Circuit for simultaneously controlling on-off of positive and negative power supplies

Abstract

The utility model discloses a kind of circuit for simultaneously controlling positive and negative power supply on-off, belong to computer power supply and server power supply technical field, including power on-off control module, positive power module and negative power module;Power on-off control module is electrically connected with the starting control signal of outside, power on-off control module is electrically connected with positive power module and negative power module, and the positive voltage power supply input end of positive power module is electrically connected with the external load electric appliance;Negative power module is electrically connected with the negative voltage power supply input end of external load electric appliance.Through power on-off control module receives starting control signal, simultaneously utilize the collaborative design to positive power module and negative power module, utilize MOS tube to realize the synchronous switch control to positive and negative power supply, there is no mechanical contact of electromagnetic relay, just avoid the problem of mechanical contact contact bad, simultaneously, the working current of MOS tube is greater, conduction loss is lower, can effectively reduce power consumption.

Description

Technical Field

[0001] This utility model belongs to the field of computer power supply and server power supply technology, specifically relating to a circuit that simultaneously controls the on / off switching of positive and negative power supplies. Background Technology

[0002] In numerous electronic devices and power control systems, the power supply unit is a core component, and its performance and reliability directly affect the overall system operation. Currently, there is a type of single power supply unit on the market that has the capability to provide four sets of controllable positive and negative voltage output power, and it has certain applications in industrial automation control, scientific research equipment, and some electronic systems with specific power output requirements.

[0003] However, this traditional power supply device, which uses electromagnetic relays to control the switching on and off of each power supply group, has revealed many problems in actual use. First, electromagnetic relays are prone to poor contact. Over long-term use, their contacts can experience increased contact resistance due to wear, oxidation, and other factors, potentially leading to poor contact. Once poor contact occurs, it not only affects the normal power output, causing abnormal equipment operation, but may also trigger circuit failures, damage other electronic components, and pose a serious threat to the stable operation of the equipment.

[0004] Furthermore, electromagnetic relays consume a relatively high amount of power. During the frequent switching of power on and off, electromagnetic relays require a certain amount of electrical energy to maintain their operating state, which obviously increases the operating cost of the equipment.

[0005] Therefore, there is an urgent need to provide a circuit that can effectively reduce power consumption while controlling the switching on and off of positive and negative power supplies, avoiding the problem of poor contact at the contacts. Utility Model Content

[0006] The purpose of this invention is to provide a circuit that simultaneously controls the on / off state of positive and negative power supplies, thereby solving the aforementioned problems existing in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a circuit that simultaneously controls the on / off state of positive and negative power supplies, including: a power supply on / off control module, a positive power supply module, and a negative power supply module;

[0009] The input terminal of the power on / off control module is electrically connected to an external start control signal, the control signal output terminal of the power on / off control module is electrically connected to the input terminal of the positive power module, and the power supply output terminal of the positive power module is electrically connected to the positive voltage power supply input terminal of the external load appliance.

[0010] The control signal output terminal of the power on / off control module is also electrically connected to the input terminal of the negative power supply module, and the power supply output terminal of the negative power supply module is electrically connected to the negative voltage power supply input terminal of the external load appliance.

[0011] In one possible design, the power on / off control module includes a first diode, a start signal receiving unit, and an auxiliary power supply unit;

[0012] The input terminal of the start signal receiving unit serves as the input terminal of the power supply on / off control module and is electrically connected to an external start control signal. The output terminal of the start signal receiving unit is electrically connected to the auxiliary bus of the auxiliary power supply unit. One end of the first diode is grounded, and the other end of the first diode is electrically connected to the start signal receiving unit. The common terminal of the first diode and the start signal receiving unit serves as the control signal output terminal of the power supply on / off control module and is electrically connected to the input terminal of the positive power supply module and the input terminal of the negative power supply module, respectively.

[0013] In one possible design, the start signal receiving unit includes a current-limiting resistor, a current-regulating resistor, a first transistor, and a second transistor.

[0014] In this configuration, one end of the current-limiting resistor serves as the input terminal of the start signal receiving unit, electrically connected to an external start control signal. The other end of the current-limiting resistor is electrically connected to the base of the first transistor, the emitter of the first transistor is grounded, the collector of the first transistor is electrically connected to one end of the current-stabilizing resistor, the other end of the current-stabilizing resistor is electrically connected to the base of the second transistor, the emitter of the second transistor serves as the output terminal of the start signal receiving unit, electrically connected to the auxiliary bus of the auxiliary power supply, the collector of the second transistor is electrically connected to the first diode, and the collector of the second transistor serves as the control signal output terminal of the power on / off control module, electrically connected to the input terminals of the positive power supply module and the negative power supply module, respectively.

[0015] In one possible design, the first transistor is an NPN transistor, the second transistor is a PNP transistor, and the auxiliary power supply unit uses a 24V auxiliary power supply.

[0016] In one possible design, the positive power supply module includes a delayed on-resistor, a first MOSFET, a third diode, and a positive power supply unit;

[0017] The positive power supply unit includes a positive power supply bus and a positive power supply output. One end of the delay-on resistor serves as the input terminal of the positive power supply module and is electrically connected to the control signal output terminal of the power supply on / off control module. The other end of the delay-on resistor is electrically connected to the gate of the first MOS transistor. The source of the first MOS transistor is electrically connected to the positive power supply output of the positive power supply unit, and the drain of the first MOS transistor is electrically connected to the positive power supply bus of the positive power supply unit.

[0018] The third diode is connected in parallel between the gate and the source of the first MOS transistor. The positive power output of the positive power supply unit serves as the power supply output terminal of the positive power supply module and is electrically connected to the positive voltage power supply input terminal of the external load device.

[0019] In one possible design, the negative power supply module includes a first voltage divider resistor, a second voltage divider resistor, a second diode, a second MOSFET, and a negative power supply unit;

[0020] The negative power supply unit includes a negative power supply bus and a negative power supply output. One end of the first voltage divider resistor serves as the input terminal of the negative power supply module and is electrically connected to the control signal output terminal of the power supply on / off control module. The other end of the first voltage divider resistor is electrically connected to the gate of the second MOS transistor through the second diode. The source of the second MOS transistor is electrically connected to the negative power supply bus of the negative power supply unit, and the drain of the second MOS transistor is electrically connected to the negative power supply output of the negative power supply unit.

[0021] One end of the second voltage divider resistor is electrically connected to the gate of the second MOS transistor, and the other end of the second voltage divider resistor is electrically connected to the negative power supply bus of the negative power supply unit. The negative power supply output of the negative power supply unit serves as the power supply output terminal of the negative power supply module and is electrically connected to the negative voltage power supply input terminal of the external load appliance.

[0022] In one possible design, both the first MOSFET and the second MOSFET are N-channel MOSFETs, the first voltage divider resistor, the second voltage divider resistor, and the delay conduction resistor are all 10kΩ resistors, the second diode and the third diode are both 15V Zener diodes, the positive power supply unit uses a positive 12V power supply, and the negative power supply unit uses a negative 12V power supply.

[0023] Beneficial Effects: This utility model provides a circuit for simultaneously controlling the on / off switching of positive and negative power supplies, including: a power on / off control module, a positive power supply module, and a negative power supply module; wherein, the input terminal of the power on / off control module is electrically connected to an external start control signal, the control signal output terminal of the power on / off control module is electrically connected to the input terminal of the positive power supply module, and the power supply output terminal of the positive power supply module is electrically connected to the positive voltage power supply input terminal of an external load appliance; the control signal output terminal of the power on / off control module is also electrically connected to the input terminal of the negative power supply module, and the power supply output terminal of the negative power supply module is electrically connected to the negative voltage power supply input terminal of an external load appliance. By receiving the external start control signal through the power on / off control module, and utilizing the coordinated design of the positive and negative power supply modules, synchronous switching control of the positive and negative power supplies is achieved using MOSFETs. The absence of mechanical contacts in electromagnetic relays avoids the problem of poor mechanical contact. Furthermore, the MOSFETs have a larger operating current and lower conduction losses, effectively reducing power consumption. Attached Figure Description

[0024] Figure 1 This is a functional block diagram of the circuit that simultaneously controls the on / off state of positive and negative power supplies in Embodiment 1 of this utility model;

[0025] Figure 2 This is a circuit connection diagram of the circuit that simultaneously controls the on / off state of positive and negative power supplies in Embodiment 2 of this utility model.

[0026] The components include: 1. Power on / off control module; 2. Positive power supply module; 3. Negative power supply module; 4. External load electrical appliance; 5. Start control signal.

[0027] D1, first diode; D2, second diode; D3, third diode; R1, current-limiting resistor; R2, current-regulating resistor; R3, time-delay on-resistance; R4, first voltage divider resistor; R5, second voltage divider resistor; Q1, first transistor; Q2, second transistor; Q3, first MOSFET; Q4, second MOSFET. Detailed Implementation

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0029] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit, without departing from the scope of the exemplary embodiments of this utility model.

[0030] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.

[0031] Example 1:

[0032] like Figure 1 As shown, this embodiment provides a circuit for simultaneously controlling the on / off state of positive and negative power supplies, including: a power supply on / off control module 1, a positive power supply module 2, and a negative power supply module 3;

[0033] The input terminal of the power supply on / off control module 1 is electrically connected to the external start control signal 5, the control signal output terminal of the power supply on / off control module 1 is electrically connected to the input terminal of the positive power supply module 2, and the power supply output terminal of the positive power supply module 2 is electrically connected to the positive voltage power supply input terminal of the external load appliance 4.

[0034] The control signal output terminal of the power on / off control module 1 is also electrically connected to the input terminal of the negative power supply module 3, and the power supply output terminal of the negative power supply module 3 is electrically connected to the negative voltage power supply input terminal of the external load appliance 4.

[0035] It should be noted that the power on / off control module receives the external start control signal. At the same time, by using the collaborative design of the positive and negative power supply modules, the synchronous switching control of the positive and negative power supplies is achieved using MOSFETs. There are no mechanical contacts of electromagnetic relays, which avoids the problem of poor contact of mechanical contacts. In addition, the MOSFETs have a larger operating current and lower conduction loss, which can effectively reduce power consumption.

[0036] Example 2:

[0037] like Figure 2As shown, this embodiment provides a circuit that simultaneously controls the on / off state of positive and negative power supplies. In one possible implementation, the power supply on / off control module 1 includes a first diode D1, a start signal receiving unit, and an auxiliary power supply unit.

[0038] The input terminal of the start signal receiving unit serves as the input terminal of the power supply on / off control module 1 and is electrically connected to the external start control signal 5. The output terminal of the start signal receiving unit is electrically connected to the auxiliary bus of the auxiliary power supply unit. One end of the first diode D1 is grounded, and the other end of the first diode D1 is electrically connected to the start signal receiving unit. The common terminal of the first diode D1 and the start signal receiving unit serves as the control signal output terminal of the power supply on / off control module 1 and is electrically connected to the input terminal of the positive power supply module 2 and the input terminal of the negative power supply module 3, respectively.

[0039] It should be noted that in actual implementation, the start control signal 5 can be a 5V start signal input to the start signal receiving unit.

[0040] In one possible implementation, the start signal receiving unit includes a current-limiting resistor R1, a current-regulating resistor R2, a first transistor Q1, and a second transistor Q2.

[0041] In this configuration, one end of the current-limiting resistor R1 serves as the input terminal of the start signal receiving unit, electrically connected to the external start control signal 5. The other end of the current-limiting resistor R1 is electrically connected to the base of the first transistor Q1, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is electrically connected to one end of the current-stabilizing resistor R2, the other end of the current-stabilizing resistor R2 is electrically connected to the base of the second transistor Q2, the emitter of the second transistor Q2 serves as the output terminal of the start signal receiving unit, electrically connected to the auxiliary bus (24V auxiliary bus) of the auxiliary power supply, the collector of the second transistor Q2 is electrically connected to the first diode D1, and the collector of the second transistor Q2 serves as the control signal output terminal of the power supply on / off control module 1, electrically connected to the input terminals of the positive power supply module 2 and the negative power supply module 3, respectively.

[0042] In one possible implementation, the first transistor Q1 is an NPN transistor, the second transistor Q2 is a PNP transistor, and the auxiliary power supply unit uses a 24V auxiliary power supply.

[0043] In one possible implementation, the positive power supply module 2 includes a delay on-resistance R3, a first MOSFET Q3, a third diode D3, and a positive power supply unit.

[0044] The positive power supply unit includes a positive power bus and a positive power output. One end of the delay-on resistor R3 serves as the input terminal of the positive power module 2 and is electrically connected to the control signal output terminal of the power on / off control module 1. The other end of the delay-on resistor R3 is electrically connected to the gate of the first MOSFET Q3. The source of the first MOSFET Q3 is electrically connected to the positive power output (positive 12V output) of the positive power supply unit, and the drain of the first MOSFET Q3 is electrically connected to the positive power bus (positive 12V bus) of the positive power supply unit.

[0045] The third diode D3 is connected in parallel between the gate and the source of the first MOSFET Q3. The positive power output (positive 12V output) of the positive power supply unit serves as the power supply output terminal of the positive power supply module 2 and is electrically connected to the positive voltage power supply input terminal of the external load device 4.

[0046] In one possible implementation, the negative power supply module 3 includes a first voltage divider resistor R4, a second voltage divider resistor R5, a second diode D2, a second MOSFET Q4, and a negative power supply unit.

[0047] The negative power supply unit includes a negative power supply bus and a negative power supply output. One end of the first voltage divider resistor R4 serves as the input terminal of the negative power supply module 3 and is electrically connected to the control signal output terminal of the power supply on / off control module 1. The other end of the first voltage divider resistor R4 is electrically connected to the gate of the second MOSFET Q4 through the second diode D2. The source of the second MOSFET Q4 is electrically connected to the negative power supply bus (negative 12V bus) of the negative power supply unit, and the drain of the second MOSFET Q4 is electrically connected to the negative power supply output (negative 12V output) of the negative power supply unit.

[0048] One end of the second voltage divider resistor R5 is electrically connected to the gate of the second MOS transistor Q4, and the other end of the second voltage divider resistor R5 is electrically connected to the negative power supply bus of the negative power supply unit. The negative power supply output (negative 12V output) of the negative power supply unit serves as the power supply output terminal of the negative power supply module 3 and is electrically connected to the negative voltage power supply input terminal of the external load appliance 4.

[0049] In one possible implementation, both the first MOSFET Q3 and the second MOSFET Q4 are N-channel MOSFETs, the first voltage divider resistor R4, the second voltage divider resistor R5 and the delay conduction resistor R3 are all 10kΩ resistors, the second diode D2 and the third diode D3 are both 15V Zener diodes, the positive power supply unit uses a positive 12V power supply, and the negative power supply unit uses a negative 12V power supply.

[0050] It should be noted that, as Figure 2As shown, in practical implementation, the circuit that simultaneously controls the on / off state of positive and negative power supplies provided in this embodiment can be used to implement the following process:

[0051] Among them, the current limiting resistor R1 is a 1kΩ resistor, the current regulating resistor R2, the time delay conduction resistor R3, the first voltage divider resistor R4 and the second voltage divider resistor R5 are 10kΩ resistors, the first transistor Q1 is an NPN transistor, the second transistor Q2 is a PNP transistor, the first MOSFET Q3 and the second MOSFET Q4 are both N-channel MOSFETs, the first transistor D1 is a general diode, and the second diode D2 and the third diode D3 are both 15V Zener diodes.

[0052] When the circuit in this embodiment is in the off state, there is no start control signal 5. The first transistor Q1 is cut off, and the second transistor Q2 is cut off. At this time, the zero potential point reaches the negative 12V bus through the first transistor D1, the first voltage divider resistor R4, the second diode D2, and the second voltage divider resistor R5. Since the second diode D2 is a 15V Zener diode, the voltage applied across it is 12V, so the second diode D2 is cut off. The gate (G) voltage of the first MOSFET Q3 is 0, so the first MOSFET Q3 is cut off. The gate (G) voltage of the second MOSFET Q4 is -12V, but the source (S) voltage of the second MOSFET Q4 is also -12V, so the second MOSFET Q4 is cut off.

[0053] When the circuit of this embodiment is in the off state, the 5V start control signal 5 is sent to the power on / off control module 1, the first transistor Q1 is turned on, the second transistor Q2 is turned on, at this time, the 24V auxiliary power supply unit is connected to the circuit, the gate (G) of the first MOSFET Q3 is charged through the delay conduction resistor R3, the voltage rises, the first MOSFET Q3 is turned on, and the positive 12V bus is connected to the external load device 4; at the same time, the gate (G) voltage of the first MOSFET Q3 is 24V, the source (S) voltage of the first MOSFET Q3 is 12V, therefore, the first MOSFET Q3 remains in the conducting state. At this time, the 24V voltage reaches the negative 12V bus through the first voltage divider resistor R4, the second diode D2 and the second voltage divider resistor R5, and the second diode D2 is turned on, entering the working state. The voltage across the first voltage divider resistor R4 is about 10V, the voltage across the second voltage divider resistor R5 is about 10V, the second MOSFET Q4 is turned on, and the negative 12V bus is connected to the external load device 4.

[0054] The third diode D3 is used to prevent the voltage between the gate and source of the first MOSFET Q3 from exceeding 15V during transient processes.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A circuit that simultaneously controls the on / off state of positive and negative power supplies, characterized in that, comprising: Power supply on / off control module (1), positive power supply module (2) and negative power supply module (3); The input terminal of the power supply on / off control module (1) is electrically connected to the external start control signal (5), the control signal output terminal of the power supply on / off control module (1) is electrically connected to the input terminal of the positive power supply module (2), and the power supply output terminal of the positive power supply module (2) is electrically connected to the positive voltage power supply input terminal of the external load appliance (4). The control signal output terminal of the power on / off control module (1) is also electrically connected to the input terminal of the negative power supply module (3), and the power supply output terminal of the negative power supply module (3) is electrically connected to the negative voltage power supply input terminal of the external load appliance (4).

2. The circuit for simultaneously controlling the on / off state of positive and negative power supplies according to claim 1, characterized in that, The power on / off control module (1) includes a first diode (D1), a start signal receiving unit, and an auxiliary power supply unit; The input terminal of the start signal receiving unit serves as the input terminal of the power supply on / off control module (1) and is electrically connected to an external start control signal (5). The output terminal of the start signal receiving unit is electrically connected to the auxiliary bus of the auxiliary power supply unit. One end of the first diode (D1) is grounded, and the other end of the first diode (D1) is electrically connected to the start signal receiving unit. The common terminal of the first diode (D1) and the start signal receiving unit serves as the control signal output terminal of the power supply on / off control module (1) and is electrically connected to the input terminal of the positive power supply module (2) and the input terminal of the negative power supply module (3), respectively.

3. The circuit for simultaneously controlling the on / off state of positive and negative power supplies according to claim 2, characterized in that, The start signal receiving unit includes a current-limiting resistor (R1), a current-regulating resistor (R2), a first transistor (Q1), and a second transistor (Q2); One end of the current-limiting resistor (R1) serves as the input terminal of the start signal receiving unit and is electrically connected to the external start control signal (5). The other end of the current-limiting resistor (R1) is electrically connected to the base of the first transistor (Q1). The emitter of the first transistor (Q1) is grounded. The collector of the first transistor (Q1) is electrically connected to one end of the current-stabilizing resistor (R2). The other end of the current-stabilizing resistor (R2) is electrically connected to the base of the second transistor (Q2). The emitter of the second transistor (Q2) serves as the output terminal of the start signal receiving unit and is electrically connected to the auxiliary bus of the auxiliary power supply. The collector of the second transistor (Q2) is electrically connected to the first diode (D1). The collector of the second transistor (Q2) serves as the control signal output terminal of the power supply on / off control module (1) and is electrically connected to the input terminals of the positive power supply module (2) and the negative power supply module (3), respectively.

4. The circuit for simultaneously controlling the on / off state of positive and negative power supplies according to claim 3, characterized in that, The first transistor (Q1) is an NPN transistor, the second transistor (Q2) is a PNP transistor, and the auxiliary power supply unit uses a 24V auxiliary power supply.

5. The circuit for simultaneously controlling the on / off state of positive and negative power supplies according to claim 1, characterized in that, The positive power supply module (2) includes a delay on-resistor (R3), a first MOSFET (Q3), a third diode (D3), and a positive power supply unit; The positive power supply unit includes a positive power supply bus and a positive power supply output. One end of the delay-on resistor (R3) serves as the input terminal of the positive power supply module (2) and is electrically connected to the control signal output terminal of the power supply on / off control module (1). The other end of the delay-on resistor (R3) is electrically connected to the gate of the first MOS transistor (Q3). The source of the first MOS transistor (Q3) is electrically connected to the positive power supply output of the positive power supply unit, and the drain of the first MOS transistor (Q3) is electrically connected to the positive power supply bus of the positive power supply unit. The third diode (D3) is connected in parallel between the gate and source of the first MOS transistor (Q3). The positive power output of the positive power supply unit serves as the power supply output terminal of the positive power supply module (2) and is electrically connected to the positive voltage power supply input terminal of the external load device (4).

6. The circuit for simultaneously controlling the on / off state of positive and negative power supplies according to claim 5, characterized in that, The negative power supply module (3) includes a first voltage divider resistor (R4), a second voltage divider resistor (R5), a second diode (D2), a second MOSFET (Q4), and a negative power supply unit; The negative power supply unit includes a negative power supply bus and a negative power supply output. One end of the first voltage divider resistor (R4) serves as the input terminal of the negative power supply module (3) and is electrically connected to the control signal output terminal of the power supply on / off control module (1). The other end of the first voltage divider resistor (R4) is electrically connected to the gate of the second MOS transistor (Q4) through the second diode (D2). The source of the second MOS transistor (Q4) is electrically connected to the negative power supply bus of the negative power supply unit, and the drain of the second MOS transistor (Q4) is electrically connected to the negative power supply output of the negative power supply unit. One end of the second voltage divider resistor (R5) is electrically connected to the gate of the second MOS transistor (Q4), and the other end of the second voltage divider resistor (R5) is electrically connected to the negative power supply bus of the negative power supply unit. The negative power supply output of the negative power supply unit serves as the power supply output terminal of the negative power supply module (3) and is electrically connected to the negative voltage power supply input terminal of the external load appliance (4).

7. The circuit for simultaneously controlling the on / off state of positive and negative power supplies according to claim 6, characterized in that, Both the first MOSFET (Q3) and the second MOSFET (Q4) are N-channel MOSFETs. The first voltage divider resistor (R4), the second voltage divider resistor (R5), and the delay conduction resistor (R3) are all 10kΩ resistors. The second diode (D2) and the third diode (D3) are both 15V Zener diodes. The positive power supply unit uses a positive 12V power supply, and the negative power supply unit uses a negative 12V power supply.

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