A multi-module synchronous starting circuit

Abstract

The present invention discloses a multi-module synchronous startup circuit, comprising: a control signal module and a plurality of controlled modules; wherein the controlled modules comprise a first MOS tube and a power module; the control signal module is connected to the gate of each first MOS tube, the source of each first MOS tube is connected to each other, the drain of each first MOS tube is connected to each other, and the drain of each first MOS tube is connected to the first port of the power module; the power module comprises a microcontroller and a second MOS tube; the control signal module is used to control the first MOS tube of each controlled module to be cut off or turned on; the microcontroller of each controlled module is used to control the start of each power module. The present invention can realize the parallel startup synchronization of multiple power modules without changing the mechanical structure definition of the power module.

Description

Technical Field

[0001] The invention relates to the application field of synchronous circuits, in particular to a multi-module synchronous starting circuit. Background Art

[0002] When multiple power modules are connected in parallel with loads, the startup time of each load module may be inconsistent, resulting in a voltage difference between the final load modules. Starting the power module early will share the current that exceeds the rated load of the module itself, further affecting the normal operation of the circuit system. Existing technologies mainly rely on adding an additional synchronization pin and related circuits to achieve synchronization, or solve this problem by broadcasting the controller area network bus (CAN communication bus).

[0003] In the prior art, the additional synchronization pins will occupy the available area of ​​the internal circuit board and will also lead to the redefinition of the external mechanical structure, which cannot meet the existing usage requirements of the client; the controller area network bus (Can communication bus) cannot be applied to power modules without controller area network bus (Can communication bus) peripherals, and cannot meet the needs of general power modules. In addition, there is a certain delay time in communication reception, and a good synchronous startup effect cannot be achieved.

[0004] Therefore, there is still no circuit that can solve the problem of synchronous startup of multiple power modules in parallel without changing the mechanical structure of the original power module. Summary of the invention

[0005] The invention provides a multi-module synchronous starting circuit, which can realize the parallel starting synchronization of multiple power modules without changing the mechanical structure definition of the power modules.

[0006] In order to solve the above technical problems, the present invention provides a multi-module synchronous starting circuit, comprising: a control signal module and a plurality of controlled modules;

[0007] Wherein, the controlled module includes a first MOS tube and a power supply module;

[0008] The control signal module is connected to the gate of each first MOS tube, the source of each first MOS tube is connected to each other, the drain of each first MOS tube is connected to each other, and the drain of each first MOS tube is connected to the first port of the power module;

[0009] The power module includes a microcontroller and a second MOS tube;

[0010] The control signal module is used to control the first MOS tube of each controlled module to be turned off or on;

[0011] The microcontroller of each controlled module is used to control the start-up of each power module.

[0012] The present invention connects the control signal module with multiple controlled modules through the above connection, and uniformly transmits the level to the controlled modules through the signal module to control the uniform cut-off and on states of the first MOS tubes in the controlled modules. When the first MOS tube is turned on, the power module is turned off. When the first MOS tube is turned on, the microcontroller of each power module controls the second MOS tube of each power module to be turned on or off. When the second MOS tube of each power module is turned off, the power module is turned on. Through the above method, the circuit does not need to be connected to other circuits or electronic modules, and realizes the parallel startup of multiple power modules on the existing control signal module of the power module.

[0013] As a preferred example, the control signal module is used to control the first MOS tube of each controlled module to be turned off or on, specifically:

[0014] When the control signal module sends a high level to each of the controlled modules, each of the first MOS tubes of each of the controlled modules is turned on;

[0015] When the control signal module sends a low level to each of the controlled modules, each of the first MOS tubes of each of the controlled modules is turned off.

[0016] In this preferred example, the signal module uniformly sends a high level to control the first MOS tube of each controlled module to be turned on, and uniformly sends a low level to control the first MOS tube of each controlled module to be turned off, so that the signal module can synchronously turn off or turn on the first MOS tube of each controlled module.

[0017] As a preferred example, the microcontroller of each of the controlled modules is used to control the start of each of the power modules, specifically:

[0018] When the second port of the microcontroller outputs a low level to the gate of the second MOS tube to control the second MOS tube to be cut off, the first port of each microcontroller is at a high level, and the power module is turned on;

[0019] When the second port of the microcontroller outputs a high level to the gate of the second MOS tube to control the second MOS tube to be turned on, the first port of each microcontroller is at a low level and the power module is turned off.

[0020] In this preferred example, the MOS tube that is cut off due to receiving a high level from the control module, when the second port of the microcontroller outputs a low level to the gate of the second MOS tube so that the second MOS tube is cut off, and the first port of the microcontroller is at a high level, then the power module is turned on; the MOS tube that is turned on due to receiving a low level from the control module, when the second port of the microcontroller outputs a high level to the gate of the second MOS tube so that the second MOS tube is turned on, and the first port of the microcontroller is at a low level, then the power module is turned off.

[0021] As a preferred example, the first port of the power module is connected to the first port of the microcontroller, and the first port of the power module is also connected to the drain of the second MOS tube;

[0022] The first port of the microcontroller is connected to the drain of the second MOS transistor, and the second port of the microcontroller is connected to the gate of the second MOS transistor.

[0023] In this preferred example, the first port of the microcontroller is connected to the drain of the second MOS tube so that the first port of the microcontroller and the drain of the second MOS tube are consistent in level when the second MOS tube is turned on or off, and the second port of the microcontroller is connected to the gate of the second MOS tube so that the microcontroller output level controls the cutoff or conduction of the second MOS tube.

[0024] As a preferred example, the power module further includes a pull-up resistor;

[0025] The first port of the pull-up resistor is connected to the first port of the power module, and the second port of the pull-up resistor is connected to the power supply voltage.

[0026] In this preferred example, each power module is connected to a pull-up resistor to ensure that the first port of the microcontroller maintains a high level when the MOS tube is turned off, thereby ensuring that the potential is stable.

[0027] As a preferred example, the first MOS tubes are all NMOS tubes.

[0028] This preferred example further controls the level signal received by the controlled module through the conduction and cutoff of the N-MOS transistor, and further determines the level of the microcontroller output, which has the advantages of low cost and high conversion efficiency.

[0029] As a preferred example, the second MOS tubes are all NMOS tubes.

[0030] This preferred example further controls the on and off of the power module by turning on and off the N-MOS transistor, and has the advantages of low cost and high conversion efficiency.

[0031] The present invention provides a multi-module synchronous startup circuit, so that the control signal module is connected to multiple controlled modules, and the level is uniformly transmitted to the controlled modules through the signal module to control the uniform cut-off and on states of the first MOS tubes in the controlled modules. When the first MOS tube is turned on, the power module is turned off. When the first MOS tube is turned on, the microcontroller of each power module controls the second MOS tube of each power module to be turned on or off. When the second MOS tube of each power module is turned off, the power module is turned on. Through the above method, the circuit realizes the parallel startup of multiple power modules on the existing control signal module of the power module without the need for external connection of other circuits or electronic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a circuit module diagram of a multi-module synchronous starting circuit of a certain embodiment provided by the present invention;

[0033] Figure 2 It is a circuit diagram of a multi-module synchronous starting circuit of a certain embodiment provided by the present invention;

[0034] Figure 3 The present invention provides a signal change diagram of a multi-module synchronous starting circuit according to a certain embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings 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.

[0036] A multi-module synchronous starting circuit provided by an embodiment of the present invention is suitable for realizing the synchronous starting of multiple power modules in parallel without changing the mechanical structure definition of the power modules.

[0037] See also Figure 1 In one embodiment of the present invention, there is provided Figure 1 The circuit module diagram of a multi-module synchronous starting circuit shown includes: a control signal module and a plurality of controlled modules;

[0038] Wherein, the controlled module includes a first MOS tube and a power supply module;

[0039] The control signal module is connected to the gate of each first MOS tube, the source of each first MOS tube is connected to each other, the drain of each first MOS tube is connected to each other, and the drain of each first MOS tube is connected to the first port of the power module;

[0040] The power module includes a microcontroller and a second MOS tube;

[0041] The control signal module is used to control the first MOS tube of each controlled module to be turned off or on;

[0042] The microcontroller of each controlled module is used to control the start-up of each power module.

[0043] The present invention connects the control signal module with multiple controlled modules through the above connection, uniformly transmits the level to the controlled modules through the signal module, controls the uniform cut-off and conduction states of the first MOS tubes in the controlled modules, and further controls the power modules in the controlled modules to be uniformly turned on or off through the uniform cut-off and conduction of the first MOS tubes in each controlled module. Through the above method, the circuit realizes the parallel startup of multiple power modules on the existing control signal module of the power module without the need for external connection of other circuits or electronic modules.

[0044] The control signal module mentioned above is used to control the first MOS tube of each controlled module to be turned off or on, specifically:

[0045] When the control signal module sends a high level to each of the controlled modules, each of the first MOS tubes of each of the controlled modules is turned on;

[0046] When the control signal module sends a low level to each of the controlled modules, each of the first MOS tubes of each of the controlled modules is turned off.

[0047] After the signal module controls the first MOS tube, the microcontroller of each controlled module is used to control the start of each power module, specifically:

[0048] When the second port of the microcontroller outputs a low level to the gate of the second MOS tube to control the second MOS tube to be cut off, the first port of each microcontroller is at a high level, and the power module is turned on;

[0049] When the second port of the microcontroller outputs a high level to the gate of the second MOS tube to control the second MOS tube to be turned on, the first port of each microcontroller is at a low level and the power module is turned off.

[0050] Preferably, the first port of the power module is connected to the first port of the microcontroller, and the first port of the power module is also connected to the drain of the second MOS tube;

[0051] The first port of the microcontroller is connected to the drain of the second MOS transistor, and the second port of the microcontroller is connected to the gate of the second MOS transistor.

[0052] Preferably, the power module further includes a pull-up resistor;

[0053] The first port of the pull-up resistor is connected to the first port of the power module, and the second port of the pull-up resistor is connected to the power supply voltage.

[0054] Preferably, the first MOS transistors are all NMOS transistors.

[0055] Preferably, the second MOS transistors are all NMOS transistors.

[0056] As an example of this embodiment, please refer to Figure 1 , this embodiment provides Figure 1 The circuit module diagram of a multi-module synchronous startup circuit shown includes a control signal module and n controlled modules, wherein the n controlled modules correspondingly include n first MOS tubes and n power modules, and each controlled module includes a first MOS tube and a power module. Further, the n power modules correspondingly include n microcontrollers and n second MOS tubes, and each power module includes a microcontroller and a second MOS tube.

[0057] After power-on, when the control module sends a high-level signal to each controlled module, since each first MOS tube adopts an NMOS tube, the gate potential of each first MOS tube is higher than the source potential, and each first MOS tube is turned on. At this time, the drain of each first MOS tube is at a low level. Since the control signal module is connected to the gate of each first MOS tube, the source and drain of each first MOS tube are respectively connected to each other, and the drain of each first MOS tube is connected to the first port of the power module, so that the first port of the power module is at a low level, and the power module is shut down at this time.

[0058] Another possibility is that after power-on, when the control module sends a low-level signal to each controlled module, since each first MOS tube adopts an NMOS tube, the gate potential of each first MOS tube is lower than the source potential, and each first MOS tube is cut off. When the second port of the microcontroller of each power module outputs a high level, since each second MOS tube adopts an NMOS tube, the gate potential of each second MOS tube is higher than the source potential, and each second MOS tube is turned on. At this time, the drain of each second MOS tube is a low level. Since the first port of each microcontroller is connected to the drain of each second MOS tube, the first port of the power module is a low level, and the power module is shut down.

[0059] Another possibility is that after power-on, when the control module sends a low-level signal to each controlled module, since each first MOS tube adopts an NMOS tube, the gate potential of each MOS tube is lower than the source potential, and each first MOS tube is cut off. When the second port of the microcontroller of each power module outputs a low level, since each second MOS tube adopts an NMOS tube, the gate potential of each second MOS tube is lower than the source potential, and each second MOS tube is cut off. At this time, since the drain of each second MOS tube is connected to the pull-up resistor, the drain of each second MOS tube is at a high level. Since the first port of each microcontroller is connected to the drain of each second MOS tube, the first port of the power module is at a high level, and the power module is turned on.

[0060] As an example of this embodiment, please refer to Figure 2 , this embodiment provides Figure 2 The circuit diagram of a multi-module synchronous starting circuit is shown. In this embodiment, two controlled modules are used. In other possible embodiments, two or more controlled modules may be used.

[0061] In this embodiment, it includes: power module 1, power module 2, first MOS tube Q2, first MOS tube Q4, and control signal ONOFF of the control module. The control signal ONOFF is an external enable signal of the power module, which controls the power on and off of the power module. A low level is connected to start the power module, and a high level is connected to shut down the power module. The power module 1 and MOS tube Q2 constitute the controlled module 1, and the power module 2 and MOS tube Q4 constitute the controlled module 2.

[0062] The power module 1 includes: MCU1, Pin1 of the first port of MCU1 is a synchronous output control signal SYNC_CTR1, a second MOS tube Q1, a pull-up resistor R1, and an input signal Pin2 of the second port of MCU1 (ie, ONOFF1 network).

[0063] The power module 2 includes: MCU2, Pin1_2 of the first port of MCU2 is a synchronous output control signal SYNC_CTR2, a second MOS tube Q3, a pull-up resistor R2, and a second port of MCU2 input signal Pin2_2 (ie, ONOFF2 network).

[0064] See also Figure 3 A signal change diagram of a multi-module synchronous startup circuit. After the system is powered on, the ONOFF signal is high from T0 to T1. At this time, the first MOS tube Q2 and the MOS tube Q4 are turned on at the same time, and the ONOFF1 signal of the power module 1 and the ONOFF2 signal of the power module 2 become low levels, that is, the input signal Pin2 of the second port of MCU1 is low level, and the input signal Pin2_2 of the second port of MCU2 is low level. At this time, the module is in the shutdown state.

[0065] From T1 to T2, the synchronous output control signal SYNC_CTR1 of the first port of MCU1 of the power module 1 is at a high level, the second MOS tube Q1 is turned on, ONOFF1 and ONOFF2 are at a low level, and the module still does not start up.

[0066] From T2 to T3, the synchronous output control signal SYNC_CTR2 of the first port of MCU2 of the power module 2 is at a high level, the second MOS tube Q3 is turned on, ONOFF1 and ONOFF2 are at a low level, and the module still does not start up.

[0067] After time T3, ONOFF is at a low level, the synchronous output control signal SYNC_CTR1 of the first port of MCU1 of the power module 1 is at a low level, and the synchronous output control signal SYNC_CTR2 of the first port of MCU2 of the power module 2 is at a low level. At this time, the second MOS tube Q1, the first MOS tube Q2, the second MOS tube Q3, and the first MOS tube Q4 are all off, and the input signal Pin2 of the second port of MCU1 in the power module 1 and the input signal Pin2_2 of the second port of MCU2 in the power module 2 are at a high level. At this time, the module output voltage will be started synchronously.

[0068] The present invention connects the control signal module with multiple controlled modules through the above connection, and uniformly transmits the level to the controlled modules through the signal module to control the uniform cut-off and on states of the first MOS tubes in the controlled modules. When the first MOS tube is turned on, the power module is turned off. When the first MOS tube is turned on, the microcontroller of each power module controls the second MOS tube of each power module to be turned on or off. When the second MOS tube of each power module is turned off, the power module is turned on. Through the above method, the circuit does not need to be connected to other circuits or electronic modules, and realizes the parallel startup of multiple power modules on the existing control signal module of the power module.

[0069] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-module synchronous starting circuit, characterized in that: include: Control signal module and multiple controlled modules; Wherein, the controlled module includes a first MOS tube and a power supply module; The control signal module is connected to the gate of each first MOS tube, the source of each first MOS tube is connected to each other, the drain of each first MOS tube is connected to each other, and the drain of each first MOS tube is connected to the first port of the power module; The power module includes a microcontroller and a second MOS tube; The power module further comprises a pull-up resistor, a first port of the pull-up resistor is connected to the first port of the power module, and a second port of the pull-up resistor is connected to a power supply voltage; The control signal module is used to control the first MOS tube of each controlled module to be turned off or on; The microcontroller of each controlled module is used to control the opening of each power module, wherein, when the second port of the microcontroller outputs a low level to the gate of the second MOS tube to control the second MOS tube to be cut off, the first port of each microcontroller is a high level and the power module is turned on; when the second port of the microcontroller outputs a high level to the gate of the second MOS tube to control the second MOS tube to be turned on, the first port of each microcontroller is a low level and the power module is turned off.

2. A multi-module synchronous starting circuit according to claim 1, characterized in that: The control signal module is used to control the first MOS tube of each controlled module to be turned off or on, specifically: When the control signal module sends a high level to each of the controlled modules, each of the first MOS tubes of each of the controlled modules is turned on; When the control signal module sends a low level to each of the controlled modules, each of the first MOS tubes of each of the controlled modules is turned off.

3. A multi-module synchronous starting circuit according to claim 1, characterized in that: The first port of the power module is connected to the first port of the microcontroller, and the first port of the power module is also connected to the drain of the second MOS tube; The first port of the microcontroller is connected to the drain of the second MOS transistor, and the second port of the microcontroller is connected to the gate of the second MOS transistor.

4. A multi-module synchronous starting circuit according to claim 1, characterized in that: The first MOS tubes are all NMOS tubes.

5. A multi-module synchronous starting circuit according to claim 1, characterized in that: The second MOS tubes are all NMOS tubes.

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