CN114374314A

CN114374314A - Soft start circuit and equipment

Info

Publication number: CN114374314A
Application number: CN202210180401.4A
Authority: CN
Inventors: 范建功
Original assignee: Nubia Technology Co Ltd
Current assignee: Nubia Technology Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-04-19

Abstract

The invention discloses a soft start circuit and a device, wherein the circuit comprises: the power supply circuit comprises a power supply input end VDD, a power supply control end VDD _ EN, a power supply output end VDD _ OUT, an MOS tube P0 and a triode Q0, wherein the power supply input end VDD is connected with one end of a capacitor C0, one end of a resistor R0 and a source of the MOS tube P0, a drain of the MOS tube P0 is connected to the power supply output end VDD _ OUT, the other end of the capacitor C0, the other end of the resistor R0 and a gate of the MOS tube P0 are connected with one end of a resistor R1, the other end of the resistor R1 is connected to a collector of the triode Q0, the power supply control end VDD _ EN is connected to one end of a resistor R3 and a base of the triode Q0 through the resistor R2, and an emitter of the triode Q0 and the other end of the resistor R3 are grounded. The invention effectively solves the problem of screen splash of a low-temperature screen caused by latch effect under the condition that a display IC circuit cannot be changed in a low-temperature state and the condition that a soft start circuit is designed by self.

Description

Soft start circuit and equipment

Technical Field

The invention relates to the field of mobile communication, in particular to a soft start circuit and soft start equipment.

Background

In the prior art, with the continuous development of intelligent terminal equipment, the entity keys of the equipment are replaced more and more, and a touch screen is used as a substitute. For example, the touch screen of the smart phone is the most obvious part for the user to perceive, and the part will display the contents of the colorful colors that the user can see, including the display of the game interface, the most obvious part for the user to perceive is often the most concerned place for the mobile phone manufacturer, the design of the display will directly concern the public praise of the user, and the accumulation of brands, so that the design needs to consider a plurality of scenes of the user, including the requirements of high and low temperature, and one of the basic guarantees of the design of high and low temperature needs to be free of any abnormality at the high temperature of 60 ℃ and the low temperature of-20 ℃.

However, when the existing intelligent device is designed and selected, the latch-up effect generated by the IC circuit is probably caused by the insufficient evaluation, so that the screen is blurred at the temperature of-20 ℃ again, which is unacceptable for users.

Therefore, in the case where the display IC circuit is not changeable, the influence of the latch-up effect is fundamentally eliminated, and the problem of the risk of the low-temperature screen splash is solved.

Disclosure of Invention

In order to solve the technical defects in the prior art, the invention provides a soft start circuit, which comprises: the power supply circuit comprises a power supply input end VDD, a power supply control end VDD _ EN, a power supply output end VDD _ OUT, an MOS tube P0 and a triode Q0, wherein the power supply input end VDD is connected with one end of a capacitor C0, one end of a resistor R0 and a source of the MOS tube P0, a drain of the MOS tube P0 is connected to the power supply output end VDD _ OUT, the other end of the capacitor C0, the other end of the resistor R0 and a gate of the MOS tube P0 are connected with one end of a resistor R1, the other end of the resistor R1 is connected to a collector of the triode Q0, the power supply control end VDD _ EN is connected to one end of a resistor R3 and a base of the triode Q0 through the resistor R2, and an emitter of the triode Q0 and the other end of the resistor R3 are grounded.

Optionally, the on-resistance R of the MOS transistor P0_ONAnd the gate-source voltage V of the MOS transistor P0_GSIn an inversely proportional relationship, wherein,

optionally, the input voltage of the power control terminal VDD _ EN is controlled to gradually turn on the transistor Q0, so as to reduce the voltage of the collector of the transistor Q0.

Optionally, during the process that the transistor Q0 is gradually turned on, the voltage of the capacitor C0 is discharged through the resistor R0, so that the voltage of the gate of the MOS transistor P0 slowly drops.

Optionally, the gate-source voltage V is controlled during the process that the voltage of the gate of the MOS transistor P0 is slowly decreased_GSThe state of change of (c).

Optionally, according to the gate-source voltage V_GSThe on-resistance of the MOS transistor P0 is controlled by the changing state of the voltage, so that the power output terminal VDD _ OUT does not change abruptly.

Optionally, the power supply further comprises a latch-up circuit, the latch-up circuit comprises a PNP type triode and a parasitic capacitor, and the power supply output terminal VDD _ OUT is connected to the power supply input terminal of the latch-up circuit.

Optionally, the charging state of the parasitic capacitor is controlled by controlling a rising state of the power output terminal VDD _ OUT.

Optionally, the charging state of the parasitic capacitor controls the voltage of the base of the PNP type transistor to rise along with the slow rise of the power output terminal VDD _ OUT, so that the PNP type transistor is always in an on state.

The invention also proposes a device comprising a soft start circuit as described above.

A soft start circuit and apparatus embodying the invention, the circuit comprising: the power supply circuit comprises a power supply input end VDD, a power supply control end VDD _ EN, a power supply output end VDD _ OUT, an MOS tube P0 and a triode Q0, wherein the power supply input end VDD is connected with one end of a capacitor C0, one end of a resistor R0 and a source of the MOS tube P0, a drain of the MOS tube P0 is connected to the power supply output end VDD _ OUT, the other end of the capacitor C0, the other end of the resistor R0 and a gate of the MOS tube P0 are connected with one end of a resistor R1, the other end of the resistor R1 is connected to a collector of the triode Q0, the power supply control end VDD _ EN is connected to one end of a resistor R3 and a base of the triode Q0 through the resistor R2, and an emitter of the triode Q0 and the other end of the resistor R3 are grounded. By properly debugging the rising time of the soft start circuit, the invention not only ensures that the voltage rising of VDD does not influence the normal on-off of the screen, but also ensures that the problem of screen blooming at low temperature cannot be caused. The invention effectively solves the problem of screen splash of a low-temperature screen caused by latch effect under the condition that a display IC circuit cannot be changed in a low-temperature state and the condition that a soft start circuit is designed by self.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic diagram of a hardware structure of a mobile terminal according to the present invention;

fig. 2 is a communication network system architecture diagram provided by an embodiment of the present invention;

FIG. 3 is a first circuit diagram of a first embodiment of the soft start circuit of the present invention;

FIG. 4 is a second circuit diagram of a second embodiment of the soft start circuit of the present invention;

FIG. 5 is a third circuit diagram of a second embodiment of the soft start circuit of the present invention;

FIG. 6 is a fourth circuit diagram of a second embodiment of the soft start circuit of the present invention;

fig. 7 is a fifth circuit diagram of a second embodiment of the soft start circuit of the present invention.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

The terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and the like, and a fixed terminal such as a Digital TV, a desktop computer, and the like.

The following description will be given by way of example of a mobile terminal, and it will be understood by those skilled in the art that the construction according to the embodiment of the present invention can be applied to a fixed type terminal, in addition to elements particularly used for mobile purposes.

Referring to fig. 1, which is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention, the mobile terminal 100 may include: RF (Radio Frequency) unit 101, WiFi module 102, audio output unit 103, a/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 1 is not intended to be limiting of mobile terminals, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The following describes each component of the mobile terminal in detail with reference to fig. 1:

the radio frequency unit 101 may be configured to receive and transmit signals during information transmission and reception or during a call, and specifically, receive downlink information of a base station and then process the downlink information to the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with a network and other devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), CDMA2000(Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division duplex Long Term Evolution), and TDD-LTE (Time Division duplex Long Term Evolution).

WiFi belongs to short-distance wireless transmission technology, and the mobile terminal can help a user to receive and send e-mails, browse webpages, access streaming media and the like through the WiFi module 102, and provides wireless broadband internet access for the user. Although fig. 1 shows the WiFi module 102, it is understood that it does not belong to the essential constitution of the mobile terminal, and may be omitted entirely as needed within the scope not changing the essence of the invention.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output as sound when the mobile terminal 100 is in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, and the like.

The a/V input unit 104 is used to receive audio or video signals. The a/V input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, the Graphics processor 1041 Processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 may receive sounds (audio data) via the microphone 1042 in a phone call mode, a recording mode, a voice recognition mode, or the like, and may be capable of processing such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.

The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the mobile terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, may collect a touch operation performed by a user on or near the touch panel 1071 (e.g., an operation performed by the user on or near the touch panel 1071 using a finger, a stylus, or any other suitable object or accessory), and drive a corresponding connection device according to a predetermined program. The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and can receive and execute commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. In particular, other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like, and are not limited to these specific examples.

Further, the touch panel 1071 may cover the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although the touch panel 1071 and the display panel 1061 are shown in fig. 1 as two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the mobile terminal, and is not limited herein.

The interface unit 108 serves as an interface through which at least one external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and external devices.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The mobile terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system.

Although not shown in fig. 1, the mobile terminal 100 may further include a bluetooth module or the like, which is not described in detail herein.

In order to facilitate understanding of the embodiments of the present invention, a communication network system on which the mobile terminal of the present invention is based is described below.

Referring to fig. 2, fig. 2 is an architecture diagram of a communication Network system according to an embodiment of the present invention, where the communication Network system is an LTE system of a universal mobile telecommunications technology, and the LTE system includes a UE (User Equipment) 201, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, an EPC (Evolved Packet Core) 203, and an IP service 204 of an operator, which are in communication connection in sequence.

Specifically, the UE201 may be the terminal 100 described above, and is not described herein again.

The E-UTRAN202 includes eNodeB2021 and other eNodeBs 2022, among others. Among them, the eNodeB2021 may be connected with other eNodeB2022 through backhaul (e.g., X2 interface), the eNodeB2021 is connected to the EPC203, and the eNodeB2021 may provide the UE201 access to the EPC 203.

The EPC203 may include an MME (Mobility Management Entity) 2031, an HSS (Home Subscriber Server) 2032, other MMEs 2033, an SGW (Serving gateway) 2034, a PGW (PDN gateway) 2035, and a PCRF (Policy and Charging Rules Function) 2036, and the like. The MME2031 is a control node that handles signaling between the UE201 and the EPC203, and provides bearer and connection management. HSS2032 is used to provide registers to manage functions such as home location register (not shown) and holds subscriber specific information about service characteristics, data rates, etc. All user data may be sent through SGW2034, PGW2035 may provide IP address assignment for UE201 and other functions, and PCRF2036 is a policy and charging control policy decision point for traffic data flow and IP bearer resources, which selects and provides available policy and charging control decisions for a policy and charging enforcement function (not shown).

The IP services 204 may include the internet, intranets, IMS (IP Multimedia Subsystem), or other IP services, among others.

Although the LTE system is described as an example, it should be understood by those skilled in the art that the present invention is not limited to the LTE system, but may also be applied to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, and future new network systems.

Based on the above mobile terminal hardware structure and communication network system, the present invention provides various embodiments of the method.

Example one

Fig. 3 is a first circuit diagram of a first embodiment of the soft start circuit of the present invention. The present embodiment proposes a soft start circuit, which includes: the power supply circuit comprises a power supply input end VDD, a power supply control end VDD _ EN, a power supply output end VDD _ OUT, an MOS tube P0 and a triode Q0, wherein the power supply input end VDD is connected with one end of a capacitor C0, one end of a resistor R0 and a source of the MOS tube P0, a drain of the MOS tube P0 is connected to the power supply output end VDD _ OUT, the other end of the capacitor C0, the other end of the resistor R0 and a gate of the MOS tube P0 are connected with one end of a resistor R1, the other end of the resistor R1 is connected to a collector of the triode Q0, the power supply control end VDD _ EN is connected to one end of a resistor R3 and a base of the triode Q0 through the resistor R2, and an emitter of the triode Q0 and the other end of the resistor R3 are grounded.

In this embodiment, Latch up Latch-up refers to that a parasitic thyristor structure (bipolar transistor) inherent in a CMOS circuit is triggered to be turned on, and a low-impedance large-current path exists between a power supply and ground, which causes the circuit to fail to work normally, even to burn out the circuit. As IC manufacturing processes have been developed, the packaging density and the integration degree have become higher and higher, and the possibility of generating Latch up has become higher and higher. The amount of excessive current generated by Latch up may cause permanent damage to the chip, and the protection of Latch up is one of the most important measures for IC Layout.

In the present embodiment, by proposing a soft start circuit, the circuit includes: the power supply circuit comprises a power supply input end VDD, a power supply control end VDD _ EN, a power supply output end VDD _ OUT, an MOS tube P0 and a triode Q0, wherein the power supply input end VDD is connected with one end of a capacitor C0, one end of a resistor R0 and a source of the MOS tube P0, a drain of the MOS tube P0 is connected to the power supply output end VDD _ OUT, the other end of the capacitor C0, the other end of the resistor R0 and a gate of the MOS tube P0 are connected with one end of a resistor R1, the other end of the resistor R1 is connected to a collector of the triode Q0, the power supply control end VDD _ EN is connected to one end of a resistor R3 and a base of the triode Q0 through the resistor R2, and an emitter of the triode Q0 and the other end of the resistor R3 are grounded. By properly debugging the rise time of the soft start circuit, the embodiment ensures that the voltage rise of the VDD does not influence the normal on-off of the screen, and ensures that the low-temperature screen-splash problem cannot occur. The low-temperature screen splash problem caused by the latch effect is effectively solved under the condition that the display IC circuit cannot be changed in the low-temperature state through self-designing the soft start circuit.

Example two

Fig. 4 is a second circuit diagram of a second embodiment of the soft start circuit of the present invention. Based on the above embodiments, please refer to the left soft start portion of fig. 4. Optionally, the on-resistance R of the MOS transistor P0_ONAnd the gate-source voltage V of the MOS transistor P0_GSIn an inversely proportional relationship, wherein,

Fig. 5 is a third circuit diagram of a second embodiment of the soft start circuit of the present invention. When the VDD is quickly electrified, the voltage of the point A cannot follow the VDD in time due to the rising of the voltage of the point A by the Rpwell/Cpwell, so that the P-N-P triode is conducted.

Fig. 6 is a fourth circuit diagram of a second embodiment of the soft start circuit of the present invention. After the P-N-P triode is conducted, a passage is formed between the P-N-P triode and the resistor R (pwell) to generate current IPNP, so that the voltage at the point B is gradually increased.

Fig. 7 is a fifth circuit diagram of a second embodiment of the soft start circuit of the present invention. With the gradual rise of the voltage at the point B, the grid voltage of the N-P-N triode gradually rises, so that the triode is gradually conducted, the voltage rise at the point A is restrained, the P-N-P triode cannot be closed, and the latch is formed.

It can be seen that when the temperature is lower, the parasitic capacitance effect of the triode is more obvious, the probability of latch-up is higher, the design of the magic red product is that the principle causes the low-temperature screen-splash phenomenon, and the current of the display IC is abnormal due to the fact that the P-N-P tube cannot be closed at the low temperature, so that the screen-splash phenomenon occurs in the display.

From the above analysis, the reason for the latch-up of the on-screen display circuit is that the P-N-P transistor cannot be turned off due to the voltage at the point a not immediately following the rapid rise of VDD. Therefore, one idea of this embodiment to solve this problem is to make the voltage rise at the point a follow the change of VDD, i.e. make the voltage at the point B keep the off state at this low temperature. Specifically, the present embodiment designs the soft start circuit for VDD, so that the voltage at the point a is kept at the rising amplitude of VDD. As described above, due to the design of the soft start circuit, the voltage rise of VDD _ OUT will become slow, so that the voltage at the point a will rise along with the slow rise of VDD _ OUT due to the charging speed of the parasitic capacitor in fig. 5, and thus the P _ N-P transistor will not be in the open state all the time, thereby eliminating the latch-up effect and the abnormal screen-splash phenomenon of the low-temperature screen body.

EXAMPLE III

It should be noted that the device embodiment and the circuit embodiment belong to the same concept, and specific implementation processes thereof are described in detail in the circuit embodiment, and technical features in the circuit embodiment are correspondingly applicable in the device embodiment, which is not described herein again.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A soft start circuit, comprising: the power supply circuit comprises a power supply input end VDD, a power supply control end VDD _ EN, a power supply output end VDD _ OUT, an MOS tube P0 and a triode Q0, wherein the power supply input end VDD is connected with one end of a capacitor C0, one end of a resistor R0 and a source of the MOS tube P0, a drain of the MOS tube P0 is connected to the power supply output end VDD _ OUT, the other end of the capacitor C0, the other end of the resistor R0 and a gate of the MOS tube P0 are connected with one end of a resistor R1, the other end of the resistor R1 is connected to a collector of the triode Q0, the power supply control end VDD _ EN is connected to one end of a resistor R3 and a base of the triode Q0 through the resistor R2, and an emitter of the triode Q0 and the other end of the resistor R3 are grounded.

2. The soft start circuit of claim 1, wherein the on-resistance R of the MOS transistor P0_ONAnd the gate-source voltage V of the MOS transistor P0_GSIn an inversely proportional relationship, wherein,

3. the soft-start circuit of claim 2, wherein the input voltage of the power supply control terminal VDD _ EN is controlled to gradually turn on the transistor Q0 to reduce the voltage at the collector of the transistor Q0.

4. The soft-start circuit of claim 3, wherein during the gradual conduction of the transistor Q0, the voltage of the capacitor C0 is discharged through the resistor R0, so that the voltage of the gate of the MOS transistor P0 is slowly decreased.

5. The soft-start circuit as claimed in claim 4, wherein the gate-source voltage V is controlled during the slow voltage drop of the gate of the MOS transistor P0_GSThe state of change of (c).

6. The soft-start circuit of claim 5, wherein the gate-source voltage V is based on_GSThe on-resistance of the MOS transistor P0 is controlled by the changing state of the voltage, so that the power output terminal VDD _ OUT does not change abruptly.

7. The soft-start circuit of claim 6, further comprising a latch-up circuit comprising a PNP transistor and a parasitic capacitor, wherein the power output VDD _ OUT is connected to a power input of the latch-up circuit.

8. The soft-start circuit of claim 7, wherein the charging state of the parasitic capacitor is controlled by controlling the rising state of the power output terminal VDD _ OUT.

9. The soft-start circuit of claim 7, wherein the charging state of the parasitic capacitor controls the voltage at the base of the PNP transistor to follow the slow rising of the power output terminal VDD _ OUT, so that the PNP transistor is always in an open state.

10. An apparatus, characterized in that it comprises a soft start circuit implementing any of claims 1 to 9.