CN217769849U - Discharge circuit, mainboard and electronic equipment - Google Patents
Discharge circuit, mainboard and electronic equipment Download PDFInfo
- Publication number
- CN217769849U CN217769849U CN202220975209.XU CN202220975209U CN217769849U CN 217769849 U CN217769849 U CN 217769849U CN 202220975209 U CN202220975209 U CN 202220975209U CN 217769849 U CN217769849 U CN 217769849U
- Authority
- CN
- China
- Prior art keywords
- circuit
- controllable element
- controllable
- conversion circuit
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The application provides a discharge circuit, mainboard and electronic equipment, this discharge circuit is applied to the mainboard, includes in the discharge circuit: a control circuit for receiving a control signal, a load circuit, and at least one first controllable element; the first end of the load circuit is used for being connected with the first end of the power supply conversion circuit, and the second end of the load circuit is connected with the first end of the first controllable element; the second end of the first controllable element is grounded; the first end of the control circuit and the third end of the first controllable element are used for being connected to the second end of the power supply conversion circuit in parallel; the second end of the control circuit is grounded; when the control circuit receives a low-level control signal, the control circuit is switched off, so that the first controllable element is switched on after the first power supply signal output by the power conversion circuit is transmitted to the third end of the first controllable element, and the load circuit discharges through the first controllable element, thereby avoiding the phenomenon that the mainboard cannot be normally started due to longer discharging time required by the mainboard when the mainboard is started immediately after the mainboard is shut down.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a discharge circuit, a mainboard and electronic equipment.
Background
In an electronic device, a main board is generally provided, and transmission and processing of signals in the electronic device are realized based on the main board.
In some application scenarios, when a user controls a motherboard to stop working, a voltage value of a bus voltage signal originally used for supplying power to the motherboard is reduced until the voltage value is reduced below a working voltage value required by the motherboard. If the voltage value of the bus voltage signal is reduced and the voltage value of the bus voltage signal is not reduced to the working voltage value, the user controls the mainboard to start working again, and at the moment, the load on the mainboard is in an undervoltage protection state due to the fact that the voltage value of the bus voltage signal is low, and therefore the mainboard cannot be started normally.
Therefore, in order to avoid the phenomenon that the mainboard cannot be normally started when the mainboard is controlled to start to work immediately after the mainboard stops working due to long discharge time of the mainboard, how to reduce the discharge time consumption of the bus voltage signal is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The application provides a discharge circuit, mainboard and electronic equipment for solve the problem that the mainboard discharge time is longer and the unable normal start of mainboard that leads to among the correlation technique.
In a first aspect, the present application provides a discharge circuit applied to a motherboard, the discharge circuit includes: a control circuit for receiving a control signal, a load circuit, and at least one first controllable element;
the first end of the load circuit is used for being connected with the first end of the power supply conversion circuit, and the second end of the load circuit is connected with the first end of the first controllable element; a second end of the first controllable element is grounded;
the first end of the control circuit and the third end of the first controllable element are used for being connected to the second end of the power supply conversion circuit in parallel; the second end of the control circuit is grounded;
when the control circuit receives a low-level control signal, the control circuit is turned off, so that the first controllable element is turned on after the first power supply signal output by the power conversion circuit is transmitted to the third end of the first controllable element, and the load circuit discharges through the first controllable element.
In one possible implementation, the load circuit includes at least one load unit including a first resistive element and a second resistive element connected in parallel;
the first end of the first resistance element is used for being connected with the first end of the power supply conversion circuit, and the second end of the first resistance element is connected with the first end of the first controllable element; the first end of the second resistance element is used for being connected with the first end of the power supply conversion circuit, and the second end of the second resistance element is connected with the first end of the first controllable element.
In one possible implementation, the first controllable element is a first metal-oxide semiconductor field effect transistor;
wherein a drain of the first metal-oxide semiconductor field effect transistor is connected to a second end of the load circuit as a first end of the first controllable element, and a source of the first metal-oxide semiconductor field effect transistor is grounded as a second end of the first controllable element; the grid electrode of the first metal-oxide semiconductor field effect transistor is used as the third end of the first controllable element, and is connected with the first end of the control circuit in parallel to the second end of the power supply conversion circuit.
In one possible implementation, the first metal-oxide semiconductor field effect transistor is an N-type metal-oxide semiconductor field effect transistor.
In one possible implementation, the control circuit includes: a second controllable element;
the first end of the second controllable element and the third end of the first controllable element are used for being connected to the second end of the power conversion circuit in parallel, and the second end of the second controllable element is grounded; and if the second controllable element receives a low-level control signal, the second controllable element is turned off.
In one possible implementation, the discharge circuit further includes a second current limiting element; the control circuit further includes: a first current limiting element;
the first end of the first current limiting element is connected with the third end of the second controllable element, the first end of the second controllable element is connected with the first end of the second current limiting element and the third end of the first controllable element, and the second end of the second current limiting element is used for being connected with the second end of the power conversion circuit.
In one possible implementation, the control circuit further includes: a first capacitive element and a third resistive element;
the first end of the first capacitor element is connected with the second end of the first current limiting element, the first end of the third resistor element and the third end of the second controllable element; a second end of the first capacitive element is grounded; a second end of the third resistive element is grounded.
In one possible implementation, the second controllable element is a second metal-oxide semiconductor field effect transistor;
the drain of the second metal-oxide semiconductor field effect transistor is used as the first end of the second controllable element, and the drain of the second metal-oxide semiconductor field effect transistor and the third end of the first controllable element are used for being connected to the second end of the power conversion circuit in parallel; the source of the second metal-oxide semiconductor field effect transistor is used as the second end of the second controllable element and is grounded.
In one possible implementation, the discharge circuit further includes: the power supply conversion circuit; wherein the content of the first and second substances,
if the power conversion circuit receives a low-level control signal, the power conversion circuit performs voltage reduction processing on the obtained mains supply signal to obtain a first power supply signal;
if the power conversion circuit receives a high-level control signal, the power conversion circuit performs voltage reduction processing on the obtained commercial power signal to obtain the first power supply signal and a second power supply signal which is used for being transmitted to the first end of the load circuit.
In a possible implementation manner, when the control circuit receives a control signal with a high level, the control circuit is turned on, so that the first power supply signal output by the power conversion circuit is grounded through the control circuit.
In a second aspect, the present application provides a main board comprising a discharge circuit according to any one of the first aspect.
In a third aspect, the present application provides an electronic device comprising a discharge circuit as defined in any one of the first aspect.
The application provides a discharge circuit, mainboard and electronic equipment, this discharge circuit is applied to the mainboard, includes in the discharge circuit: a control circuit for receiving a control signal, a load circuit, and at least one first controllable element; the first end of the load circuit is used for being connected with the first end of the power supply conversion circuit, and the second end of the load circuit is connected with the first end of the first controllable element; a second end of the first controllable element is grounded; the first end of the control circuit and the third end of the first controllable element are used for being connected to the second end of the power supply conversion circuit in parallel; the second end of the control circuit is grounded; when the control circuit receives a low-level control signal, the control circuit is turned off, so that the first controllable element is turned on after the first power supply signal output by the power conversion circuit is transmitted to the third end of the first controllable element, and the load circuit discharges through the first controllable element. The signal on the connecting line between the power conversion circuit and the load circuit can be transmitted to the ground through the load circuit and the first controllable element, so that the phenomenon that the mainboard cannot be normally started when the mainboard is started immediately after the mainboard is shut down due to long signal discharge time on a bus on the mainboard is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a first discharge circuit according to an embodiment of the present disclosure;
FIG. 2 is a circuit diagram of a first discharge circuit according to another embodiment of the present application;
fig. 3 is a circuit diagram of a second discharge circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a second discharge circuit according to yet another embodiment of the present application;
fig. 5 is a schematic structural diagram of a third discharge circuit according to an embodiment of the present application;
fig. 6 is a circuit diagram of a third discharge circuit according to yet another embodiment of the present application.
Specific embodiments of the present application have been shown by way of example in the drawings and will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Currently, in an electronic device (for example, a computer, a server, or the like), a main board is generally provided. The mainboard can realize the transmission of various signals in the electronic equipment through the circuit arranged on the mainboard, and the mainboard is also related to the reading and writing of the memory in the electronic equipment and the control of the peripheral equipment of the electronic equipment.
When the mainboard needs to be controlled to stop working, the power supply signal (namely, the voltage signal on the bus) received by the mainboard is subjected to discharge processing. However, because the discharging speed of the current motherboard is relatively slow, when the motherboard has not discharged, if the user controls the motherboard to work again, then at this moment, because the motherboard is in the discharging process, the voltage value of the power supply signal at this moment cannot meet the power supply requirement of the load on the motherboard, so that the load on the motherboard is in an under-voltage protection state, and further the motherboard cannot be normally started, for example, the phenomenon that the fan on the motherboard cannot normally rotate occurs.
For example, when testing a motherboard in a server, it is found that some abnormal phenomena, such as the failure of a fan in a chassis, may occur when the motherboard is immediately controlled to start operating after stopping operating. The reason for this problem is that the bus voltage signal of 12V (i.e., the power supply signal provided to the fan) is slowly powered down after the motherboard stops operating, and can only fall below 3V (i.e., the operating voltage provided by the fan) within about 4 s. If the mainboard is controlled to start to work in 1s after stopping working, the loads such as fans in the mainboard can easily enter an under-voltage protection state, and the loads on the mainboard can not be started normally.
In one example, in order to increase the discharging speed of the main board, a discharging resistor may be connected to a bus bar of the main board. However, in the above implementation, when the motherboard works normally, the discharge resistor disposed on the bus increases the power consumption of the system, which results in power waste.
The application provides a discharge circuit, mainboard and electronic equipment aims at solving prior art technical problem as above.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first discharge circuit according to an embodiment of the present disclosure. As shown in fig. 1, the discharge circuit provided in this embodiment includes: a control circuit for receiving a control signal, a load circuit, and at least one first controllable element; the first end of the load circuit is used for being connected with the first end of the power supply conversion circuit, and the second end of the load circuit is connected with the first end of the first controllable element; the second end of the first controllable element is grounded; the first end of the control circuit and the third end of the first controllable element are used for being connected to the second end of the power supply conversion circuit in parallel; the second end of the control circuit is grounded; when the control circuit receives a low-level control signal, the control circuit is turned off, so that the first controllable element is turned on after the first power supply signal output by the power conversion circuit is transmitted to the third end of the first controllable element, and the load circuit discharges through the first controllable element.
The discharge circuit provided by the application is applied to a mainboard, and a load circuit, a first controllable element and a control circuit are arranged in the discharge circuit. The first end of the load circuit is connected with the first end of the power conversion circuit. In practical applications, an electrical connection line between the first end of the load circuit and the first end of the power conversion circuit is called a bus, and when the motherboard operates, the power conversion circuit can transmit a first power supply signal through the bus to supply power to a load on the motherboard. The structure of the discharge circuit shown in fig. 1 is illustrated by way of example as including only one first controllable element.
In addition, the second end of the load circuit is connected with the first end of the first controllable element, the second end of the first controllable element is grounded, the third end of the first controllable element and the first end of the control circuit are connected to the second end of the power conversion circuit in parallel, and the second end of the control circuit is grounded.
And the control circuit is provided with a port for receiving a control signal, wherein the level value of the control signal can be used for representing the working state of the current mainboard, and when the control signal is at a high level, the control circuit is used for representing that the user controls the mainboard to be in the working state at the moment. When the control signal is a low level signal, the control signal is used for representing that the user controls the mainboard to be in a stop working state at the moment. In an example, the control signal in this embodiment may be generated by a detection circuit, and the detection circuit may be configured to receive a control instruction, which is input by a user and used for indicating an operating state of the motherboard, and further generate a control signal corresponding to the control instruction.
When the control signal received by the control circuit is a low level signal, the control circuit is in a turn-off state, that is, the first end of the control circuit and the second end of the control circuit are turned off at the time. Furthermore, a first power supply signal output by the power conversion circuit connected with the first end of the control circuit is transmitted to the third end of the first controllable element connected with the second end of the power conversion circuit, after the third end of the first controllable element receives the first power supply signal, the first controllable element is in a conducting state, namely the first end of the first controllable element is conducted with the second end of the first controllable element, at the moment, a signal on the bus received by the load circuit connected with the first end of the first controllable element can sequentially pass through the load circuit, the first end of the first controllable element connected with the second end of the load circuit, and the second end of the first controllable element is transmitted to the ground, so that the discharging of the mainboard is realized.
In this embodiment, by providing the control circuit, the first controllable element and the load circuit connected to the first controllable element, further, when the control circuit receives a low-level control signal, at this time, the control circuit is in an off state based on the received low-level signal, the first power supply signal output by the power conversion circuit can be transmitted to the first controllable element to turn on the first controllable element, and the load circuit can be grounded through the first controllable element, so as to achieve discharging, that is, a signal on a connection line (i.e., a bus) between the power conversion circuit and the load circuit can be transmitted to the ground through the load circuit and the first controllable element, so as to avoid a phenomenon that the motherboard cannot be normally started due to a long signal discharging time on the bus on the motherboard.
In some embodiments, on the basis of the above embodiments, when the control circuit receives the control signal with a high level, the control circuit is turned on, so that the first power supply signal output by the power conversion circuit is grounded through the control circuit.
For example, in this embodiment, when the control signal received by the control circuit is a high-level signal, the control circuit is turned on at this time, that is, the first terminal of the control circuit and the second terminal of the control circuit are turned on, and at this time, the first power supply signal output by the power conversion circuit may be sequentially transmitted to the ground through the first terminal of the control circuit and the second terminal of the control circuit. At this time, the first controllable element is in an off state, and the second power supply signal generated by the power conversion circuit can be transmitted to the rest of the loads on the motherboard through the bus, so that the rest of the loads on the motherboard can work normally.
In this embodiment, the control circuit may be in an on state or an off state based on the level value of the received control signal, and further change the transmission path of the first power supply signal output by the power conversion circuit by adjusting the state of the control circuit. When the control signal is at a high level, the control circuit is in a conducting state, and the first power supply signal output by the power conversion circuit can be transmitted to the ground through the control circuit. The second power supply signal output by the power conversion circuit can supply power to a load on the mainboard.
Fig. 2 is a circuit diagram of a first discharging circuit according to another embodiment of the present disclosure. In the discharge circuit provided in the present embodiment, at least one load unit is included in the load circuit, and the load unit includes a first resistance element and a second resistance element connected in parallel. The first end of the first resistance element is used for being connected with the first end of the power supply conversion circuit, and the second end of the first resistance element is connected with the first end of the first controllable element; the first end of the second resistance element is used for being connected with the first end of the power supply conversion circuit, and the second end of the second resistance element is connected with the first end of the first controllable element.
Exemplarily, as shown in fig. 2, on the basis of the structural block diagram of the discharge circuit shown in fig. 1, the load circuit in fig. 2 includes a load unit composed of a first resistance element R1 and a second resistance element R2, and the first resistance element R1 and the second resistance element R2 are connected in parallel, wherein a first end of the first resistance element R1 is connected to a first end of the power conversion circuit, and a second end of the first resistance element R1 is connected to a first end of the first controllable element. A first end of the second resistive element R2 is connected to a first end of the power conversion circuit, and a second end of the second resistive element R2 is connected to a first end of the first controllable element R1. When the control signal is a low-level signal, the first power supply signal output by the power conversion circuit can be transmitted to the third end of the first controllable element connected with the first end of the power conversion circuit at the moment, so that the first controllable element is turned on, the first resistance element and the second resistance element can discharge through the first controllable element, and the level value of the signal on the bus connected with the first resistance element R1 and the second resistance element R2 is rapidly reduced.
In practical application, when the discharge circuit is applied to a motherboard in a server, at this time, the resistance of the first resistance element is 220 ohms, and the resistance of the second resistance element is 220 ohms, and further, the power consumption born by the load circuit in the discharge process is increased by selecting a parallel connection mode of two 220-ohm resistors.
Furthermore, in some embodiments, in order to increase the current capacity of the load circuit and to increase the discharge speed of the load circuit, a plurality of load units and a plurality of first controllable elements may be provided in the load circuit. For example, fig. 3 is a schematic circuit diagram of a second discharge circuit according to an embodiment of the present disclosure, as shown in fig. 3, based on the structure of the discharge circuit shown in fig. 2, the load circuit in fig. 3 includes four parallel resistor elements (in the figure, four resistors are denoted by R3, R4, R5, and R6), and two first controllable elements are further provided, wherein first ends of the four parallel resistor elements are all connected to a first end of the power conversion circuit, second ends of the four parallel resistor elements are connected to first ends of the two first controllable elements, second ends of the two first controllable elements are connected to ground, and third ends of the two first controllable elements are connected to a second end of the control circuit in parallel.
In this embodiment, the resistance of the load circuit can be reduced by providing a plurality of parallel-connected resistance elements, the current capacity of the load circuit can be increased, and meanwhile, a plurality of first controllable elements can be provided to shunt signals output by the load circuit, so as to ensure that the first controllable elements are not burned out, and further improve the discharge speed.
In practical applications, in the discharge circuit provided in any of the above embodiments, wherein the first controllable element is a first metal-oxide semiconductor field effect transistor; the drain of the first metal-oxide semiconductor field effect transistor is used as the first end of the first controllable element and is connected with the second end of the load circuit, and the source of the first metal-oxide semiconductor field effect transistor is used as the second end of the first controllable element and is grounded; the grid of the first metal-oxide semiconductor field effect transistor is used as the third end of the first controllable element, and the grid and the first end of the control circuit are connected to the second end of the power supply conversion circuit in parallel.
In an exemplary embodiment, the first controllable element is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and compared with a Transistor as the first controllable element, the MOSFET has a higher switching speed, so that the switching speed of the first controllable element can be increased to reduce the time consumption for discharging.
In addition, in practical applications, the first metal-oxide semiconductor field effect transistor may be an N-type metal-oxide semiconductor field effect transistor. Compared with the selective P-type metal-oxide semiconductor field effect transistor, the N-type metal-oxide semiconductor field effect transistor is easier to obtain, and the power consumption of the N-type metal-oxide semiconductor field effect transistor is lower, so that the power consumption of the power conversion circuit can be reduced.
In some embodiments, on the basis of any of the above embodiments, the control circuit in this embodiment includes: a second controllable element; the first end of the second controllable element and the third end of the first controllable element are used for being connected to the second end of the power conversion circuit in parallel, and the second end of the second controllable element is grounded; if the second controllable element receives the control signal of low level, the second controllable element is turned off.
Illustratively, the control circuit in this embodiment may be implemented by providing a second controllable element. The second controllable element is provided with three ports, the first end of the second controllable element and the third end of the first controllable element are connected to the second end of the power supply conversion circuit in parallel, and the second end of the second controllable element is grounded. In practical applications, the third terminal of the second controllable element may be connected to the detection circuit for receiving the control signal generated by the detection circuit. When the control signal generated by the detection circuit is a low level signal, the second controllable element is turned off, that is, the first end of the second controllable element and the second end of the second controllable element are turned off. In one example, when the control signal generated by the detection circuit is a high level signal, the second controllable element is turned on, that is, the first terminal of the second controllable element is turned on with the second terminal of the second controllable element. Furthermore, the second controllable element is arranged in the control circuit, so that the phenomenon that the mainboard cannot be normally started when the mainboard is controlled to start to work immediately after stopping working can be avoided.
In practical applications, the second controllable element may be a second metal-oxide semiconductor field effect transistor. The drain of the second metal-oxide semiconductor field effect transistor is used as the first end of the second controllable element, and the drain and the third end of the first controllable element are used for being connected to the second end of the power conversion circuit in parallel; the source of the second metal-oxide semiconductor field effect transistor is used as the second end of the second controllable element and is grounded. In addition, in a practical application scenario, the gate of the second metal-oxide semiconductor field effect transistor may be connected to the detection circuit, so as to receive the control signal sent by the detection circuit. Compared with the triode selected as the second controllable element, the metal-oxide semiconductor field effect transistor has higher switching speed, so that the switching speed of the first controllable element can be increased, and the time consumed by discharging can be reduced.
In addition, in the practical application process, the second controllable element can also select an N-type metal-oxide semiconductor field effect transistor, the N-type metal-oxide semiconductor field effect transistor is easier to obtain than a P-type metal-oxide semiconductor field effect transistor, and the power consumption of the N-type metal-oxide semiconductor field effect transistor is lower, so that the power consumption of the power conversion circuit can be reduced.
Fig. 4 is a schematic structural diagram of a second discharge circuit according to another embodiment of the present application, where the control circuit includes: the first current limiting element and the second controllable element, and the discharge circuit also comprises a second current limiting element.
The first end of the first current limiting element is connected with the third end of the second controllable element, the first end of the second controllable element is connected with the first end of the second current limiting element and the third end of the first controllable element, and the second end of the second current limiting element is used for being connected with the second end of the power supply conversion circuit.
For example, the first current limiting element in this embodiment may be configured to receive a control signal generated by the detection circuit, and after the control signal is processed by the current limiting element, the processed signal is transmitted to the third terminal of the second controllable element connected to the first terminal of the first current limiting element. In addition, a second current limiting element is further provided in this embodiment, wherein a first end of the second current limiting element is connected to a first end of the second controllable element and a third end of the first controllable element. When the second controllable element receives a low-level signal, the second controllable element is turned off, and a first power supply signal output by the power conversion circuit is transmitted to the first controllable element connected with the second current limiting element through the second current limiting element connected with the second end of the power conversion circuit, so that the first controllable element is turned on. In addition, when the second controllable element receives a high-level signal, at this time, the second controllable element is turned on, and the first power supply signal output by the power conversion circuit is transmitted to the second controllable element connected with the second current limiting element through the second current limiting element connected with the power conversion circuit and is transmitted to the ground through the second controllable element.
It should be noted that the types of the first current limiting element and the second current limiting element in this embodiment are not particularly limited. The first current limiting element may be a resistor element, and the second current limiting element may also be a resistor element.
In this embodiment, the first current limiting element is provided to protect the second controllable element. And a second current limiting element is also arranged, so that the first controllable element or the second controllable element can be prevented from being burnt out when a second power supply signal output by the power conversion circuit is larger.
Fig. 5 is a schematic structural diagram of a third discharge circuit according to an embodiment of the present disclosure. On the basis of the discharge circuit shown in fig. 4, the control circuit provided in this embodiment further includes: a first capacitive element C1 and a third resistive element R7. The first end of the first capacitor element C1 is connected with the second end of the first current limiting element, the first end of the third resistor element R7 and the third end of the second controllable element; the second end of the first capacitive element C1 is grounded; the second terminal of the third resistance element R7 is grounded.
For example, in addition to the structure of the discharge circuit shown in fig. 4, the control circuit in the present embodiment is further provided with a first capacitive element C1 and a third resistive element R7. In practical application, after the first current limiting element receives the control signal generated by the detection circuit, the first current limiting element processes the control signal to obtain a processed signal, and the third resistance element R7 and the first capacitance element C1 connected to the first end of the first current limiting element can be used for adjusting the signal processed by the first current limiting element, so as to reduce time consumption for switching the processed signal from a high level state to a low level state, and further improve the switching-off speed of the second controllable element.
In this embodiment, by providing the first capacitive element C1 and the third resistive element R7, the signal output by the first current limiting element can be adjusted, so as to reduce the time duration consumed when the signal received by the second controllable element is switched from the high level state to the low level state, thereby shortening the discharge time duration.
Fig. 6 is a circuit diagram of a third discharge circuit according to yet another embodiment of the present application. As shown in fig. 6, the discharge circuit provided in this embodiment includes a power conversion circuit, a load circuit composed of a resistance element R3, a resistance element R4, a resistance element R5, and a resistance element R6 connected in parallel, two first controllable elements (denoted by Q2 and Q3 in the figure, respectively), a control circuit composed of a resistance element R7, a resistance element R8, a capacitance element C1, and a second controllable element (denoted by Q1 in the figure), and a resistance element R9. The resistance element R9 serves as a second current limiting element. The resistance element R8 serves as a first current limiting element.
For example, the types of the first controllable element and the second controllable element in this embodiment are both N-type metal-oxide semiconductor field effect transistors. The first end of the power conversion circuit is connected to the first end of the resistor element R3, the first end of the resistor element R4, the first end of the resistor element R5, the first end of the resistor element R6, and a load, where the load may be a fan, a chip, or other load devices that need to be powered, such as other circuits and the like, on the motherboard, and is not limited specifically here. A second terminal of the resistor element R3, a second terminal of the resistor element R4, a second terminal of the resistor element R5, and a second terminal of the resistor element R6 are connected to the drain of the transistor Q1 and the drain of the transistor Q3, respectively. The source of the transistor Q1 and the source of the transistor Q3 are connected to ground. A second terminal of the power conversion circuit is connected to a first terminal of the resistor element R9, and a second terminal of the resistor element R9 is connected to a drain of the transistor Q1, a gate of the transistor Q2, and a gate of the transistor Q3. The source of transistor Q1 is connected to ground. The gate of the transistor Q1 is connected to the first terminal of the resistor R7, the first terminal of the capacitor C1, and the first terminal of the resistor R8, and the second terminal of the resistor R8 is connected to the third terminals of the detection circuit and the power conversion circuit.
The detection circuit can be used for generating a control signal based on a control instruction input by a user, and when the generated control signal is a high-level signal, the detection circuit is used for representing that the user controls the mainboard to be in a working state. And when the generated control signal is a low level signal, the control signal is used for representing that the user controls the mainboard to be in a stop working state. The specific implementation principle and circuit design of the detection circuit are similar to those in the related art, and are not described herein again.
In addition, the third terminal of the power conversion circuit in this embodiment is connected to the detection circuit, and the third terminal of the power conversion circuit may also be used to receive the control signal output by the detection circuit, and when the power conversion circuit receives the low-level control signal, the power conversion circuit performs voltage reduction processing on the obtained commercial power signal to obtain the first power supply signal. For example, after the power conversion circuit receives the low-level control signal, the power conversion circuit may perform voltage reduction on the acquired 220V commercial power signal to obtain the 3.3V first power supply signal, and since the gate of the transistor Q1 is connected to the detection circuit through the resistor element R8, the power conversion circuit may also receive the low-level control signal, and at this time, the transistor Q1 is in an off state. The drain of the transistor Q1, the gate of the transistor Q2, and the gate of the transistor Q3 are connected to the second output terminal of the power conversion circuit through the resistor element R9, and when the transistor Q1 is in an off state, at this time, the first power supply signal output by the second terminal of the power conversion circuit may be transmitted to the gate of the transistor Q2 and the gate of the transistor Q3, so that the transistor Q2 and the transistor Q3 are turned on, and then signals on the connection lines (i.e., bus lines) of the power conversion circuit and the first terminals of the respective resistor elements of the resistor element R3, the resistor element R4, the resistor element R5, and the resistor element R6 may be transmitted to the drain of the transistor Q2 and the drain of the transistor Q3, which are connected to the second terminal of the resistor element R3, the second terminal of the resistor element R4, the second terminal of the resistor element R5, and the second terminal of the resistor element R6, and since the transistor Q2 and the transistor Q3 are in an on state, and the source of the transistor Q2 and the source of the transistor Q3 are grounded, so that the signals are finally discharged to the ground. In addition, the number of the resistive elements in the load circuit and the number of the first controllable elements connected to the load circuit in this embodiment are only for illustration and are not limited in particular. In some embodiments, to further increase the speed of the discharge, the speed of the discharge may be increased by increasing the number of resistive elements in the load circuit. Furthermore, along with the rapid decrease of the level value of the signal on the bus along with the above-mentioned discharging process, the phenomenon that when the user controls the main board to start working after the main board stops working, and the signal level value on the bus decreases too slowly, so that the level value of the signal on the bus rises when the main board starts working, the load on the main board is in an under-voltage protection state due to the low level value of the signal received on the bus, and the main board cannot be started normally is avoided.
When the power conversion circuit receives a high-level control signal, the power conversion circuit performs voltage reduction processing on the obtained commercial power signal to obtain a first power supply signal and a first power supply signal for transmitting to the first end of the load circuit. For example, after the power conversion circuit receives the high-level control signal, the obtained 220V mains signal may be stepped down to obtain a first power supply signal of 3.3V, and then the gate of the transistor Q1 is connected to the detection circuit through the resistor element R8, and the high-level control signal may also be received, at this time, the transistor Q1 is in a conducting state, and the drain of the transistor Q1 is connected to the second end of the power conversion circuit through the resistor element R9, and then the first power supply signal passes through the resistor element R9 and the transistor Q1 in sequence and is transmitted to the ground. And after the power conversion circuit receives the high-level control signal, the obtained 220V commercial power signal can be subjected to voltage reduction processing to obtain a 12V second power supply signal, and then the second power supply signal output by the first end of the power conversion circuit can supply power to the load on the motherboard because the first end of the power conversion circuit is connected with the load on the motherboard and the first controllable element connected with the second end of the first end of the power conversion circuit, which is connected with the load circuit, is in an off state.
In this embodiment, the power conversion circuit is configured to determine the output power supply signal based on the level value of the received control signal, so that when the control signal with a high level is received, the first power supply signal is generated to turn off the control circuit connected in parallel to the power conversion circuit, turn on the first controllable element, accelerate the discharging speed of the load circuit through the first controllable element, and avoid the phenomenon that the motherboard cannot be started normally.
The present application provides a motherboard, wherein the motherboard includes the discharge circuit provided in any of the above embodiments.
The application provides an electronic device, wherein the electronic device comprises the discharge circuit provided by any one of the above embodiments.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (12)
1. A discharge circuit, applied to a motherboard, the discharge circuit comprising: a control circuit for receiving a control signal, a load circuit, and at least one first controllable element;
the first end of the load circuit is used for being connected with the first end of the power supply conversion circuit, and the second end of the load circuit is connected with the first end of the first controllable element; a second end of the first controllable element is grounded;
the first end of the control circuit and the third end of the first controllable element are used for being connected to the second end of the power supply conversion circuit in parallel; the second end of the control circuit is grounded;
when the control circuit receives a low-level control signal, the control circuit is turned off, so that the first controllable element is turned on after the first power supply signal output by the power conversion circuit is transmitted to the third end of the first controllable element, and the load circuit discharges through the first controllable element.
2. The discharge circuit of claim 1, wherein the load circuit comprises at least one load cell comprising a first resistive element and a second resistive element in parallel;
the first end of the first resistance element is used for being connected with the first end of the power supply conversion circuit, and the second end of the first resistance element is connected with the first end of the first controllable element; the first end of the second resistance element is used for being connected with the first end of the power supply conversion circuit, and the second end of the second resistance element is connected with the first end of the first controllable element.
3. The discharge circuit of claim 1, wherein the first controllable element is a first metal-oxide semiconductor field effect transistor;
wherein a drain of the first metal-oxide semiconductor field effect transistor is connected to a second end of the load circuit as a first end of the first controllable element, and a source of the first metal-oxide semiconductor field effect transistor is grounded as a second end of the first controllable element; the grid electrode of the first metal-oxide semiconductor field effect transistor is used as the third end of the first controllable element, and is connected with the first end of the control circuit in parallel to the second end of the power supply conversion circuit.
4. The discharge circuit of claim 3, wherein the first metal-oxide semiconductor field effect transistor is an N-type metal-oxide semiconductor field effect transistor.
5. The discharge circuit of claim 1, wherein the control circuit comprises: a second controllable element;
the first end of the second controllable element and the third end of the first controllable element are used for being connected to the second end of the power conversion circuit in parallel, and the second end of the second controllable element is grounded; and if the second controllable element receives a low-level control signal, the second controllable element is turned off.
6. The discharge circuit of claim 5, further comprising a second current limiting element; the control circuit further includes: a first current limiting element;
the first end of the first current limiting element is connected with the third end of the second controllable element, the first end of the second controllable element is connected with the first end of the second current limiting element and the third end of the first controllable element, and the second end of the second current limiting element is used for being connected with the second end of the power conversion circuit.
7. The discharge circuit of claim 6, wherein the control circuit further comprises: a first capacitive element and a third resistive element;
the first end of the first capacitor element is connected with the second end of the first current limiting element, the first end of the third resistor element and the third end of the second controllable element; a second end of the first capacitive element is grounded; a second end of the third resistive element is grounded.
8. The discharge circuit of claim 5, wherein the second controllable element is a second metal-oxide semiconductor field effect transistor;
the drain of the second metal-oxide semiconductor field effect transistor is used as the first end of the second controllable element, and the drain and the third end of the first controllable element are used for being connected to the second end of the power conversion circuit in parallel; and the source electrode of the second metal-oxide semiconductor field effect transistor is used as the second end of the second controllable element and is grounded.
9. The discharge circuit of claim 1, further comprising: the power supply conversion circuit; wherein, the first and the second end of the pipe are connected with each other,
if the power conversion circuit receives a low-level control signal, the power conversion circuit performs voltage reduction processing on the obtained commercial power signal to obtain a first power supply signal;
if the power conversion circuit receives a high-level control signal, the power conversion circuit performs voltage reduction processing on the obtained commercial power signal to obtain the first power supply signal and a second power supply signal which is used for being transmitted to the first end of the load circuit.
10. The discharging circuit according to any of claims 1-9, wherein when the control circuit receives a high-level control signal, the control circuit is turned on, so that the first power supply signal output by the power conversion circuit is grounded through the control circuit.
11. A motherboard, characterized in that the motherboard comprises a discharge circuit according to any of claims 1-10.
12. An electronic device, characterized in that the electronic device comprises a discharge circuit according to any of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220975209.XU CN217769849U (en) | 2022-04-21 | 2022-04-21 | Discharge circuit, mainboard and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220975209.XU CN217769849U (en) | 2022-04-21 | 2022-04-21 | Discharge circuit, mainboard and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769849U true CN217769849U (en) | 2022-11-08 |
Family
ID=83883478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220975209.XU Active CN217769849U (en) | 2022-04-21 | 2022-04-21 | Discharge circuit, mainboard and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769849U (en) |
-
2022
- 2022-04-21 CN CN202220975209.XU patent/CN217769849U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10528492B2 (en) | Circuit, method and apparatus for USB interface sharing | |
| WO2021051445A1 (en) | Ncsi network card power supply system | |
| US20230291307A1 (en) | Power supply system, soft-start circuit, and control method | |
| CN111090325B (en) | Hot standby power switching system based on storage system | |
| CN112671084A (en) | USB device and operation method thereof | |
| CN101593963A (en) | Overvoltage crowbar | |
| US20020015272A1 (en) | Switch device and overcurrent controlling method | |
| US10326446B2 (en) | Semiconductor apparatus including a power gating circuit and a repair method of the semiconductor apparatus | |
| EP3576344A1 (en) | Powered device used for power over ethernet | |
| CN217769849U (en) | Discharge circuit, mainboard and electronic equipment | |
| CN214375036U (en) | Mobile device test system | |
| CN107395530B (en) | Switching chip, network equipment and power consumption control method | |
| US20200144999A1 (en) | Hot swap controller with multiple current limits | |
| CN109509454B (en) | Driving device, circuit driving method and display panel | |
| US7701684B2 (en) | Power supply apparatus and power supply system including the same addressing abnormality | |
| GB2056198A (en) | Power supplies for printed circuit boards | |
| CN109586568B (en) | Drive circuit and display panel | |
| EP0948841A1 (en) | Method and apparatus for low power data transmission | |
| CN220154577U (en) | Semiconductor high-voltage test circuit and system | |
| US20190280587A1 (en) | Power supply circuit with surge-suppression | |
| CN215867834U (en) | M.2B KEY interface, computer mainboard and computer equipment | |
| CN211906032U (en) | Initialization control circuit and electronic equipment | |
| US20070043893A1 (en) | Bus communication apparatus and bus communication method | |
| CN218352218U (en) | Dynamic power limiting circuit and charging device | |
| CN220342096U (en) | Device for overcoming GPU skip load in cold redundancy mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |