A power-on and power-off delay circuit for a combined power supply

Abstract

The present invention discloses a power-on and power-off delay circuit of a combined power supply, which belongs to the field of circuit control and includes: an MCU controller for collecting status signals and controlling circuits; a plurality of power modules for power control; each power module is provided with a corresponding enabling module, and the enabling module is used to control the action of the power module. The present invention can realize precise control of a plurality of power modules by collecting status signals and controlling circuits through the MCU controller. Each power module is equipped with a corresponding enabling module, which ensures that each power module can be started or shut down independently and in sequence as needed, thereby improving the flexibility and reliability of the system and reducing the risk of impact current that may be caused by the simultaneous operation of multiple power supply systems.

Description

Technical Field

[0001] The invention belongs to the field of circuit control, and in particular relates to a power-on and power-off delay circuit of a combined power supply. Background Art

[0002] In modern electronic equipment, combined power systems are widely used because they can provide multiple voltage outputs, enhanced reliability and flexibility. Especially in applications with high complexity, such as servers, communication base stations, industrial control and other environments, a well-designed combined power system is essential to ensure the stable operation of the system.

[0003] Switching power supplies often use multi-channel combined power supplies to provide a stable secondary power supply for the power supply system. The combined power supply includes multi-channel power modules. When the multi-channel power modules are in parallel working state and are started at the same time, the combined power bus current will be large. If the power supply capacity of the primary power supply is insufficient, the bus voltage will be pulled down, triggering the undervoltage protection function of the multi-channel power module, causing the multi-channel combined power supply to work abnormally and unable to provide a stable working voltage for the subsequent system. Therefore, the multi-channel power modules need to be powered on in sequence. For example, a Chinese patent with announcement number CN112015114B discloses a multi-channel power supply timing automatic control circuit, which includes a power supply power-on circuit, N power supply chips and N-1 enable signal generating circuits; when the initial voltage POWER ON is powered on, an enable signal POWER_EN_1 is generated, and the enable signal POWER_EN_1 drives the power supply chip 1 to output voltage POWER 1; the voltage POWER1 is input to the first enable signal generating circuit, the first enable signal generating circuit generates an enable signal POWER_EN_2, and the enable signal POWER_EN_2 drives the power supply chip 2 to output voltage POWER 2, and so on, the N-1th enable signal generating circuit generates an enable signal POWER_EN_N, and the enable signal POWER_EN_N drives the power supply chip N to output voltage POWERN.

[0004] However, these power control functions are also combined with each other to achieve power-on and power-off timing control. If the combined power protection function is triggered, the power module must still ensure power supply to the specific unit, so multiple power modules cannot be powered off in sequence.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a power-on and power-off delay circuit for a combined power supply.

[0007] To achieve the above object, the technical solution of the present invention is: A power-on and power-off delay circuit for a combined power supply, comprising: MCU controller, used to collect status signals and control circuits; Multiple power modules for power control; Each power module is provided with a corresponding enabling module, and the enabling module is used to control the action of the power module; The MCU controller is provided with a timer for setting the time interval of powering on and / or powering off the power module; The MCU controller includes an input end and an output end, the input end collects power-on, power-off and protection signals, and the output end outputs a TTL control signal. Each of the power modules is set to a parallel input and isolated output connection mode.

[0008] Preferably, the protection signal includes an over-current protection signal, an over-voltage protection signal and an over-temperature protection signal.

[0009] Preferably, each power module is provided with an input terminal, an output terminal and an enable terminal Enable.

[0010] Preferably, the enabling module is an enabling circuit, including a VCC power supply, a resistor R1, a resistor R2, a capacitor C and a MOS tube Q; The output end of the MCU controller outputs a control signal CTRL to form a control end, and the control end is connected to a MOS tube Q through resistors R1 and R2, and the MOS tube Q is connected to an enable end Enable of a power module.

[0011] Preferably, N power modules and N enabling circuits are provided, and the enabling circuits are provided corresponding to the power modules.

[0012] Preferably, the resistance values ​​of the resistor R1 and the resistor R2 satisfy: VCC×R2 / (R1+R2)>Vth_Q, where Vth_Q is the turn-on voltage of the MOS tube Q.

[0013] After adopting the above technical solution, the power-on and power-off delay circuit of a combined power supply provided by the present invention has the following beneficial effects compared with the prior art.

[0014] 1. The present invention can realize precise control of multiple power modules by collecting status signals and controlling circuits through the MCU controller. Each power module is equipped with a corresponding enabling module, which ensures that each power module can be started or shut down independently and in sequence as needed, improves the flexibility and reliability of the system, and reduces the risk of impact current caused by the simultaneous operation of multiple power systems.

[0015] 2. The present invention can set the time interval for powering on and / or off the power module by setting a timer, which not only helps to avoid transient problems (such as voltage spikes) that may occur during power switching, but also protects connected devices from sudden power outages and extends their service life.

[0016] 3. The present invention provides independent input terminals, output terminals and enable terminals for each power module, so that the power modules can be individually controlled and monitored, which is convenient for troubleshooting and maintenance, and also increases the flexibility of system design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings: Figure 1 It is a schematic diagram of the power-on timing of the present invention; Figure 2 It is a schematic diagram of MCU signal acquisition of the present invention; Figure 3 It is a schematic diagram of the MCU program execution flow of the present invention; Figure 4 It is a schematic diagram of a combination circuit of the present invention.

[0018] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0019] like Figures 1 to 4 As shown, the present invention provides a power-on and power-off delay circuit of a combined power supply, comprising: MCU controller, used to collect status signals and control circuits; Multiple power modules for power control; Each power module is provided with a corresponding enabling module, which is used to control the action of the power module. The MCU controller collects status signals and controls the circuit, so that precise control of multiple power modules can be achieved. Each power module is equipped with a corresponding enabling module, which ensures that each power module can be started or shut down independently and in sequence as needed, improving the flexibility and reliability of the system and reducing the risk of inrush current caused by the simultaneous operation of multiple power systems.

[0020] The MCU controller is provided with a timer for setting the time interval of powering on and / or powering off the power module.

[0021] By setting the timer, you can set the time interval for powering on and / or off the power module, which not only helps to avoid transient problems (such as voltage spikes) that may occur during power switching, but also protects connected devices from sudden power outages and extends their service life.

[0022] Preferably, the MCU controller includes an input end and an output end, the input end collects power-on, power-off and protection signals, the output end outputs a TTL control signal, and each of the power modules is set to a parallel input and isolated output connection mode.

[0023] The protection signal includes an over-current protection signal, an over-voltage protection signal and an over-temperature protection signal.

[0024] Each power module is equipped with an input terminal, an output terminal and an enable terminal. By setting independent input terminals, output terminals and enable terminals for each power module, the power modules can be controlled and monitored individually, which is convenient for troubleshooting and maintenance, and also increases the flexibility of system design.

[0025] The enabling module is an enabling circuit, specifically including a VCC power supply, a resistor R1, a resistor R2, a capacitor C and a MOS tube Q; The output end of the MCU controller outputs a control signal CTRL to form a control end, and the control end is connected to a MOS tube Q through resistors R1 and R2, and the MOS tube Q is connected to an enable end Enable of a power module.

[0026] Specifically, the power modules and the enabling circuits are both provided in N numbers, the enabling circuits are provided corresponding to the power modules, the power modules are sequentially provided as power module A, power module B...power module N, and the enabling circuits corresponding to the power modules are sequentially provided as power module A enabling module, power module B enabling module...power module N enabling module. The descriptions of other control signals and components are similar.

[0027] Furthermore, the power module A enabling circuit includes a VCC power supply, resistors RA1 and RA2, a capacitor CA, and a MOS tube QA. The control end CTRLA is connected to the MOS tube QA through the resistors RA1 and RA2, and the MOS tube QA is connected to the power module A enabling end EnableA; the power module B enabling circuit includes a VCC power supply, resistors RB1 and RB2, a capacitor CB, a MOS tube QB, a control end CTRLB is connected to the MOS tube QB through the resistors RB1 and RB2, and the MOS tube QB is connected to the power module B enabling end EnableB; the power module N enabling circuit includes a VCC power supply, resistors RN1 and RN2, a capacitor CN, a MOS tube QN, a control end CTRLN is connected to the MOS tube QN through the resistors RN1 and RN2, and the MOS tube QN is connected to the power module N enabling end EnableN.

[0028] In the initial state, the power bus input positive (Vin) and input ground (GNDi) are combined power supply, power module A, power module B and Nth power module N are connected in parallel, and are all positive logic enable modules. When the EnableA pin, EnableB pin and EnableN pin are connected to a high level (+5VTTL) or in a floating state, the power module works normally. When the EnableA pin, EnableB pin and EnableN pin are connected to a low level, the power module does not work. The CTRLA, CTRLB and CTRLN signals output by the MCU controller in the initial state are high level, and the VCC power supply is a pull-up level.

[0029] Furthermore, the power supply timing for the MCU controller should precede the power-on and power-off control signals.

[0030] Furthermore, the voltage value of the VCC power supply after being divided by resistors RA1 and RA2 is greater than the turn-on voltage of the MOS tube QA, the voltage value of the VCC power supply after being divided by resistors RB1 and RB2 is greater than the turn-on voltage of the MOS tube QB, and the voltage value of the VCC power supply after being divided by resistors RN1 and RN2 is greater than the turn-on voltage of the MOS tube QN.

[0031] The CTRLA, CTRLB and CTRLN signals output by the MCU controller in the initial state are high level.

[0032] When the CTRLA, CTRLB and CTRLN signals are at high levels, the MOS tubes QA, QB and QN are turned on, the EnableA pin, the EnableB pin and the EnableN pin are connected to a low level, the power module A, the power module B and the Nth module N do not work, and the combined power supply has no output.

[0033] Furthermore, when the MCU controller collects the power-on signal, the CTRLA, CTRLB and CTRLN signals output by the MCU controller are low level, the MOS tubes QA, QB and QN are not conducting, the EnableA pin, the EnableB pin and the EnableN pin are in a floating state, the power module A, the power module B and the Nth module N work, that is, the combined power supply is in a working state.

[0034] The CTRLA, CTRLB and CTRLN signals output by the MCU controller are signals of precise delay of the MCU internal timer 1, which are used to control the power module A, power module B and the Nth power module N to power on in sequence.

[0035] Furthermore, when the MCU controller collects a power-off signal or a protection signal, the CTRLA, CTRLB and CTRLN signals output by the MCU controller are high level, the MOS tubes QA, QB and QN are turned on, the EnableA pin, the EnableB pin and the EnableN pin are connected to a low level, the power module A, the power module B and the Nth module N do not work, that is, the combined power supply is in a non-working state.

[0036] The CTRLA, CTRLB and CTRLN signals output by the MCU controller are signals of precise delay of the MCU internal timer 2 to control the power module A, power module B and the Nth power module N to power off in sequence.

[0037] Furthermore, the timing of the internal timer 1 and timer 2 of the MCU is set by software, and the specific setting method is determined by the MCU model (MCU is a conventional component in this field, and will not be described in detail here. Just select a model that meets the functions).

[0038] Therefore, the present invention can accurately realize the power-on and power-off timing control of the power module, thereby solving the problems of complex principles of traditional analog circuits, multiple components used, and inconvenient debugging.

[0039] Specifically, the power-on and power-off delay circuit includes an MCU controller, power module A, power module B and the Nth power module N, circuit module A enabling circuit, circuit module B enabling circuit and circuit module N enabling circuit. When the MCU controller collects a power-on signal, the multiple power modules are powered on in sequence according to the program-set timing. When the MCU controller collects a power-off signal or a protection signal, the multiple power modules are powered off in sequence according to the program-set timing, so as to realize the delayed start of the multiple power modules and ensure that the power supply bus will not generate a large current at the moment of startup.

[0040] Attached Figure 1 This is a power-on timing diagram of a combined power supply power-on and power-off delay circuit of the present invention. The multi-way power supply modules of the present invention are powered on in sequence as shown in FIG. Figure 1 As shown, the time interval between the start-up time of module A and the start-up time of module B is greater than Xms, and the time interval between the start-up time of module B and the start-up time of module N is greater than Yms. Similarly, the time interval between power-off of multiple power modules in sequence is the same as the time interval between power-on.

[0041] Attached Figure 2 The present invention discloses an MCU signal acquisition interface diagram of a combined power supply power-on and power-off delay circuit. The MCU acquires power-on and power-off signals, overcurrent protection signals, overvoltage protection signals, and overtemperature protection signals, and outputs corresponding control signals CTRLA, CTRLB, and CTRLN according to the acquired signal values.

[0042] Attached Figure 3 The MCU program execution flow chart of the combined power-on and power-off delay circuit of the present invention is as follows: the CTRLA, CTRLB and CTRLN signals output by the MCU controller in the initial state are high level, and then the MCU collects the attached Figure 2 As shown in the input signal, when the MCU determines that the power-on and power-off signals are power-on signals, it enters the MCU timer 1 interrupt service program, sets the timing time in the interrupt service program, and the MCU controls the CTRLA, CTRLB and CTRLN signals according to the attached Figure 1 The timing sequence shown outputs low level in sequence, thereby controlling the power modules to power on in sequence. When the MCU determines that the power-on and power-off signals are power-off signals, and the MCU collects overcurrent protection signals, overvoltage protection signals, and overtemperature protection signals, at this time, the MCU timer 2 interrupt service program is entered, and the timing time is set in the interrupt service program. The MCU controls the CTRLA, CTRLB and CTRLN signals according to the attached Figure 1 The timing shown outputs high level in sequence, thereby controlling the power modules to power off in sequence.

[0043] Attached Figure 4 This is a combined power supply power-on and power-off delay circuit diagram of the present invention, such as Figure 4 As shown, it includes power bus Vin and GNDi, power module A, power module B and N-th power module N, power module A enabling circuit, power module B enabling circuit and power module N enabling circuit.

[0044] Power module A, power module B and the input of the Nth power module N are connected in parallel, the outputs are isolated from each other, and they are all positive logic enable modules. When the EnableA pin, EnableB pin and EnableN pin are connected to a high level (+5VTTL) or in a floating state, the power module works normally. When the EnableA pin, EnableB pin and EnableN pin are connected to a low level, the power module does not work.

[0045] The resistance values ​​of resistors R1 and R2 satisfy: VCC×R2 / (R1+R2)>Vth_Q, where Vth_Q is the turn-on voltage of MOS tube Q, that is, the voltage value of the VCC power supply after voltage division by resistors RA1 and RA2 is greater than the turn-on voltage of MOS tube QA. The VCC power supply provides a pull-up level for the CTRLA signal. When the MCU controller collects the power-on signal, the CTRLA signal output by the MCU controller is low, the MOS tube QA is not turned on, the EnableA pin is in a floating state, and the power module A works.

[0046] When the MCU controller collects a power-off signal or a protection signal, the CTRLA signal output by the MCU controller is high, the MOS tube QA is turned on, the EnableA pin is connected to a low level, and the power module A does not work.

[0047] The voltage value of the VCC power supply after being divided by resistors RB1 and RB2 must be greater than the turn-on voltage of the MOS tube QB. The VCC power supply provides a pull-up level for the CTRLB signal. When the MCU controller collects the power-on signal, the CTRLB signal output by the MCU controller is low, the MOS tube QB is not turned on, the EnableB pin is in a floating state, and the power module B works, that is, the working time of module B is Xms away from the working time of module A.

[0048] When the MCU controller collects a power-off signal or a protection signal, the CTRLB signal output by the MCU controller is high, the MOS tube QB is turned on, the EnableB pin is connected to a low level, and the power module B does not work, that is, the power-off time of module B is Xms compared to the power-off time of module A.

[0049] The voltage value of the VCC power supply after being divided by resistors RN1 and RN2 must be greater than the turn-on voltage of the MOS tube QN. The VCC power supply provides a pull-up level for the CTRLN signal. When the MCU controller collects the power-on signal, the CTRLN signal output by the MCU controller is low level, the MOS tube QN is not turned on, the EnableN pin is in a floating state, and the power module N works, that is, the working time of module N and the working time interval of module B are Yms.

[0050] When the MCU controller collects a power-off signal or a protection signal, the CTRLN signal output by the MCU controller is high, the MOS tube QN is turned on, the EnableN pin is connected to a low level, and the power module N does not work, that is, the power-off time of module N and the power-off time interval of module B are Yms.

Claims

1. A power-on and power-off delay circuit for a combined power supply, characterized in that: include: MCU controller, used to collect status signals and control circuits; Multiple power modules for power control; Each power module is provided with a corresponding enabling module, and the enabling module is used to control the action of the power module; The MCU controller is provided with a timer for setting the time interval of powering on and / or powering off the power module; The MCU controller includes an input end and an output end. The input end collects power-on, power-off and protection signals, and the output end outputs a TTL control signal. Each of the power modules is set to a parallel input and isolated output connection mode.

2. A power-on and power-off delay circuit for a combined power supply according to claim 1, characterized in that: The protection signal includes an over-current protection signal, an over-voltage protection signal and an over-temperature protection signal.

3. A power-on and power-off delay circuit for a combined power supply according to claim 1, characterized in that: Each power module is provided with an input terminal, an output terminal and an enable terminal.

4. A power-on and power-off delay circuit for a combined power supply according to claim 3, characterized in that: The enabling module is an enabling circuit, including a VCC power supply, a resistor R1, a resistor R2, a capacitor C and a MOS tube Q; The output end of the MCU controller outputs a control signal CTRL to form a control end, and the control end is connected to a MOS tube Q through resistors R1 and R2, and the MOS tube Q is connected to an enable end Enable of a power module.

5. A power-on and power-off delay circuit for a combined power supply according to claim 4, characterized in that: The power supply modules and the enabling circuits are both provided in N numbers, and the enabling circuits are provided corresponding to the power supply modules.

6. A power-on and power-off delay circuit for a combined power supply according to claim 4, characterized in that: The resistance values ​​of the resistor R1 and the resistor R2 satisfy: VCC×R2 / (R1+R2)>Vth_Q, where Vth_Q is the turn-on voltage of the MOS tube Q.

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