Circuit and method for suppressing starting pulse current

Abstract

The invention relates to the technical field of starting pulse current suppression circuits, in particular to a circuit for suppressing starting pulse current, which comprises a current-limiting power supply circuit connected with a resistor and used for supplying power to a system when the system is initially powered on; the main working circuit controlled by the PMOS is in a closed state when the system is initially electrified, and is opened after a rear-end load main system stably works; according to the circuit and method for restraining the starting pulse current, the system can be started stably, and damage to main equipment or a power source is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of startup pulse current suppression circuits, and in particular to a circuit and method for suppressing startup pulse current. Background Art

[0002] The circuit for suppressing the starting pulse current is mainly designed to solve the current impact problem that may be faced when the electronic equipment starts. When the electronic equipment starts, due to the presence of the capacitor, the power supply will instantly charge the capacitor, thereby generating an impact current. This impact current may damage the electronic equipment or even cause failure. Therefore, in order to protect the electronic equipment from the damage of this impact current, a circuit for suppressing the starting pulse current is needed. The design principle of this circuit is mainly to reduce the impact of the impact current by limiting the instantaneous rate of change of the current. Specifically, it will limit the current through components such as current limiting resistors when the power supply starts, so as to avoid excessive instantaneous changes in the current. In addition, soft start technology can also be used to control the startup process of the power supply to further reduce the impact of the impact current. The circuit for suppressing the starting pulse current has been widely used in electronic equipment, especially in systems that require high reliability, such as communications, aerospace, medical and other fields. With the continuous development of electronic equipment, the protection requirements for circuits are getting higher and higher, so the design and implementation of the circuit for suppressing the starting pulse current is becoming more and more important. In short, the circuit for suppressing the starting pulse current is an important circuit design technology, and its background stems from the current impact problem that may be faced when electronic equipment starts. In order to protect electronic equipment from damage by this inrush current, components such as current limiting resistors and soft-start technology are needed to control the startup process of the power supply to reduce the impact of the inrush current.

[0003] At present, due to the capacitive load of the terminal device, when it is connected to the power supply or the main device, a short-term pulse current is often generated. Due to the existence of the pulse current, the power supply or the main device power protection may be triggered, the terminal device cannot be started, or the main device or the power supply is damaged. Therefore, in view of the above situation, it is urgent to develop a circuit and method for suppressing the startup pulse current to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The object of the present invention is to provide a circuit and method for suppressing a starting pulse current, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A circuit for suppressing a starting pulse current, the circuit for suppressing a starting pulse current comprising: A current-limiting power supply circuit, connected with a resistor, is used to supply power to the system when the system is first powered on; The main working circuit controlled by PMOS is in the closed state when the system is first powered on, and waits for the back-end load main system to work smoothly before opening; The control circuit is used to control the opening and closing of the main working circuit controlled by the PMOS.

[0006] As a further solution of the present invention: the resistor in the current limiting power supply circuit is used to suppress the starting pulse current.

[0007] A method for suppressing a starting pulse current is applied to the circuit for suppressing a starting pulse current as described above, and specifically comprises the following steps: (1) When the system is first powered on, power is supplied to the system through a current-limiting power supply circuit; (2) After waiting for the back-end load main system to work smoothly, the main working circuit controlled by the PMOS is turned on through the control circuit; (3) After the system is started up, switch to the main working circuit for power supply to eliminate the power loss of the initial startup circuit.

[0008] As a further solution of the present invention: in step (1), the starting pulse current is suppressed by a resistor in the current limiting power supply circuit.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In this system, two power supply circuits are set up, one is a current limiting circuit connected to a resistor, and the other is a main working circuit controlled by PMOS. When the system is first powered on, the PMOS circuit is in a closed state, and the system supplies power to the system through resistor current limiting. Due to the existence of the resistor, the pulse current will be effectively suppressed. After waiting for the back-end load main system to work smoothly, the MOS tube circuit is controlled and the main working circuit is turned on. After the above processing, the system can start smoothly to avoid damage to the main equipment or power supply, which is worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of power supply in an embodiment of the present invention. DETAILED DESCRIPTION

[0011] 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 described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0012] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0013] See also Figure 1, an embodiment of the present invention provides a circuit for suppressing a startup pulse current, the circuit for suppressing a startup pulse current comprising: A current-limiting power supply circuit, connected with a resistor, is used to supply power to the system when the system is first powered on; The main working circuit controlled by PMOS is in the closed state when the system is first powered on, and waits for the back-end load main system to work smoothly before opening; The control circuit is used to control the opening and closing of the main working circuit controlled by the PMOS.

[0014] Among them, the resistor in the current limiting power supply circuit is used to suppress the starting pulse current.

[0015] A method for suppressing a starting pulse current is applied to the circuit for suppressing a starting pulse current as described above, and specifically comprises the following steps: (1) When the system is first powered on, power is supplied to the system through a current-limiting power supply circuit; (2) After waiting for the back-end load main system to work smoothly, the main working circuit controlled by the PMOS is turned on through the control circuit; (3) After the system is started up, switch to the main working circuit for power supply to eliminate the power loss of the initial startup circuit.

[0016] Wherein, in step (1), the starting pulse current is suppressed by a resistor in a current limiting power supply circuit.

[0017] In this system, if Figure 1 As shown in the figure, there are two power supply circuits, one is a current limiting circuit connected with a resistor, and the other is a main working circuit controlled by PMOS. When the system is first powered on, the PMOS circuit is in a closed state, and the system supplies power to the system through resistor current limiting. Due to the existence of the resistor, the pulse current will be effectively suppressed. After waiting for the back-end load main system to work smoothly, the MOS tube circuit is controlled to open the main working circuit. Among them, changing the size of the R1 resistor can control the smoothness of the system power supply and the startup time.

[0018] After the above processing, the system can start smoothly and then switch to the main working circuit for power supply, eliminating the power loss of the initial startup circuit.

[0019] It should be noted that in the present invention, unless otherwise clearly specified and limited, the terms "slide", "rotate", "fix", "have" and the like should be understood in a broad sense, for example, it can be a welding connection, a bolt connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] 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 circuit for suppressing starting pulse current, characterized in that: The circuit for suppressing the starting pulse current comprises: A current-limiting power supply circuit, connected with a resistor, is used to supply power to the system when the system is first powered on; The main working circuit controlled by PMOS is in the closed state when the system is first powered on, and waits for the back-end load main system to work smoothly before opening; The control circuit is used to control the opening and closing of the main working circuit controlled by the PMOS.

2. The circuit for suppressing starting pulse current according to claim 1, characterized in that: The resistor in the current limiting power supply circuit is used to suppress the starting pulse current.

3. A method for suppressing a starting pulse current, applied to the circuit for suppressing a starting pulse current as claimed in claim 1 or 2, characterized in that: The specific steps include: (1) When the system is first powered on, power is supplied to the system through a current-limiting power supply circuit; (2) After waiting for the back-end load main system to work smoothly, the main working circuit controlled by the PMOS is turned on through the control circuit; (3) After the system is started up, switch to the main working circuit for power supply to eliminate the power loss of the initial startup circuit.

4. The method for suppressing starting pulse current according to claim 3, characterized in that: In step (1), the starting pulse current is suppressed by a resistor in the current limiting power supply circuit.

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