is connected to one end of the second capacitor C2 and one end of the second resistor R2. The other end of the second capacitor C2 is grounded, and the other end of the second resistor R2 is connected to the input end of the power supply control module.

[0039] The voltage is introduced into the live wire L and the neutral wire N, which is stepped down after passing through the transformer W1, converted into direct current after passing through the rectifier T, and converted into stable direct current after passing through the first capacitor C1, the second capacitor C2, and the first inductor L1, and output to the power supply control module.

[0040] In this example: See Figure 2 , the power supply control module includes:

[0041] The voltage-stabilized power supply unit is used to output a stable voltage to supply the chip working module, soft start protection module, and relay control unit during operation;

[0042] A relay control unit, used to drive the chip working module to work after a working delay;

[0043] The input end of the voltage-stabilized power supply unit is connected to the output end of the voltage introduction module, and the output end of the voltage-stabilized power supply unit is connected to the first input end of the chip working module, the input end of the soft start protection module, and the input end of the relay control unit.

[0044] In this example: See Figure 2 The voltage-stabilized power supply unit includes a third capacitor C3, a voltage stabilizer U1, and a fourth capacitor C4. The input end of the voltage stabilizer U1 is connected to one end of the third capacitor C3 and the output end of the voltage introduction module, the other end of the third capacitor C3 is grounded, the ground end of the voltage stabilizer U1 is grounded, the output end of the voltage stabilizer U1 is connected to one end of the fourth capacitor C4, the first input end of the chip working module, the input end of the soft start protection module, and the input end of the relay control unit, and the other end of the fourth capacitor C4 is grounded.

[0045] After the voltage is input, the voltage regulator U1 outputs a stable voltage to supply the chip working module, soft start protection module and relay control unit.

[0046] In this example: See Figure 2 The relay control unit includes a first relay J1 and a first diode D1. One end of the first relay J1 is connected to the cathode of the first diode D1 and the output end of the voltage-stabilizing power supply unit. The anode of the first diode D1 is grounded. The other end of the first relay J1 is grounded.

[0047] The first relay J1 is a time relay. After starting to work, it starts to control the first switch S1 to close after a delay, so as to realize the delayed conduction of the chip working module after power-on, and give the soft start protection module a working time to avoid the failure to generate a PWM signal at the initial stage.

[0048] The first relay J1 can also be a normal relay, because there is a delay in the normal relay control switch, and this delay can be used as the working time of the soft start protection module. The time for the ordinary relay control switch to close or open varies depending on many factors, but generally this action can be completed in a shorter time. Specifically, this time range usually depends on factors such as the type, manufacturer, model, and working conditions of the relay. Different types of relays have different mechanical structures and control circuit designs, so the time for their control switches to close or open will also be different. For example, there may be differences in response time between electromagnetic relays and electronic relays. In general, the time for ordinary relays to control the switch to close or open can be between a few milliseconds and tens of milliseconds. This time range covers the performance of most common relays under normal working conditions. However, it should be noted that this time is not absolute, and the specific time value needs to be determined based on the actual situation of the relay. Therefore, the risk of using ordinary relays is greater.

[0049] In this example: See Figure 2 The chip working module includes a first switch S1, a second MOS tube V2, a first resistor R1, and a NOR Flash chip X1. One end of the first switch S1 is connected to the output end of the power supply control module, the other end of the first switch S1 is connected to one end of the first resistor R1 and the D pole of the second MOS tube V2, the other end of the first resistor R1 is connected to the S pole of the second MOS tube V2 and one end of the NOR Flash chip X1, the other end of the NOR Flash chip X1 is grounded, and the G pole of the second MOS tube V2 is connected to the output end of the soft start protection module.

[0050] The first switch S1 is normally open and will be closed only when controlled by the first relay J1.

[0051] The first switch S1 is closed, and the common point A first receives the PWM signal with gradually increasing duty cycle of the soft start protection module, and then receives the high level signal of the soft start protection module, so that after power-on, the conduction frequency of the second MOS tube V2 gradually increases until it is constantly turned on, so that the first resistor R1 is completely connected to the circuit where the NOR Flash chip X1 is located at the beginning, and the impedance is relatively large. As time goes by, the conduction frequency of the second MOS tube V2 gradually increases, so that the impedance gradually decreases. Finally, the high level signal of the soft start protection module is input, the second MOS tube V2 is constantly turned on, the first resistor R1 is equivalent to a short circuit, and the impedance of the loop where the NOR Flash chip X1 is located returns to normal, and the soft start of the NOR Flash chip X1 ends.

[0052] In this example: See Figure 2 , the soft start protection module includes:

[0053] A voltage gradient unit is used to generate a gradient voltage that gradually increases over time and supplies it to the PWM output unit. When the gradient voltage reaches a maximum value, it will no longer increase.

[0054] A PWM output unit, used to generate a PWM signal with a changing duty cycle based on a gradually changing voltage to control the impedance change of the chip working module;

[0055] The constant voltage output unit is used to output a constant voltage when the gradual voltage reaches a threshold value to control the impedance of the chip working module to no longer change and to become the impedance of normal operation;

[0056] The input end of the voltage gradient unit is connected to the first input end of the constant voltage output unit and the output end of the power supply control module, the output end of the voltage gradient unit is connected to the input end of the PWM output unit and the second input end of the constant voltage output unit, the output end of the PWM output unit is connected to the second input end of the chip working module, and the output end of the constant voltage output unit is connected to the second input end of the chip working module.

[0057] In this example: See Figure 2 The voltage gradient unit includes a fourth resistor R4, a first potentiometer RP1, and a sixth capacitor C6. One end of the fourth resistor R4 is connected to the output end of the power supply control module, the other end of the fourth resistor R4 is connected to one end of the first potentiometer RP1, the other end of the first potentiometer RP1 is connected to one end of the sixth capacitor C6, the input end of the PWM output unit, and the second input end of the constant voltage output unit, and the other end of the sixth capacitor C6 is grounded.

[0058] After the voltage is input, the sixth capacitor C6 is charged through the fourth resistor R4 and the first potentiometer RP1, so that the voltage on the sixth capacitor C6 gradually increases until it reaches the maximum voltage.

[0059] In this example: See Figure 2 The PWM output unit includes a second inverter U2, a third inverter U3, a sixth resistor R6, a fifth diode D5, and a fifth capacitor C5. The power supply end of the second inverter U2 is connected to the output end of the voltage gradient unit, the input end of the second inverter U2 is connected to one end of the sixth resistor R6 and one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is grounded, the output end of the second inverter U2 is connected to the other end of the sixth resistor R6 and the input end of the third inverter U3, the output end of the third inverter U3 is connected to the positive electrode of the fifth diode D5, and the negative electrode of the fifth diode D5 is connected to the second input end of the chip working module.

[0060] The voltage on the sixth capacitor C6 is the power supply voltage of the second inverter U2. Initially, the input terminal of the second inverter U2 is at a low level, and the second inverter U2 outputs a high level. The fifth capacitor C5 is charged through the sixth resistor R6. As the fifth capacitor C5 is charged, the in-phase terminal of the second inverter U2 is at a high level, and the second inverter U2 outputs a low level. The fifth capacitor C5 is discharged through the sixth resistor R6 and becomes a low level again. This is repeated, and a PWM signal is formed at the output terminal of the second inverter U2. Since the voltage at the power supply terminal of the second inverter U2 gradually increases, the voltage at the output terminal of the second inverter U2 when the output terminal outputs a high level also gradually increases, so that the charging time of the fifth capacitor C5 is reduced, while the discharging time remains unchanged, so that as time goes by, the duty cycle of the PWM signal output by the second inverter U2 decreases, and after passing through the third inverter U3, the duty cycle of the output PWM signal gradually increases. This causes the conduction frequency of the second MOS tube V2 to gradually increase.

[0061] In this example: See Figure 2 The constant voltage output unit includes a second diode D2, a third resistor R3, a third diode D3, a fifth resistor R5, a first MOS tube V1, and a fourth diode D4. The anode of the second diode D2 is connected to the output end of the power supply control module, the cathode of the second diode D2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the D pole of the first MOS tube V1, the S pole of the first MOS tube V1 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the second input end of the chip working module, the G pole of the first MOS tube V1 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the output end of the voltage gradient unit.

[0062] When the voltage on the sixth capacitor C6 gradually increases and reaches a level sufficient to turn on the third diode D3, the G pole of the first MOS tube V1 becomes high level, which triggers the first MOS tube V1 to turn on, so that the voltage outputs a constant high level through the first MOS tube V1 to trigger the second MOS tube V2 to be constantly turned on.

[0063] The chip working module has a complete working process. After the circuit is powered on, the first switch S1 is closed based on the delay control of the first relay J1, so that the chip working module is not powered on when the PWM output unit outputs the PWM signal at the beginning. After the first switch S1 is closed, the chip working module is powered on. At this time, the duty cycle of the PWM signal output by the PWM output unit gradually increases, so that the impedance of the chip working module gradually decreases. As time goes by, the voltage on the sixth capacitor C6 reaches the threshold, so that the first MOS tube V1 is turned on, and a constant high level is output through the fourth diode D4 to trigger the second MOS tube V2 to be constantly turned on. Ignoring the voltage drop of the second MOS tube V2, the first resistor R1 can be regarded as a short circuit, and the impedance of the loop where the NOR Flash chip X1 is located is restored to normal, completing the soft start.

[0064] The working principle of the present invention is: the voltage introduction module is used to introduce alternating current and convert it into direct current, and output it to the power supply control module; the power supply control module is used to output a stable voltage to supply a chip working module and a soft start protection module; the chip working module is used for the NOR Flash chip X1 to work; the soft start protection module is used to control the impedance of the NOR Flash chip X1 when the NOR Flash chip X1 is powered on, so that the impedance gradually returns to normal impedance.

[0065] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0066] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A soft start circuit for a NOR Flash chip, characterized in that: The soft start circuit of the NOR Flash chip includes: A voltage introduction module is used to introduce AC power, convert it into DC power, and output it to the power supply control module; Power supply control module, used to output stable voltage to supply chip working module and soft start protection module; Chip working module, used for NOR Flash chip working; The soft start protection module is used to control the impedance of the NOR Flash chip when the NOR Flash chip is powered on, so that the impedance gradually returns to normal impedance; The output end of the voltage introduction module is connected to the input end of the power supply control module, the output end of the power supply control module is connected to the first input end of the chip working module and the input end of the soft start protection module, and the output end of the soft start protection module is connected to the second input end of the chip working module.

2. The soft start circuit of the NOR Flash chip according to claim 1, characterized in that: The voltage introduction module includes a transformer, a rectifier, a first capacitor, a second capacitor, a first inductor, and a second resistor. One end of the input end of the transformer is connected to the live wire, the other end of the input end of the transformer is connected to the neutral wire, one end of the output end of the transformer is connected to the first end of the rectifier, the other end of the output end of the transformer is connected to the third end of the rectifier, the second end of the rectifier is grounded, the fourth end of the rectifier is connected to one end of the first capacitor and one end of the first inductor, the other end of the first capacitor is grounded, the other end of the first inductor is connected to one end of the second capacitor and one end of the second resistor, the other end of the second capacitor is grounded, and the other end of the second resistor is connected to the input end of the power supply control module.

3. The soft start circuit of the NOR Flash chip according to claim 1, characterized in that: The power supply control module includes: The voltage-stabilized power supply unit is used to output a stable voltage to supply the chip working module, soft start protection module, and relay control unit during operation; A relay control unit, used to drive the chip working module to work after a working delay; The input end of the voltage-stabilized power supply unit is connected to the output end of the voltage introduction module, and the output end of the voltage-stabilized power supply unit is connected to the first input end of the chip working module, the input end of the soft start protection module, and the input end of the relay control unit.

4. The soft start circuit of the NOR Flash chip according to claim 3, characterized in that: The voltage-stabilized power supply unit includes a third capacitor, a voltage stabilizer, and a fourth capacitor. The input end of the voltage stabilizer is connected to one end of the third capacitor and the output end of the voltage introduction module, the other end of the third capacitor is grounded, the ground end of the voltage stabilizer is grounded, the output end of the voltage stabilizer is connected to one end of the fourth capacitor, the first input end of the chip working module, the input end of the soft start protection module, and the input end of the relay control unit, and the other end of the fourth capacitor is grounded.

5. The soft start circuit of the NOR Flash chip according to claim 3, characterized in that: The relay control unit comprises a first relay and a first diode, one end of the first relay is connected to the cathode of the first diode and the output end of the voltage-stabilizing power supply unit, the anode of the first diode is grounded, and the other end of the first relay is grounded.

6. The soft start circuit of the NOR Flash chip according to claim 1, characterized in that: The chip working module includes a first switch, a second MOS tube, a first resistor, and a NOR Flash chip. One end of the first switch is connected to the output end of the power supply control module, the other end of the first switch is connected to one end of the first resistor and the D pole of the second MOS tube, the other end of the first resistor is connected to the S pole of the second MOS tube and one end of the NOR Flash chip, the other end of the NOR Flash chip is grounded, and the G pole of the second MOS tube is connected to the output end of the soft start protection module.

7. The soft start circuit of the NOR Flash chip according to any one of claims 1 to 6, characterized in that: The soft start protection module includes: A voltage gradient unit is used to generate a gradient voltage that gradually increases over time and supplies it to the PWM output unit. When the gradient voltage reaches a maximum value, it will no longer increase. A PWM output unit, used to generate a PWM signal with a changing duty cycle based on a gradually changing voltage to control the impedance change of the chip working module; The constant voltage output unit is used to output a constant voltage when the gradual voltage reaches a threshold value to control the impedance of the chip working module to no longer change and to become the impedance of normal operation; The input end of the voltage gradient unit is connected to the first input end of the constant voltage output unit and the output end of the power supply control module, the output end of the voltage gradient unit is connected to the input end of the PWM output unit and the second input end of the constant voltage output unit, the output end of the PWM output unit is connected to the second input end of the chip working module, and the output end of the constant voltage output unit is connected to the second input end of the chip working module.

8. The soft start circuit of the NOR Flash chip according to claim 7, characterized in that: The voltage gradient unit includes a fourth resistor, a first potentiometer, and a sixth capacitor. One end of the fourth resistor is connected to the output end of the power supply control module, the other end of the fourth resistor is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the sixth capacitor, the input end of the PWM output unit, and the second input end of the constant voltage output unit, and the other end of the sixth capacitor is grounded.

9. The soft start circuit of the NOR Flash chip according to claim 7, characterized in that: The PWM output unit includes a second inverter, a third inverter, a sixth resistor, a fifth diode, and a fifth capacitor. The power supply end of the second inverter is connected to the output end of the voltage gradient unit, the input end of the second inverter is connected to one end of the sixth resistor and one end of the fifth capacitor, the other end of the fifth capacitor is grounded, the output end of the second inverter is connected to the other end of the sixth resistor and the input end of the third inverter, the output end of the third inverter is connected to the positive electrode of the fifth diode, and the negative electrode of the fifth diode is connected to the second input end of the chip working module.

10. The soft start circuit of the NOR Flash chip according to claim 7, characterized in that: The constant voltage output unit includes a second diode, a third resistor, a third diode, a fifth resistor, a first MOS tube, and a fourth diode. The positive electrode of the second diode is connected to the output end of the power supply control module, the negative electrode of the second diode is connected to one end of the third resistor, the other end of the third resistor is connected to the D pole of the first MOS tube, the S pole of the first MOS tube is connected to the positive pole of the fourth diode, the negative pole of the fourth diode is connected to the second input end of the chip working module, the G pole of the first MOS tube is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the positive pole of the third diode, and the negative pole of the third diode is connected to the output end of the voltage gradient unit.

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