A control for a multiple output dc circuit and system

Abstract

The application relates to a control multi-channel direct-current output circuit and system, the control of load output is realized through the level signals of AUX1-1 and AUX1-2 of a control unit, each group of load output control is independent of each other, the length of output time can be controlled according to signals, a voltage detection module is arranged to detect the voltage of the output load, when an abnormal signal is detected, a control closing module drives a control opening module to be disconnected, so that the output control module is closed and stopped to output to the load, a current is detected by cooperating with an overcurrent protection module, overcurrent is avoided, the circuit of each device can realize independent control and overcurrent protection, and the influence of the whole system caused by problems of individual devices is avoided. Meanwhile, the common mode inductance can also reduce the mutual interference of front and rear pieces, current mutation or too large capacitance or always having a load can be avoided to cause normal starting, and unified management of power supply of the output circuit is facilitated.

Description

Technical Field

[0001] This application relates to the field of DC output circuits, and more particularly to a control circuit and system for multiple DC outputs. Background Technology

[0002] With the increasing integration of electronic devices, multi-channel power supply systems have become a core requirement in industrial control, communication equipment, data centers, and other fields. Such systems need to provide independent power to different functional modules, while requiring each branch to have overcurrent protection and independent on / off control capabilities to prevent a single-channel failure from paralyzing the entire system. Traditional multi-channel power supply solutions have the following significant drawbacks: they employ centralized protection mechanisms, mostly using global overcurrent detection or fuse protection. Once a branch is overloaded or short-circuited, it will trigger a system-wide power outage, affecting system stability. Overcurrent protection relies on fuses, which have a large response delay and require manual replacement; electronic protection often fails to quickly cut off faults due to insufficient sensitivity of the detection circuit. Utility Model Content

[0003] The technical problem this application aims to solve is that existing multi-power supply schemes employ centralized protection mechanisms, mostly using global overcurrent detection or fuse protection. Once a branch is overloaded or short-circuited, it triggers a power outage for the entire system, affecting system stability. Overcurrent protection relies on fuses, which have a large response delay and require manual replacement; electronic protection often fails to quickly cut off faults due to insufficient sensitivity of the detection circuit. To address these shortcomings of existing technologies, this application provides a circuit and system for controlling multiple DC outputs.

[0004] To solve the above-mentioned technical problems, the technical solution adopted in this application is:

[0005] A control circuit for multiple DC outputs is constructed, including a power supply unit and at least one set of working units connected to the power supply unit. Each set of working units is connected to a load. Each working unit is connected to a control unit and is independent of each other. Each working unit is also connected to a common-mode unit. Each working unit includes an output control module connected to the load. A voltage detection module is connected between the output control module and the load. The voltage detection module detects the load electrical signal and transmits the electrical signal to the control module. The working unit also includes a control enable module and a control disable module connected to the control unit. When the control enable module is open, the output control module is open and provides an electrical signal to the load. When the control disable module is open, the control enable module is closed, causing the output control module to close and disconnect the electrical signal provided to the load.

[0006] Preferably, the working unit further includes an overcurrent detection module connected to the power supply unit. The overcurrent detection module is connected to the output control module and the control shutdown module. When the overcurrent detection module detects an overcurrent, it drives the control shutdown module to open, thereby closing the control opening module and the output control module.

[0007] Preferably, the overcurrent detection module and the control enable module are connected through a voltage regulator module, and the output control module is connected to the control enable module through a filter module.

[0008] Preferably, the output control module includes a first field-effect transistor and a fourth resistor connected to the gate and drain of the first field-effect transistor. The source of the first field-effect transistor is electrically connected to the positive terminal of the load output. The voltage detection module includes a twelfth resistor connected to the source of the first field-effect transistor and a thirteenth resistor connected in series with the twelfth resistor. The control unit is connected to the connection terminal of the twelfth and thirteenth resistors.

[0009] Preferably, the control shutdown module includes a ninth resistor connected to the control unit and a fourth transistor connected to the ninth resistor. An eleventh resistor is connected between the base and emitter of the fourth transistor, and the emitter of the fourth transistor is connected to the negative terminal of the output load.

[0010] Preferably, the control activation module includes an eighth resistor connected to the control unit and a third transistor connected to the eighth resistor. A tenth resistor is connected between the base and emitter of the third transistor. The emitter of the third transistor is connected to the negative terminal of the output load. The collector of the third transistor is connected to the output control module through a seventh resistor.

[0011] Preferably, the filtering module includes a fifth resistor connected to the first field-effect transistor and a fifth capacitor connected in series with the fifth resistor. The fifth capacitor is connected to the control enable module and to the negative terminal of the output load.

[0012] Preferably, the overcurrent detection module includes a first resistor and a second resistor connected to the power supply unit. The first resistor and the second resistor are connected in parallel. The first resistor is also connected to a second transistor. A third resistor is connected between the base of the second transistor and the first resistor. A second capacitor is connected between the base and the emitter of the second transistor. The collector of the second transistor is connected to a voltage regulator module. The voltage regulator module includes a first diode. The anode of the first diode is connected to the overcurrent detection module, and the cathode is connected to the control enable module.

[0013] Preferably, the common-mode unit is configured as a group and placed between the working unit and the power supply unit, with each group of working units connected to the common-mode unit;

[0014] Alternatively, the number of common-mode units may correspond to the number of working units, with each group of working units corresponding to a group of common-mode units. The common-mode units may be placed between the power supply unit and the working unit or between the working unit and the load.

[0015] The power supply unit can be set as a group or set in accordance with the number of working units. The power supply unit includes external power supply or battery power supply.

[0016] A system is constructed that includes multiple devices, which are controlled by a control multi-channel DC output circuit as described above, enabling each group of devices to perform independent switching control and overcurrent protection.

[0017] The beneficial effects of this application are as follows: Load output control is achieved through the level signals of AUX1-1 and AUX1-2 of the control unit, and each load output control is independent of the others. The output duration can be controlled according to the signal. Simultaneously, a voltage detection module detects the voltage of the output load. When an abnormal signal is detected, the control shutdown module drives the control startup module to disconnect, causing the output control module to shut down and stop outputting to the load. In conjunction with an overcurrent protection module, current is detected to prevent overcurrent. Each device's circuit can achieve independent control and overcurrent protection, preventing individual device malfunctions from affecting the entire system. Furthermore, the common-mode inductor reduces mutual interference between upstream and downstream components, preventing current surges, excessive capacitance, or continuous load from causing startup failures, and facilitating unified management of the output circuit's power supply. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the present application will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The schematic diagram of the output circuit with the common-mode inductor (only one set) in front is a preferred embodiment of this application.

[0020] Figure 2 This is a block diagram of the output circuit of a preferred embodiment of the present application, with the common-mode inductors (multiple sets) at the front.

[0021] Figure 3 The following is a schematic block diagram of the common-mode inductors (multiple sets) of the output circuit in a preferred embodiment of this application;

[0022] Figure 4 This is a schematic block diagram of the working unit of a preferred embodiment of this application;

[0023] Figure 5The following is a detailed circuit diagram of the output circuit of a preferred embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this application. Obviously, the described embodiments are some embodiments of this application, but not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0025] A preferred embodiment of this application provides a control circuit for multiple DC output channels; such as... Figures 1-3 As shown, the system includes a power supply unit 10, which can be powered by a power source or a battery; a common-mode unit 20 connected to the power supply; and multiple working units 50 connected to the common-mode unit. These working units are connected in parallel and are all connected to the common-mode unit. Each working unit is connected to its own load 40. The system also includes a control unit 30 connected to the multiple working units 50. The control unit sends a level signal to each working unit and detects the electrical signal between the working unit and the load, enabling each working unit to be independently controlled to turn on or off, and allowing the current of each working unit to be detected individually. Figure 1 As shown, the common-mode unit 20 can be configured as a group and placed between the working unit 50 and the power supply unit 10. In this case, the common-mode unit is electrically connected to the first working unit 50-1, the second working unit 50-2, and the Nth working unit 50-N, and each group of working units is connected to its respective load 40. For example... Figure 2 As shown, the common-mode unit 20 can also be configured as multiple groups and placed between the power supply unit 10 and the working unit 50. The number of groups corresponds to the number of working units. That is, the first common-mode unit 20-1 is connected to the first working unit 50-1 and then to the first load 40-1; the second common-mode unit 20-2 is connected to the second working unit 50-2 and then to the second load 40-2; the Nth common-mode unit 20-N is connected to the Nth working unit 50-N and then to the Nth load 40-N. Each group of working units is connected to the control unit 30. This configuration is suitable for use when the load supply current is relatively small. Figure 3 As shown, the common mode unit 20 can be configured into multiple groups and placed between the working unit 50 and the load 40 for corresponding settings. This is suitable for use when the load supply current is relatively large. The common mode unit can be composed of a common mode inductor.

[0026] Specifically, such as Figure 4As shown, each working unit 50 has the same structure, including an overcurrent detection module 500 connected to the common-mode unit 20, and an output control module 501 connected to the overcurrent detection module. The output control module is connected to the load 40. A voltage detection module 506 is also provided between the output control module and the load to detect the voltage on the connection line between the output control module and the load. The voltage detection module 506 transmits the detected signal to the control unit 30. The control unit includes two sets of output pins. The first output pin is connected to the control shutdown module 503, and the second output pin is connected to the control startup module 505. The control startup module is connected to the output control module to drive the output control module 501 to open. The output shutdown module 503 is connected to the output startup module 505 and drives the control startup module to close, thereby controlling the output control module 501 to close. The overcurrent detection module is electrically connected to the control shutdown module 503. When an overcurrent occurs, the control shutdown module drives the control startup module to shut down, which in turn shuts down the output control module. At the same time, the detection signal from the overcurrent detection module 500 also keeps the control startup module 505 open through the voltage regulator module 502. The connection line between the output control module and the load is also equipped with a filter module 504. The filter module is connected to the control startup module to keep the control startup module 505 open and drive the output control module 501 to open and output an electrical signal to the load.

[0027] Furthermore, such as Figures 4-5As shown, the overcurrent detection module 500 includes a first resistor R1 connected to the common-mode unit, and a second resistor R2 connected in parallel with the first resistor R1. A third resistor R3 is connected to the second end of the first resistor R1, and the third resistor R3 is connected to the base of the second diode Q2. Simultaneously, the first end of the first resistor R1 is connected to the emitter of the second transistor Q2. A second capacitor C2 is connected between the base and emitter of the second transistor Q2. The output control module 501 includes the drain of a first field-effect transistor Q1 connected to the second end of the first resistor R1. A fourth resistor R4 is connected between the gate and drain of the first field-effect transistor Q1. The source of the first field-effect transistor Q1 is connected to AUX1+ and then to the positive terminal of the load to supply power to the load. The voltage detection module 506 includes a twelfth resistor R12 connected to the source of the first field-effect transistor Q1. The second end of the twelfth resistor R12 is connected to a thirteenth resistor R13. The second end of the thirteenth resistor R13 is connected to the first terminal of the load and grounded. The first end of the twelfth resistor R12 is connected to the second terminal of the load. A first capacitor C1 is connected between the first end of the twelfth resistor R12 and the second end of the thirteenth resistor R13. The first end of the thirteenth resistor R11 is connected to the detection port AUX1-3 of the control module to detect the voltage signal of the load. The first output port AUX1-1 of the control module is connected to the control enable module 505. The control enable module includes an eighth resistor R8 connected to AUX1-1. The eighth resistor is connected to the base of the third transistor Q3 and to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is grounded to connect to the negative terminal of the output load and to the emitter of the third transistor Q3. The collector of the third transistor Q3 is connected to the first end of the seventh resistor R7. The second end of the seventh resistor R7 is connected to the gate of the first field-effect transistor Q1. The second output port AUX1-2 of the control module is connected to the control shutdown module 503. The control shutdown module includes a ninth resistor R9 connected to AUX1-2. The second end of the ninth resistor R9 is connected to the base of the fourth transistor Q4 and to the first end of the eleventh resistor R11. The second end of the eleventh resistor R11 is grounded and connected to the emitter of the fourth transistor Q4, so the emitter of the fourth transistor Q4 is also grounded. The collector of the fourth transistor Q4 is connected to the second end of the eighth resistor R8. The filter module 504 includes a fifth resistor R5 connected to the source of the first field-effect transistor Q1. The second end of the fifth resistor R5 is connected to the collector of the fourth transistor Q4 and to the first end of the fifth capacitor C5. The second end of the fifth capacitor C5 is connected to the emitter of the fourth transistor Q4. A first diode D1 is connected between the collector of the second transistor Q2 and the second terminal of the seventh resistor R7. The anode of the first diode D1 is connected to the second transistor. At the same time, the collector of the second transistor Q2 is also connected to the sixth resistor R6. The second terminal of the sixth resistor R6 is connected to the base of the fourth transistor Q4.

[0028] In the output circuit process of this application, when the VDD power supply is normal, and the output state is closed (i.e., no load is connected), the AUX1-1 of the control unit outputs a low level. At this time, the third transistor Q3 is in the off state, which will cause the first field-effect transistor Q1 to be in the off state. Meanwhile, the AUX1-2 of the control unit outputs a high level, and the fourth transistor Q4 is in the on state, thus closing the output state.

[0029] When the VDD power supply is normal and the output needs to be turned on, the AUX1-2 output of the control unit is first set to a high level, turning off the fourth transistor Q4. Then, a PWM signal with a set output time is output to the AUX1-1 control unit and kept low. This signal turns on the third transistor Q3 through the eighth resistor R8, and then turns on the first field-effect transistor Q1 through the seventh resistor R7. The VDD voltage is then output to other external loads on AUX1+ after the first field-effect transistor Q1 is turned on. Simultaneously, the output voltage is filtered by the fifth resistor R5 and the fifth capacitor C5, providing a voltage signal to the third field-effect transistor Q3 to keep it on continuously, and keeping the first field-effect transistor Q1 on continuously, thus ensuring the continuous output voltage of AUX1+. The AUX1-3 control unit detects that the output voltage is on. The duration of the AUX1-1 output and the frequency of the PWM signal can be set according to the component parameters and are adjustable parameters.

[0030] When the VDD power supply is normal and the AUX1+ output voltage is normal, if it is necessary to turn off the AUX1+ output voltage, the control unit AUX1-1 output can be kept at a low level and the AUX1-2 output can be kept at a high level. The fourth transistor Q4 is turned on through the ninth resistor R9. Since AUX1-1 is at a low level, the third transistor Q3 will be in the off state, and the first field-effect transistor Q1 will also be in the off state. Then the AUX1+ output voltage will be turned off, and the AUX1-3 control unit will detect that the output voltage is turned off.

[0031] When VDD power supply is normal and AUX1+ output voltage is normal, and AUX1+ is connected to an output load, if a current exceeding the set value or a short circuit occurs, the current forms a voltage drop across the first resistor R1 and the second resistor R2. This voltage drop turns on the second transistor Q2 through the third resistor R3, then turns on the fourth transistor Q4 through the sixth resistor R6, and turns off the third transistor Q3. Simultaneously, the electrical signal through the first diode D1 turns off the first MOSFET Q1, ultimately shutting down the AUX1+ output voltage. Because a common-mode inductor is used to construct the common-mode module, mutual interference between the output inductor and the common-mode module is reduced. Furthermore, the common-mode inductor has no leakage inductance, so the PWM signal output at the start of output will not cause a current surge on the common-mode inductor. This allows for the charging process of an external capacitor without the capacitor being too large or a continuous load preventing normal startup. This avoids the problem of excessive transient current caused by the capacitor during output switching when there is no common-mode inductor, which could lead to overcurrent detection and circuit malfunction, thus ensuring normal circuit operation.

[0032] A preferred embodiment of this application provides a system that includes multiple devices and a control circuit for multiple DC outputs to power and manage these devices. The system centrally manages the power supply to each device and enables independent switching control and overcurrent protection for each device through the control circuit, preventing individual device malfunctions from affecting the entire system. Specifically, the structure of the control circuit for multiple DC outputs is the same as described above and will not be repeated here.

[0033] It should be understood that this application has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this application. Furthermore, based on the teachings of this application, these features and embodiments can be modified to suit specific circumstances and materials without departing from the spirit and scope of this application. Therefore, this application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this application.

Claims

1. A control circuit for multiple DC outputs, comprising a power supply unit and at least one set of working units connected to the power supply unit, each set of working units being connected to a load, each working unit being connected to a control unit, and the working units being independent of each other, characterized in that: The working unit is also connected to a common-mode unit. The working unit includes an output control module, which is connected to the load. A voltage detection module is connected between the output control module and the load. The voltage detection module detects the load electrical signal and transmits the electrical signal to the control module. The working unit also includes a control enable module and a control disable module connected to the control unit. When the control enable module is open, the output control module is open to provide an electrical signal to the load. When the control disable module is open, the control enable module is closed to shut down the output control module and disconnect the electrical signal provided to the load.

2. The DC output circuit according to claim 1, characterized in that: The working unit also includes an overcurrent detection module connected to the power supply unit. The overcurrent detection module is connected to the output control module and the control shutdown module. When the overcurrent detection module detects an overcurrent, it drives the control shutdown module to open, thereby closing the control opening module and the output control module.

3. The DC output circuit according to claim 2, characterized in that: The overcurrent detection module and the control enable module are connected through a voltage regulator module, and the output control module is connected to the control enable module through a filter module.

4. The DC output circuit according to claim 3, characterized in that: The output control module includes a first field-effect transistor (FET) and a fourth resistor connected to the gate and drain of the first FET. The source of the first FET is electrically connected to the positive terminal of the load output. The voltage detection module includes a twelfth resistor connected to the source of the first FET and a thirteenth resistor connected in series with the twelfth resistor. The control unit is connected to the connection terminals of the twelfth and thirteenth resistors.

5. The DC output circuit according to claim 3, characterized in that: The control shutdown module includes a ninth resistor connected to the control unit and a fourth transistor connected to the ninth resistor. An eleventh resistor is connected between the base and emitter of the fourth transistor, and the emitter of the fourth transistor is connected to the negative terminal of the output load.

6. The DC output circuit according to claim 3, characterized in that: The control activation module includes an eighth resistor connected to the control unit and a third transistor connected to the eighth resistor. A tenth resistor is connected between the base and emitter of the third transistor. The emitter of the third transistor is connected to the negative terminal of the output load. The collector of the third transistor is connected to the output control module through a seventh resistor.

7. The DC output circuit according to claim 3, characterized in that: The filtering module includes a fifth resistor connected to the first field-effect transistor and a fifth capacitor connected in series with the fifth resistor. The fifth capacitor is connected to the control enable module and to the negative terminal of the output load.

8. The DC output circuit according to claim 3, characterized in that: The overcurrent detection module includes a first resistor and a second resistor connected to the power supply unit. The first resistor and the second resistor are connected in parallel. The first resistor is also connected to a second transistor. A third resistor is connected between the base of the second transistor and the first resistor. A second capacitor is connected between the base and the emitter of the second transistor. The collector of the second transistor is connected to a voltage regulator module. The voltage regulator module includes a first diode. The anode of the first diode is connected to the overcurrent detection module, and the cathode is connected to the control enable module.

9. The DC output circuit according to claim 1, characterized in that: The common mode unit is configured as a group and placed between the working unit and the power supply unit, with each group of working units connected to the common mode unit; Alternatively, the number of common-mode units may correspond to the number of working units, with each group of working units corresponding to a group of common-mode units. The common-mode units may be placed between the power supply unit and the working unit or between the working unit and the load. The power supply unit can be set as a group or set in accordance with the number of working units. The power supply unit includes external power supply or battery power supply.

10. A system comprising a plurality of devices, characterized in that: The various devices described herein are controlled by a control multi-channel DC output circuit as described in any one of claims 1-9, enabling each group of devices to perform independent switching control and overcurrent protection.

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