Pluggable power-on circuit and electronic equipment

Abstract

The invention provides a plugging power-on circuit and electronic equipment, and is applied to the technical field of plugging control. The charging control circuit comprises a plugging controller and a switching device, the plugging controller comprises a step power-on circuit formed by N steps of charging control circuits, and N is an integer greater than 1; the input end of the stepped power-on circuit is connected with the power supply end of the whole machine, and is used for outputting gradually increased voltage through the N-order charging control circuit in the power-on stage; the output end of the step power-on circuit serves as the output end of the plug controller and is connected with the control end of the switching device. Therefore, through the design that the voltage rises slowly in the step power-on circuit in a step mode and the design that different steps have certain buffering in the power-on stage of the step power-on circuit, it can be guaranteed that the voltage exists between the steps so that the voltage can be recovered. And therefore, the amplitude of instantaneous surge current generated when the power supply end of the whole machine performs plugging and unplugging actions can be suppressed, and meanwhile, the stability of voltage in the circuit can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of plug-in control, and in particular to a plug-in power-on circuit and electronic equipment. Background Art

[0002] In the field of electronic products, hot plugging, installation, removal and replacement of electronic equipment is a very efficient operation. When you need to add configuration, you can insert the required equipment into the machine without stopping the machine. When you need to reduce configuration, you can also unplug the device to be removed without stopping the machine. This operation is extremely easy to use and is widely used in hot plug scenarios.

[0003] However, in the hot-swap application of electronic equipment, in addition to the superficial actions of plugging and unplugging devices, the hardware circuit and other technical support are also required. In terms of power supply, forced plugging and unplugging will generate a large impact current and voltage fluctuation on the entire machine, which will cause voltage anomalies or power failures in the entire system, which may cause damage to electronic components in severe cases.

[0004] It can be seen that how to reduce the impact current and voltage fluctuation caused by the plugging and unplugging action on the whole machine is a problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a plug-in power-on circuit and an electronic device, which can solve the problem in the related art that the impact current and voltage fluctuation generated by the forced plug-in action cause voltage abnormality or power failure on the entire system.

[0006] To solve the above technical problems, on the one hand, an embodiment of the present invention provides a plug-in power-on circuit, comprising: a plug-in controller and a switch device, wherein the plug-in controller comprises a step power-on circuit composed of N-step charging control circuits, where N is an integer greater than 1;

[0007] The input end of the step power-on circuit is connected to the power supply end of the whole machine, and is used to output a gradually increasing voltage through the N-step charging control circuit during the power-on stage;

[0008] The output end of the step power-on circuit is connected to the control end of the switch device as the output end of the plug-in controller.

[0009] In some embodiments, the step power-up circuit includes: an N-step charging control circuit;

[0010] The first input terminal of each stage charging control circuit is connected to the power supply terminal of the whole machine;

[0011] The second input terminal of each stage charging control circuit is connected to the corresponding preset voltage source;

[0012] The third input terminal of the X-th order charging control circuit is connected to the output terminal of the corresponding X-th order signal control circuit, where X is an integer greater than 1 and less than or equal to N;

[0013] The output ends of the charging control circuits are commonly connected to the control end of the switch device as the output end of the step power-up circuit, and are used to output voltages corresponding to charging control circuits of different steps to the switch device.

[0014] In some embodiments, the plug-in controller further includes: a pre-power supply circuit;

[0015] The input end of the pre-power supply circuit is connected to the power supply end of the whole machine as the input end of the plug-in controller;

[0016] The output end of the pre-power supply circuit is connected to the input end of the ladder power-up circuit.

[0017] In some embodiments, the plug-in power-up circuit further comprises: a pull-down resistor;

[0018] The first end of the pull-down resistor is connected to the input end of the pre-power supply circuit and the power supply end of the whole machine;

[0019] The second end of the pull-down resistor is connected to ground.

[0020] In some embodiments, the charging control circuit includes: an operational amplifier, a first voltage-dividing resistor and a second voltage-dividing resistor;

[0021] The non-inverting input terminal of the operational amplifier is connected to the first end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor; when the charging control circuit is an X-order charging control circuit, the non-inverting input terminal of the operational amplifier, the first end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor are commonly connected to the output terminal of the corresponding X-order signal control circuit as the third input terminal of the X-order charging control circuit;

[0022] The inverting input terminal of the operational amplifier is connected to the corresponding preset voltage source as the second input terminal of the charging control circuit;

[0023] The output end of the operational amplifier is connected to the control end of the switch device as the output end of the charging control circuit;

[0024] The second end of the first voltage-dividing resistor is connected to the power supply end of the whole machine as the first input end of the charging control circuit;

[0025] The second end of the second voltage-dividing resistor is grounded.

[0026] In some embodiments, the step power-up circuit further includes: N-1 delay devices, each delay device corresponding to a non-first-step charging control circuit;

[0027] The first end of the delay device is connected to the first end of the first voltage-dividing resistor, the first end of the second voltage-dividing resistor and the output end of the corresponding X-th order signal control circuit;

[0028] The second terminal of the delay device is connected to the non-inverting input terminal of the operational amplifier.

[0029] In some embodiments, the X-th stage signal control circuit includes: X-1 first MOS transistors, and each first MOS transistor corresponds to the first X-1 stage charging control circuit respectively;

[0030] The gate of each first MOS tube is respectively connected to the output end of the corresponding first X-1 stage charging control circuit;

[0031] The drains of the first MOS tubes are connected to each other and serve as the output end of the X-th order signal control circuit and are connected to the third input end of the corresponding X-th order charging control circuit;

[0032] The source of each first MOS tube is grounded.

[0033] In some embodiments, the step power-up circuit further includes: a first drive circuit and a second drive circuit;

[0034] The input end of the first driving circuit is connected to the output end of each charging control circuit;

[0035] The output end of the first driving circuit is connected to the input end of the second driving circuit;

[0036] The output terminal of the second driving circuit is connected to the control terminal of the switching device.

[0037] In some embodiments, the first driving circuit includes: N second MOS transistors, each second MOS transistor corresponds to an N-stage charging control circuit;

[0038] The gate of each second MOS tube is respectively connected to the output end of the corresponding charging control circuit;

[0039] The drains of the second MOS tubes are connected to each other and are commonly connected to the input end of the second drive circuit as the output end of the first drive circuit;

[0040] The source of each second MOS tube is grounded.

[0041] In some embodiments, the second driving circuit includes: a third MOS transistor and a logic operation driving circuit;

[0042] The gate of the third MOS tube is connected to the output end of the first driving circuit as the input end of the second driving circuit;

[0043] The drain of the third MOS tube is connected to the first end of the logic operation driving circuit;

[0044] The source of the third MOS tube is grounded;

[0045] The second end of the logic operation driving circuit is connected to the control end of the switch device as the output end of the second driving circuit.

[0046] On the other hand, the present invention further provides an electronic device, comprising the above-mentioned plug-in power-on circuit.

[0047] It can be seen from the above technical scheme that the present invention provides a plug-in power-on circuit, including: a plug-in controller and a switch device, the plug-in controller includes a step power-on circuit composed of N-step charging control circuits, N is an integer greater than 1; the input end of the step power-on circuit is connected to the power supply end of the whole machine, and is used to output a gradually increasing voltage through the N-step charging control circuit during the power-on stage; the output end of the step power-on circuit is connected to the control end of the switching device as the output end of the plug-in controller. It can be seen that the present invention is designed to slowly step up the power supply voltage corresponding to the power supply end of the whole machine in the step power-on circuit, and there is a certain buffer design for different steps in the power-on stage of the step power-on circuit, so as to ensure that there is time between the steps for the power supply voltage to restore the voltage. In addition, the amplitude of the instantaneous surge current generated by the power supply end of the whole machine during the plug-in action is suppressed, and the voltage stability in the circuit is ensured at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A structural diagram of a plug-in power-on circuit provided in an embodiment of the present invention;

[0050] Figure 2 A circuit diagram of a hot-swap circuit in the related art;

[0051] Figure 3 A complete structural diagram of a plug-in power-on circuit provided by an embodiment of the present invention;

[0052] Figure 4 A circuit diagram of a first-order charging control circuit provided by an embodiment of the present invention;

[0053] Figure 5 A first circuit diagram of an X-th stage charging control circuit provided by an embodiment of the present invention;

[0054] Figure 6 A second circuit diagram of the X-th stage charging control circuit provided by an embodiment of the present invention;

[0055] Figure 7 A circuit diagram of an X-order signal control circuit provided by an embodiment of the present invention;

[0056] Figure 8 A circuit diagram of a first driving circuit and a second driving circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] 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.

[0058] The terms "including" and "having" in the specification of the present invention and the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0059] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0060] Next, a plug-in power-on circuit provided by an embodiment of the present invention is described in detail. Figure 1 A structural diagram of a plug-in power-on circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the plug-in power-on circuit includes: a plug-in controller 1, a switch device 2, and the plug-in controller 1 includes a step power-on circuit 3 composed of N-step charging control circuits. In addition, Figure 1 The structure diagram shown also includes: a whole machine power supply terminal 4 and a device power supply terminal 5. The connection relationship of the current plug-in power-on circuit is: the input end of the step power-on circuit 3 is connected to the whole machine power supply terminal 4; the output end of the step power-on circuit 3 is connected to the control end of the switch device 2 as the output end of the plug-in controller 1; the first end of the switch device 2 is connected to the whole machine power supply terminal 4, and the second end of the switch device 2 is connected to the device power supply terminal 5.

[0061] In the embodiment, the hot plug-in installation, removal and replacement of the electronic equipment is a very efficient operation. When the configuration needs to be increased, the required equipment can be inserted into the machine without stopping the machine, and when the configuration needs to be reduced, the equipment to be removed can be unplugged without stopping the machine. This operation is extremely easy to use and can be widely used in hot plug scenarios.

[0062] However, in the hot-swap application of electronic equipment, in addition to the superficial actions of plugging and unplugging devices, the hardware circuit and other technical support are also needed behind the scenes. The hot-swap circuit corresponding to the current electronic equipment is as follows Figure 2 As shown, it includes a voltage input terminal 21 (i.e., the power supply terminal of the whole machine), a voltage output terminal 22 (i.e., the power supply terminal of the equipment), a hot-swap current detection resistor Rsense, a hot-swap power switch Q1 (MOS tube) and a hot-swap controller 23 (e.g., hot-plugging / Hot Swap, HSC), and a capacitive load C. Figure 2 The connection relationship of the hot-swap circuit shown is as follows: the voltage input terminal 21 is connected to the first end of the hot-swap current detection resistor Rsense and the first detection pin of the controller 23, so as to send the current Isnese+ of the current node to the controller 23; the second end of the hot-swap current detection resistor Rsense is connected to the second detection pin of the controller 23 and the first end of the hot-swap power switch Q1 (the drain of the MOS tube), so as to send the current Isnese- of the current node to the controller 23. At the same time, the current node is also connected to the power supply pin of the controller 23, so as to send the voltage VCC of the current node to the controller 23; the control pin of the controller 23 is connected to the control end (the gate of the MOS tube) of the hot-swap power switch Q1, so as to send the driving signal Gate; the second end (the source of the MOS tube) of the hot-swap power switch Q1 is connected to the voltage output terminal 22 and the first end of the capacitive load C; the second end of the capacitive load C is grounded.

[0063] The working principle of the current hot-swap circuit is: when a device is inserted into the system, it will first be connected to the power supply part of the system, and after the power supply is completed, it will be connected to the management and signal part. When connected to the power supply part, the inserted device will cause fluctuations in the stable power supply of the system. The reason is the surge current and the voltage fluctuation caused by the instantaneous charging of capacitive loads such as capacitors in the device and electronic devices that need electricity. That is, at the moment when the hot-swap power switch Q1 is turned on, the current in its circuit will flow into the plug-in device through the hot-swap power switch Q1.

[0064] Among them, the formula for capacitor charging is: C1*V1=I*t;

[0065] Wherein, C1 is the equivalent capacitance corresponding to the capacitive load C, V1 is the voltage value to which the capacitive load C is charged, I is the charging current, and t is the charging time, which is the time from when the controller 23 controls the hot-swap power switch Q1 to turn on until the device is powered on.

[0066] Taking a 12V server node as an example, the amount of electricity charged from the moment the node is inserted into the whole machine to the moment it is powered on is certain, but the instantaneous current size cannot be controlled. The main reason is that at the moment the device contacts the whole machine, we cannot guarantee that their contact points, insertion force and trajectory are exactly the same each time. Therefore, there is a large instantaneous surge current when power is turned on, and for devices with large capacitive loads C, the instantaneous surge current is also relatively large. The large current change will cause voltage fluctuations due to the presence of inductance in the circuit transmission path and the influence of capacitive load voltage rebound, thereby affecting the whole machine.

[0067] Therefore, in summary, the present invention provides a plug-in power-on circuit. In the plug-in power-on circuit, it is specifically divided into two parts, namely a plug-in controller 1 and a switch device 2. The plug-in controller 1 includes a step power-on circuit 3. It can also be understood that the step power-on circuit 3 is integrated in the plug-in controller 1 and can be regarded as a whole. The input end of the step power-on circuit 3 is connected to the power supply end 4 of the whole machine. Since the step power-on circuit 3 includes an N-stage charging control circuit, the power supply voltage V corresponding to the power supply end 4 of the whole machine outputs different voltages in the charging control circuits of different stages, that is, the step power-on circuit 3 is used to output a gradually increasing voltage through the N-stage charging control circuit during the power-on stage. The output end of the step power-on circuit 3 is connected to the control end of the switch device 2 as the output end of the plug-in controller 1, and is used to output the corresponding voltage to the control end of the switch device 2, so that the switch device 2 determines whether to be turned on according to the voltage obtained at the control end. The first end of the switch device 2 is connected to the whole machine power supply terminal 4, and the second end of the switch device 2 is connected to the equipment power supply terminal 5. That is to say, the switch device 2 realizes the connection between the whole machine power supply terminal 4 and the equipment power supply terminal 5. When the switch device 2 is turned on, the whole machine power supply terminal 4 is connected with the equipment power supply terminal 5, the whole machine power supply terminal 4 supplies power to the equipment power supply terminal 5, and the equipment corresponding to the equipment power supply terminal 5 is powered on successfully; when the switch device 2 is turned off, the whole machine power supply terminal 4 is not connected with the equipment power supply terminal 5, then the whole machine power supply terminal 4 cannot supply power to the equipment power supply terminal 5, and the equipment corresponding to the equipment power supply terminal 5 fails to power on.

[0068] Among them, since the step power-on circuit 3 includes N-step charging control circuits, but the specific connection relationship is not limited, the step power-on circuit 3 will adopt the working principle of the step power-on design and is divided into two types:

[0069] The first method is to obtain the power supply voltage corresponding to the current power supply terminal 4 of the whole machine, and divide it into steps (for example, the 12V power supply voltage is divided into 2V-4V-6V-8V-10-12V). Therefore, the voltages under different step divisions correspond to the current order of the charging control circuit. That is to say, when the input end of the first-stage (first-stage) charging control circuit is the power supply voltage (for example: 12V), the voltage output by the current power supply voltage after passing through the first-stage (first-stage) charging control circuit is the voltage divided by the first step (for example: 2V), that is, the voltage step change after the first-stage charging control circuit is: 0V-2V (0V is the voltage before conduction); after passing through the first-stage charging control circuit, the first-stage charging control circuit will send a corresponding signal or other controllers will send a corresponding signal to trigger the second-stage charging control circuit to work normally, and the input end of the second-stage charging control circuit is the power supply voltage (for example: 12V), and the voltage output by the current power supply voltage after passing through the second-stage charging control circuit is the voltage divided by the second step (for example: 4V), that is, the voltage step change after passing through the second-stage charging control circuit is: 0V-2V-4V. This process is repeated continuously until the voltage outputted by the output end of the last-stage charging control circuit is the supply voltage, and the current voltage step change is: 0V-2V-4V-6V-8V-10V-12V. At this time, the step power-on circuit 3 completes the step power-on of the supply voltage.

[0070] The second method: obtain the power supply voltage corresponding to the current power supply terminal 4 of the whole machine, and divide it in a step form (for example: the 12V power supply voltage is divided into: 2V-4V-6V-8V-10-12V). The structure of its current N-stage charging control circuit is exactly the same. Take the first-stage (first-stage) charging control circuit as an example: when the input end of the first-stage (first-stage) charging control circuit is the power supply voltage (for example: 12V), the current power supply voltage outputs the first output voltage (for example: 2V) after passing through the first-stage (first-stage) charging control circuit, that is, the voltage step change after the first-stage charging control circuit is: 0V-2V. The voltages output by the first two-stage charging control circuits are added together, and the voltage step change is: 0V-2V-4V; the voltages output by the first three-stage charging control circuits are added together, and the voltage step change is: 0V-2V-4V-6V. This process is repeated until the voltage output by the last voltage addition is the supply voltage, and the current voltage step change is: 0V-2V-4V-6V-8V-10V-12V. At this time, the step power-on circuit 3 completes the step power-on of the supply voltage.

[0071] It should be noted that the two working principles provided in the embodiment of the present invention are only one possible implementation method, but are not limited to only two implementation methods and can be set according to user needs.

[0072] It should be noted that the switch device 2 can be a MOS tube. When the switch device 2 is specifically a MOS tube, the gate of the MOS tube serves as the control end of the switch device 2, the drain of the MOS tube serves as the first end of the switch device, and the source of the MOS tube serves as the second end of the switch device.

[0073] It can be seen from the above technical scheme that the present invention provides a plug-in power-on circuit, including: a plug-in controller and a switch device, the plug-in controller includes a step power-on circuit composed of N-step charging control circuits, N is an integer greater than 1; the input end of the step power-on circuit is connected to the power supply end of the whole machine, and is used to output a gradually increasing voltage through the N-step charging control circuit during the power-on stage; the output end of the step power-on circuit is connected to the control end of the switching device as the output end of the plug-in controller. It can be seen that the present invention is designed to slowly step up the power supply voltage corresponding to the power supply end of the whole machine in the step power-on circuit, and there is a certain buffer design for different steps in the power-on stage of the step power-on circuit, so as to ensure that there is time between the steps for the power supply voltage to restore the voltage. In addition, the amplitude of the instantaneous surge current generated by the power supply end of the whole machine during the plug-in action is suppressed, and the voltage stability in the circuit is ensured at the same time.

[0074] In some embodiments, Figure 3 As shown, the plug-in controller 1 in the plug-in power-on circuit provided by the present invention also includes a pre-power supply circuit 6. The plug-in power-on circuit also includes: a pull-down resistor R. Figure 3 The connection relationship of the plug-in power-on circuit shown is as follows: the input end of the pre-power supply circuit 6 is connected to the first end of the pull-down resistor R and the whole machine power supply end 4 as the input end of the plug-in controller 1, the output end of the pre-power supply circuit 6 is connected to the input end of the step power-on circuit 3, and the second end of the pull-down resistor R is grounded; the output end of the step power-on circuit 3 is connected to the control end of the switch device 2 as the output end of the plug-in controller 1; the first end of the switch device 2 is connected to the whole machine power supply end 4, and the second end of the switch device 2 is connected to the equipment power supply end 5.

[0075] In the embodiment, it should also be noted that the step power-on circuit 3 and the pre-power supply circuit 6 are integrated in the plug-in controller 1, and can be regarded as a whole. Therefore, in this whole, the pre-power supply circuit 6 serves as the input end of the plug-in controller 1 to obtain the power supply voltage. After obtaining the power supply voltage, the pre-power supply circuit 6 sends the collected power supply voltage to the plug-in controller 1 after self-processing. In other words, the pre-power supply circuit 6 is the starting working power supply provided by the plug-in controller 1. Since the current required for the operation of the plug-in controller 1 is very small, the current provided by the added pre-power supply circuit 6 is also very small, and thus the surge current generated during the hot plug action is extremely small, and the impact caused can be ignored. At the same time, the pre-power supply circuit 6 sends the obtained voltage to the step power-on circuit 3, so that the step power-on circuit 3 can realize the design of voltage step power-on.

[0076] At the same time, the plug-in power-on circuit provided by the present invention also includes a pull-down resistor R, and the pull-down resistor R is connected to the input end of the pre-power supply circuit 6 and the ground, which ensures that the pin state specifically connected to the pull-down resistor R in the input end of the current pre-power supply circuit 6 is in a low level state by default, so when the hot-swappable device is inserted into the system, it will not be powered on immediately.

[0077] It should be noted that the embodiment provided by the present invention is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0078] The present invention provides a specific structure of a plug-in power-on circuit, in which the surge current generated during hot plugging is further reduced through a pre-power supply circuit and a pull-down resistor, while delaying the power-on time of the hot plug device.

[0079] In some embodiments, the step power-on circuit 3 provided by the present invention includes: an N-step charging control circuit. The connection relationship of the N-step charging control circuits in the step power-on circuit 3 is as follows: the first input end of each step charging control circuit is connected to the power supply end of the whole machine; the second input end of each step charging control circuit is connected to the corresponding preset voltage source; the third input end of the X-th step charging control circuit is connected to the output end of the corresponding X-th step signal control circuit, where X is an integer greater than 1 and less than or equal to N; the output end of each charging control circuit is commonly connected to the control end of the switch device 2 as the output end of the step power-on circuit 3.

[0080] In the embodiment, that is to say, for the first-stage charging control circuit, it has two input terminals, the first input terminal of the first-stage charging control circuit is connected to the power supply terminal 4 of the whole machine, and the second input terminal is connected to the corresponding preset voltage source, and the first-stage charging control circuit realizes the first step power-on of the power supply voltage according to the voltages at the two input terminals.

[0081] However, for the second-order charging control circuit - the Nth-order charging control circuit, it has three input terminals, the first input terminal of the current charging control circuit is connected to the whole machine power supply terminal 4, the second input terminal is connected to the corresponding preset voltage source, and the third input terminal is connected to the output terminal of the corresponding signal control circuit. It determines whether to trigger the current-order charging control circuit according to the signal output from the output terminal of the signal control circuit. Only when the current-order charging control circuit is triggered, it realizes the current-order step power-up of the power supply voltage according to the voltage at the two input terminals.

[0082] Further, if Figure 4As shown, its first-order charging control circuit includes: an operational amplifier U1, a first voltage-dividing resistor R1U and a second voltage-dividing resistor R1D. The connection relationship of its current control circuit is: the non-inverting input terminal of the operational amplifier U1 is connected to the first end of the first voltage-dividing resistor R1U and the first end of the second voltage-dividing resistor R1D; the inverting input terminal of the operational amplifier U1 is connected to the corresponding preset voltage source 31 as the second input terminal of the charging control circuit; the output terminal of the operational amplifier U1 is connected to the control terminal of the switch device 2 as the output terminal of the charging control circuit, and outputs a signal 1D; the second end of the first voltage-dividing resistor R1U is connected to the power supply terminal 4 of the whole machine as the first input terminal of the charging control circuit, for obtaining the power supply voltage V; the second end of the second voltage-dividing resistor R1D is grounded.

[0083] Further, if Figure 5 As shown, the X-th order (second order - N-th order) charging control circuit includes: an operational amplifier UX (U2-UN), a first voltage-dividing resistor RXU (R2U-RNU) and a second voltage-dividing resistor RXD (R2D-RND). The connection relationship of the current control circuit is as follows: the non-inverting input terminal of the operational amplifier UX is connected to the first end of the first voltage-dividing resistor RXU and the first end of the second voltage-dividing resistor RXD. At the same time, the non-inverting input terminal of the operational amplifier UX, the first end of the first voltage-dividing resistor RXU and the second voltage-dividing voltage RXD are connected together as the third input terminal of the X-th order charging control circuit and the output terminal of the corresponding X-th order signal control circuit, for obtaining the signal XI (2I-NI); the inverting input terminal of the operational amplifier UX is connected to the corresponding preset voltage source 3X (32-3N) as the second input terminal of the charging control circuit; the output terminal of the operational amplifier UX is connected to the control terminal of the switching device 2 as the output terminal of the charging control circuit, and outputs the signal XD (2D-ND); the second end of the first voltage-dividing resistor RXU is connected to the whole machine power supply terminal 4 as the first input terminal of the charging control circuit, for obtaining the voltage V; the second end of the second voltage-dividing resistor RXD is grounded.

[0084] It should be noted that the current ladder power-on circuit structure corresponds to the first type of ladder power-on design mentioned in the above embodiment.

[0085] In a specific embodiment, whether it is the first-order charging control circuit or the X-th order (second-order-N-th order) charging control circuit, its second voltage-dividing resistors R1D-RND can be resistors of the same resistance value. The first-order charging control circuit to the X-th order (second-order-N-th order) charging control circuit is a step circuit design, so the resistance values ​​corresponding to the first voltage-dividing resistors R1U-RNU can be selected according to the corresponding proportion. At the same time, it should be noted that the preset voltage values ​​corresponding to the preset voltage sources 31-3N connected to the different order charging control circuits are different, so as to ensure that the target voltages of the corresponding steps are output by the different order charging control circuits.

[0086] In addition, in the design of the step power-on circuit 3, in order to ensure that there is a certain buffer between different steps in the power-on stage of the step power-on circuit 3, a delay device 7 is provided in the Xth step (second step to Nth step) charging control circuit. Figure 6 As shown, the first end of the delay device 7 is connected to the first end of the first voltage-dividing resistor RXU (R2U-RNU), the first end of the second voltage-dividing resistor RXD (R2D-RND) and the output end of the corresponding X-order signal control circuit to obtain the signal XI; the second end of the delay device 7 is connected to the non-inverting input end of the operational amplifier UX (U2-UN).

[0087] Among them, since the delay device 7 is included only in the non-first-stage charging control circuit, for the step power-on circuit 3, it specifically includes N-1 delay devices.

[0088] In addition, since the signals (1D-ND) outputted from the output ends of the charging control circuits of each stage in the current design all act on the switching device 2, the signals finally obtained by the switching device 2 are prone to conflict. Therefore, in the step power-on circuit 3, the structure of the signal control circuit connected to the third input end of the X-th stage (second stage-N-th stage) charging control circuit and sending the corresponding signal XI (2I-NI) to the X-th stage (second stage-N-th stage) charging control circuit and the source of the input signal of the signal control circuit are specifically defined.

[0089] Take the X-order signal control circuit (its signal control circuit can also be understood as a mutually exclusive circuit) as an example. Figure 7 As shown, it includes: X-1 first MOS transistors Q1X (Q11-Q1(X-1)), and each first MOS transistor Q1X corresponds to the first X-1 stage charging control circuit respectively; the gate of each first MOS transistor Q1X is connected to the output end of the corresponding first X-1 stage charging control circuit respectively, for obtaining the corresponding signal (1D-(X-1)D); the drain of each first MOS transistor Q1X is connected, and is commonly connected to the third input end of the corresponding X-stage charging control circuit as the output end of the X-stage signal control circuit, for outputting the corresponding signal XI (2I-NI); the source of each first MOS transistor Q1X is grounded.

[0090] It can be seen from this that when the signals (1D-(X-1)D) corresponding to the current X-1th order charging control circuit are all low-level signals, the voltage value corresponding to its output signal XI (2I-NI) is the voltage-dividing value of the first voltage-dividing resistor RXU and the second voltage-dividing resistor RXD in the Xth order charging control circuit.

[0091] For example: Take a two-stage charging control circuit as an example: the output signal 1D of the first-stage charging control circuit controls the input signal 2I of the second-stage charging control circuit through the MOS tube Q11. When 1D is a high-level signal, its 2I is a low-level signal. When 1D is a low-level signal, the voltage value corresponding to 2I is the voltage-dividing value of the first voltage-dividing resistor R2U and the second voltage-dividing resistor R2D.

[0092] Take the three-stage charging control circuit as an example: when any one of the first-stage charging control circuit output signal 1D and the second-stage charging control circuit output signal 2D is at a high level, its signal 3I is a low-level signal; only when the current signals 1D and 2D are both low-level signals, the voltage value corresponding to its signal 3I is the voltage-dividing value of the first voltage-dividing resistor R3U and the second voltage-dividing resistor R3D.

[0093] In summary, it can be determined that when looking from the high-order charging control circuit to the low-order charging control circuit, when the high-order charging control circuit is working, the voltage corresponding to its output signal has exceeded the designed voltage divider value of the resistors before the working stage. At the same time, based on the working principle of the operational amplifier, it is known that all the corresponding step output signals before the current-order charging control circuit are low-level signals.

[0094] It should be noted that the embodiment provided by the present invention is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0095] In the overall design of the step power-on circuit provided by the present invention, in addition to including the N-stage charging control circuit, a delay device is added to the design of the non-first-stage charging control circuit, and the source of the signal input in the signal control circuit is also limited. The delay device can ensure that there is a certain buffer between different steps in the power-on stage of the step power-on circuit 3, and limiting the source of the signal input in the signal control circuit can ensure that in the N-stage charging control circuit, only the signal output by the first-stage charging control circuit acts on the switching device, further ensuring the stable operation of the circuit.

[0096] In some embodiments, in the design of the step power-up circuit 3, it further includes: a first drive circuit and a second drive circuit, wherein the input end of the first drive circuit is connected to the output end of each charging control circuit;

[0097] The output end of the first driving circuit is connected to the input end of the second driving circuit; the output end of the second driving circuit is connected to the control end of the switching device.

[0098] like Figure 8As shown, the first driving circuit includes: N second MOS tubes (Q21-Q2N), each of which corresponds to an N-stage charging control circuit; the gate of each second MOS tube (Q21-Q2N) is connected to the output end of the corresponding charging control circuit, and respectively obtains the signal 1D-ND output by the corresponding order charging control circuit; the drain of each second MOS tube is connected, and is commonly connected to the input end of the second driving circuit as the output end of the first driving circuit; the source of each second MOS tube (Q21-Q2N) is grounded.

[0099] and Figure 8 In the circuit shown, the second driving circuit includes: a third MOS transistor Q3 and a logic operation driving circuit 8. The gate of the third MOS transistor Q3 is connected to the output end of the first driving circuit as the input end of the second driving circuit; the drain of the third MOS transistor is connected to the first end of the logic operation driving circuit 8; the source of the third MOS transistor is grounded; the second end of the logic operation driving circuit 8 is connected to the control end of the switch device 3 as the output end of the second driving circuit, and outputs a signal Gate.

[0100] In an embodiment, by Figure 8 It can be seen that among the output signals 1D-ND of each stage charging control circuit, when all signals are low-level signals, the corresponding second MOS tube (Q21-Q2N) and the third MOS tube Q3 control the logic operation driving circuit 8 to output a low-level signal, and the driver does not generate a Gate signal at this time, and the switch device 3 is in a closed state. When one of the output signals 1D-ND of each stage charging control circuit is a high-level signal, the corresponding second MOS tube (Q21-Q2N) and the third MOS tube Q3 control the logic operation driving circuit 8 to output a high-level signal, and the driver generates a Gate signal at this time, and the switch device 3 is in a conducting state, and the inserted device is in a charging state at this time.

[0101] It can be seen that the plug-in power-on circuit provided by the present invention has the following advantages:

[0102] 1. Introduce a pre-power supply circuit so that the operation of the plug-in controller is controlled at the moment of plugging and unplugging the device, and no large surge current is generated.

[0103] 2. Introduce a pull-down resistor to achieve a preset low level (the pin state connected to the pull-down resistor R is in a low level state by default), providing a prerequisite for step power-on.

[0104] 3. The target voltage corresponding to the step power-on circuit is introduced to make the charging voltage range and target voltage of each step controllable.

[0105] 4. Introduce a mutually exclusive circuit so that only one group of the N-stage charging control circuit works, and the problem of multiple steps being driven simultaneously will not occur.

[0106] 5. Add a step signal delay design (delay device) to allow time for the voltage to stabilize between step charges.

[0107] 6. Introduce OR logic (the first drive circuit and the second drive circuit) to ensure that when any step charging control circuit is working, the Gate signal output can be realized, thereby controlling the switch device to conduct.

[0108] 7. Through the above design, the purpose of suppressing the large surge current when the hot-swappable device is inserted into the system is achieved, and the stability of the system power supply voltage is guaranteed when the hot-swappable device is plugged into the system.

[0109] On the other hand, the present invention further provides an electronic device, comprising the above-mentioned plug-in power-on circuit, and having the same beneficial effects.

[0110] Since the embodiment of the electronic device provided by the present invention is the same as the embodiment of the plug-and-unplug power-on circuit described above, the present invention will not be described in detail herein.

[0111] The above is a detailed introduction to a plug-in power-on circuit and an electronic device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A plug-in power-on circuit, characterized in that: include: A plug-in controller and a switch device, wherein the plug-in controller includes a step-up power-on circuit composed of N-step charging control circuits, where N is an integer greater than 1; The input end of the step power-on circuit is connected to the power supply end of the whole machine, and is used to output a gradually increasing voltage through the N-step charging control circuit during the power-on stage; The output end of the step power-up circuit is connected to the control end of the switch device as the output end of the plug-in controller.

2. The plug-in power-on circuit according to claim 1, characterized in that: The step power-on circuit comprises: the charging control circuit of step N; The first input terminal of the charging control circuit of each stage is connected to the power supply terminal of the whole machine; The second input terminal of the charging control circuit of each stage is connected to the corresponding preset voltage source; The third input terminal of the X-th stage charging control circuit is connected to the output terminal of the corresponding X-th stage signal control circuit, where X is an integer greater than 1 and less than or equal to N; The output end of each charging control circuit is commonly connected to the control end of the switching device as the output end of the step power-up circuit, and is used to output voltages corresponding to the charging control circuits of different steps to the switching device.

3. The plug-in power-on circuit according to claim 1, characterized in that: The plug-in controller further includes: a pre-power supply circuit; The input end of the pre-power supply circuit is connected to the power supply end of the whole machine as the input end of the plug-in controller; The output end of the pre-power supply circuit is connected to the input end of the step power-up circuit.

4. The plug-in power-on circuit according to claim 3, characterized in that: Also includes: Pull-down resistor; The first end of the pull-down resistor is connected to the input end of the pre-power supply circuit and the whole machine power supply end; The second end of the pull-down resistor is grounded.

5. The plug-in power-on circuit according to claim 2, characterized in that: The charging control circuit comprises: an operational amplifier, a first voltage-dividing resistor and a second voltage-dividing resistor; The non-inverting input terminal of the operational amplifier is connected to the first end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor; when the charging control circuit is the charging control circuit of the Xth stage, the non-inverting input terminal of the operational amplifier, the first end of the first voltage-dividing resistor and the first end of the second voltage-dividing resistor are commonly connected to the output terminal of the corresponding Xth stage signal control circuit as the third input terminal of the Xth stage charging control circuit; The inverting input terminal of the operational amplifier is connected to the corresponding preset voltage source as the second input terminal of the charging control circuit; The output end of the operational amplifier is connected to the control end of the switch device as the output end of the charging control circuit; The second end of the first voltage-dividing resistor is connected to the power supply end of the whole machine as the first input end of the charging control circuit; The second end of the second voltage-dividing resistor is grounded.

6. The plug-in power-on circuit according to claim 5, characterized in that: The step power-on circuit further includes: N-1 delay devices, each of which corresponds to the non-first-stage charging control circuit; The first end of the delay device is connected to the first end of the first voltage-dividing resistor, the first end of the second voltage-dividing resistor and the output end of the corresponding X-th order signal control circuit; The second end of the delay device is connected to the non-inverting input end of the operational amplifier.

7. The plug-in power-on circuit according to claim 2, characterized in that: The signal control circuit of the Xth stage comprises: X-1 first MOS transistors, and each of the first MOS transistors corresponds to the charging control circuit of the previous X-1 stages; The gate of each of the first MOS tubes is respectively connected to the output end of the corresponding first X-1 stages of the charging control circuit; The drains of the first MOS transistors are connected to each other and serve as the output end of the signal control circuit of the Xth stage and are connected to the third input end of the corresponding charging control circuit of the Xth stage; The source of each of the first MOS tubes is grounded.

8. The plug-in power-on circuit according to any one of claims 2 to 7, characterized in that: The step power-on circuit further includes: a first drive circuit and a second drive circuit; The input end of the first driving circuit is connected to the output end of each of the charging control circuits; The output end of the first driving circuit is connected to the input end of the second driving circuit; The output terminal of the second driving circuit is connected to the control terminal of the switching device.

9. The plug-in power-on circuit according to claim 8, characterized in that: The first driving circuit includes: N second MOS transistors, each of which corresponds to the N-stage charging control circuit; The gate of each of the second MOS tubes is respectively connected to the output end of the corresponding charging control circuit; The drains of the second MOS transistors are connected to each other and are commonly connected to the input end of the second drive circuit as the output end of the first drive circuit; The source of each of the second MOS tubes is grounded; The second driving circuit includes: a third MOS tube and a logic operation driving circuit; The gate of the third MOS transistor is connected to the output end of the first driving circuit as the input end of the second driving circuit; The drain of the third MOS tube is connected to the first end of the logic operation driving circuit; The source of the third MOS tube is grounded; The second end of the logic operation driving circuit is connected to the control end of the switching device as the output end of the second driving circuit.

10. An electronic device, characterized in that: The invention comprises the plug-in power-on circuit as described in any one of claims 1 to 9.

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