阅读说明：本技术 一种主板虚拟开关电路及其工作方法 (Mainboard virtual switch circuit and working method thereof ) 是由 刘忠臣 何建伟 陈小兵 黎小兵 辛大勇 于 2019-12-02 设计创作，主要内容包括：本发明公开了一种主板虚拟开关电路及其工作方法,该种主板虚拟开关电路包括启动输入端、复位输入端、输出端、启动单元和复位单元；启动单元包括积分电路和放电接口,积分电路两端分别与启动输入端和放电接口相连,放电接口设置在积分电路与信号输出端之间；复位单元包括微分电路和放电电路,微分电路两端分别与复位输入端和放电电路相连；放电电路包括三极管Q1和接地极,放电电路通过三极管Q1基极与微分电路相连,放电电路通过三极管Q1的集电极与放电接口相连,三极管Q1发射极与接地极相连。本申请还公开了一种主板虚拟开关电路的工作方法。本申请的主板虚拟开关电路及其工作方法,具有较高的时效性、可靠性、经济性以及工作便利性。(The invention discloses a mainboard virtual switch circuit and a working method thereof, wherein the mainboard virtual switch circuit comprises a starting input end, a reset input end, an output end, a starting unit and a reset unit; the starting unit comprises an integrating circuit and a discharging interface, two ends of the integrating circuit are respectively connected with the starting input end and the discharging interface, and the discharging interface is arranged between the integrating circuit and the signal output end; the reset unit comprises a differential circuit and a discharge circuit, and two ends of the differential circuit are respectively connected with the reset input end and the discharge circuit; the discharging circuit comprises a triode Q1 and a grounding electrode, the discharging circuit is connected with the differentiating circuit through the base electrode of a triode Q1, the discharging circuit is connected with the discharging interface through the collector electrode of a triode Q1, and the emitter electrode of a triode Q1 is connected with the grounding electrode. The application also discloses a working method of the mainboard virtual switch circuit. The mainboard virtual switch circuit and the working method thereof have high timeliness, reliability, economy and working convenience.)

1. A mainboard virtual switch circuit is characterized by comprising a starting input end (100), a reset input end (200), a signal output end (300), a starting unit (400) and a reset unit (500);

the starting unit (400) comprises an integrating circuit (410) and a discharging interface (420), two ends of the integrating circuit (410) are respectively connected with the starting input end (100) and the discharging interface (420), and the discharging interface (420) is arranged between the integrating circuit (410) and the signal output end (300);

the reset unit (500) comprises a differential circuit (510) and a discharge circuit (520), wherein two ends of the differential circuit (510) are respectively connected with the reset input end (200) and the discharge circuit (520);

the discharging circuit (520) comprises a triode Q1 and a grounding electrode, the triode Q1 is provided with a base electrode, a collector electrode and an emitter electrode, the discharging circuit (520) is connected with the differential circuit (510) through the base electrode, the discharging circuit (520) is connected with the discharging interface (420) through the collector electrode, and the emitter electrode is connected with the grounding electrode.

2. The virtual switch circuit of claim 1, wherein a voltage dividing resistor R1 is further disposed between the differential circuit (510) and the discharge circuit (520), and the voltage dividing resistor R1 is disposed between the output terminal of the differential circuit (510) and the base of the transistor Q1.

3. The motherboard virtual switch circuit as recited in claim 1, characterized in that the differentiating circuit (510) comprises a capacitor C1 and a resistor R2 connected in series with each other; an output of the differentiating circuit (510) is disposed between the capacitor C1 and the resistor R2; the capacitor C1 is connected to the reset input (200) and the resistor R2 is connected to ground.

4. The virtual switch circuit of claim 3, wherein the capacitor C1 has a capacitance of 10uF, the resistor R2 has a resistance of 100K, and the transistor Q1 has a discharge time of more than 100 ms.

5. The motherboard virtual switch circuit of claim 4, wherein the transistor Q1 is of type MMBT3904LT 1.

6. The motherboard virtual switch circuit as recited in claim 1, characterized in that the integration circuit (410) comprises a resistor R3 and a capacitor C2 connected in series with each other; an output of the integrating circuit (410) is disposed between the resistor R3 and the capacitor C2; the resistor R3 is connected to the enable input (100) and the capacitor C2 is connected to ground.

7. The main board virtual switch circuit of claim 6, wherein the resistor R3 has a resistance value of 4.7K Ω, and the capacitor C2 has a capacitance value of 0.1 uF.

8. The operation method of the virtual switch circuit of the main board according to claim 1, wherein the method includes two operation states of normal start and reset start:

the normal start-up comprises the following steps:

1. inputting a voltage at a start input terminal (100) and outputting the voltage backward through an integrating circuit (410);

2. keeping the low level state of the reset input end (200), the base electrode of the triode Q1 is in the low level state, the triode Q1 is in the cut-off state, and the discharge interface (420) and the discharge circuit (520) are in the disconnected state;

3. the signal output end (300) obtains a high level state under the action of the integrating circuit (410) and outputs voltage to a subsequent element to enable the subsequent element to be powered to work;

the reset starting comprises the following steps:

1. after the circuit is normally started, namely the signal output end (300) is at a high level and outputs voltage, a reset signal is input to the reset input end (200);

2. after the reset signal is processed by the differential circuit (510), the output signal enables the discharge circuit (520) to enter a connected discharge state (the discharge circuit (520) works), the signal output end (300) is changed into a low level state, no voltage is output, and the follow-up element loses power and stops working;

3. after the triode Q1 lasts for the discharge time T, the triode Q1 is changed into a cut-off state again, the signal output end (300) recovers a high level state, and voltage is output again, so that subsequent elements are powered on again to work.

9. The operating method of the virtual switch circuit on the motherboard according to claim 8, wherein in the reset starting step 2, the specific step of the differentiating circuit (510) controlling the discharging circuit (520) is:

1. the reset signal generates pulse wave through a differential circuit (510) and is output;

2. the pulse wave is loaded to the base electrode of the triode Q1 through the divider resistor R1, and the base electrode of the triode Q1 becomes a high level state;

3. the emitter and the collector of the transistor Q1 are conducted, and the discharge interface (420) is communicated with the ground electrode through the transistor Q1 for discharging.

10. The operating method of the virtual switch circuit on the motherboard according to claim 8, wherein the reset starting step 3 is as follows,

d1, with the reduction of the pulse wave output voltage, after the discharge duration T of the triode Q1, the discharge voltage is smaller than the threshold voltage of the triode Q1, and the emitter and the collector of the triode Q1 are cut off;

d2, discharge interface (420) and earth electrode disconnection, signal output terminal (300) along with integrated circuit (410) pull up and resume high level state.

Technical Field

The invention relates to the technical field of mainboard switching circuits, in particular to a mainboard virtual switching circuit and a working method thereof.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

When the circuit main board is used, after the circuit main board is electrified, the main board is triggered to be started through a low pulse signal with the pulse width of dozens of milliseconds. In the prior art, a part of the main board realizes the triggering of the low-level pulse signal through a manual switch key, and for the main board needing to be automatically started, the low-level pulse signal is triggered by the programming of software such as an EC/MCU and the like and the addition of hardware collocation, so that the action of a virtual switch is realized, and the main board is started. However, the low-level pulse signal is triggered by a manual switch key, the problem of low timeliness of the mainboard starting mode is caused by the manual triggering mode, the low-level pulse signal is triggered by software programming and hardware matching, the use of software such as an EC/MCU is needed, more hardware matching is needed, a high level and a low level are input at the output end of the mainboard, the mainboard is powered on and the starting is triggered, and the problems of complicated working method steps and low economy of the circuit of the mainboard starting mode and the working method of the circuit are caused.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

The invention aims to solve the problems and provides a mainboard virtual switch circuit, which has the technical purposes that a high voltage is input at the reset input end through the start input end, the reset input end, the output end, the start unit and the reset unit, a low pulse signal is output at the output end after the high voltage is processed by the reset unit, and the opening and closing action of the virtual switch triggers the startup of a mainboard connected at the output end, so that the mainboard can be started up without externally connecting a low pulse signal, and the timeliness, reliability and economy of the mainboard virtual switch circuit are improved. The invention also provides a working method of the mainboard virtual switch circuit, which inputs high level at two ends of the integral circuit and the differential circuit, and outputs a low pulse signal at the output end through the state conversion of the triode to trigger the mainboard to start, thereby improving the step convenience and the economical efficiency of the working method of the mainboard virtual switch circuit.

In order to achieve the first technical object, the present invention provides a virtual switch circuit for a motherboard, which includes a start input terminal, a reset input terminal, a signal output terminal, a start unit and a reset unit; the starting unit comprises an integrating circuit and a discharging interface, two ends of the integrating circuit are respectively connected with the starting input end and the discharging interface, and the discharging interface is arranged between the integrating circuit and the signal output end; the reset unit comprises a differential circuit and a discharge circuit, and two ends of the differential circuit are respectively connected with the reset input end and the discharge circuit; the discharging circuit comprises a triode Q1 and a grounding electrode, the triode Q1 is provided with a base electrode, a collector electrode and an emitting electrode, the discharging circuit is connected with the differential circuit through the base electrode, the discharging circuit is connected with the discharging interface through the collector electrode, and the emitting electrode is connected with the grounding electrode.

Based on the above structure, the transistor Q1 is in a cut-off state when the voltage is just input to the start input terminal; when a high-level reset signal at the reset input end passes through the differential circuit, a pulse is generated, and after the pulse is loaded to the triode Q1, the triode Q1 is changed from a cut-off state to a conducting state; with the continuous loading of the pulse, the triode Q1 is changed from a conducting state to a cut-off state again, so that the signal output end outputs a low pulse signal, the opening and closing process of the switch is virtualized, and the mainboard connected with the signal output end is triggered to be started; after the high level is input at the starting input end, the mainboard is continuously electrified, and when the voltage value reaches the starting voltage, the high level signal at the reset input end is immediately input, so that a low pulse signal is generated at the discharge interface, the starting of the mainboard can be realized without using the low level signal, the timeliness of the virtual switch circuit of the mainboard is improved, the reliability of the virtual switch circuit of the mainboard is improved by pure hardware collocation without adopting software programming, the occupied space of the virtual switch circuit of the mainboard on the mainboard is reduced, and the use cost is reduced.

Preferably, a voltage dividing resistor R1 is further disposed between the differential circuit and the discharge circuit, and the voltage dividing resistor R1 is disposed between the output terminal of the differential circuit and the base of the transistor Q1.

Furthermore, the voltage dividing resistor R1 arranged at the base electrode of the triode Q1 can protect the triode Q1, prevent the problem that the mainboard cannot be started up due to burning-out of the triode Q1 caused by overlarge voltage, and improve the reliability of the virtual switch circuit of the mainboard.

Preferably, the differentiating circuit includes a capacitor C1 and a resistor R2 connected in series with each other; an output of the differentiating circuit is disposed between the capacitor C1 and the resistor R2; the capacitor C1 is connected to the reset input and the resistor R2 is connected to ground.

Furthermore, a differential circuit is formed by the capacitor C1 and the resistor R2, so that the structure of the differential circuit is simplified, and the occupied space of the virtual switch circuit on the mainboard is further reduced.

Preferably, the capacitance value of the capacitor C1 is 10uF, the resistance value of the resistor R2 is 100K, and the discharge time of the transistor Q1 is greater than 100 ms.

Furthermore, the duration of the low pulse signal at the signal output end can be adjusted by changing the parameters of the capacitor C1 and the resistor R2, so that the virtual switch circuit of the mainboard can be adapted to the mainboard with various parameters, and the economy of the virtual switch circuit of the mainboard is improved.

Preferably, the model of the triode Q1 is MMBT3904LT 1.

Preferably, the integration circuit includes a resistor R3 and a capacitor C2 connected in series with each other; the output of the integrating circuit is disposed between the resistor R3 and the capacitor C2; the resistor R3 is connected to the enable input and the capacitor C2 is connected to ground.

Preferably, the resistor R3 has a resistance value of 4.7K Ω, and the capacitor C2 has a capacitance value of 0.1 uF.

Based on the structural arrangement of the resistor R3 and the capacitor C2, the structure of the integrating circuit is simplified, the occupied space of the virtual switch circuit of the mainboard on the mainboard is further reduced, and the economy is improved.

In order to achieve the second technical object, the present invention further provides a method for operating a virtual switch circuit of a motherboard, wherein the method includes two operating states of normal start and reset start:

the normal start-up comprises the following steps:

1. inputting voltage at a starting input end and outputting the voltage backwards through an integrating circuit;

2. keeping the low level state of the reset input end, enabling the base electrode of the triode Q1 to be in the low level state, enabling the triode Q1 to be in the cut-off state, and enabling the discharging interface and the discharging circuit to be in the cut-off state;

3. the signal output end obtains a high level state under the action of the integrating circuit, and outputs voltage to a subsequent element to enable the subsequent element to be electrified and work;

the reset starting comprises the following steps:

1. after the circuit is normally started, namely the signal output end is at a high level and outputs voltage, a reset signal is input at the reset input end;

2. after the reset signal is processed by the differential circuit, the output signal enables the discharge circuit to enter a connected discharge state, the signal output end is changed into a low level state and does not output voltage any more, and the follow-up element loses power and stops working;

3. after the triode Q1 lasts for the discharge time T, the triode Q1 is changed into a cut-off state again, the signal output end recovers a high level state, and voltage is output again, so that subsequent elements are electrified again to work.

Preferably, in the reset starting step 2, the specific step of the differentiating circuit controlling the discharging circuit is:

1. the reset signal generates pulse wave through a differential circuit and is output;

2. the pulse wave is loaded to the base electrode of the triode Q1 through the divider resistor R1, and the base electrode of the triode Q1 becomes a high level state;

3. the emitter and the collector of the triode Q1 are conducted, and the discharging interface is communicated with the grounding electrode through the triode Q1 for discharging.

Preferably, the specific process of the reset starting step 3 is as follows,

d1, with the reduction of the pulse wave output voltage, after the discharge duration T of the triode Q1, the discharge voltage is smaller than the threshold voltage of the triode Q1, and the emitter and the collector of the triode Q1 are cut off;

d2, the interface that discharges and earthing pole disconnection, signal output end draws along with the integration circuit and resumes to the high level state.

Based on the working method of the virtual switch circuit of the mainboard, high-level signals are input at the starting input end and the resetting input end, the signal output end outputs a low-pulse signal through the conversion of the state of the triode Q1, the opening and closing action of the switch is simulated, and the mainboard is triggered to be started, so that the steps of the working method of the virtual switch circuit of the mainboard are simplified, and the step simplicity and the economical efficiency of the working method of the virtual switch circuit of the mainboard are improved.

In summary, according to the virtual switch circuit for a motherboard and the operating method thereof, based on the structural arrangement of the start input terminal, the reset input terminal, the signal output terminal, the start unit and the reset unit, the start input terminal and the reset input terminal sequentially input the high level signal, the differential circuit and the triode Q1 output a low pulse signal at the discharge interface, and the on-off action of the switch is virtualized, so that the motherboard connected to the signal output terminal is triggered to start up, the timeliness and the reliability of the virtual switch circuit for the motherboard and the operating method thereof are improved, and the convenience and the economy of the virtual switch circuit for the motherboard and the operating method thereof are improved by pure hardware matching without adopting software programming.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of a virtual switch circuit of a motherboard according to an embodiment of the present invention;

fig. 2 is a waveform diagram of an input voltage at a start input terminal, an input voltage at a reset input terminal, and a low pulse signal at a signal output terminal in operation of a virtual switch circuit of a motherboard according to an embodiment of the present invention;

reference numerals: 100-start input, 200-reset input, 300-signal output, 400-start unit, 410-integration circuit, 420-discharge interface, 500-reset unit, 510-differentiation circuit, 520-discharge circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.