CN111752365A - Linkage startup and shutdown method and circuit, first electronic equipment and second electronic equipment - Google Patents

Linkage startup and shutdown method and circuit, first electronic equipment and second electronic equipment Download PDF

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Publication number
CN111752365A
CN111752365A CN202010647603.6A CN202010647603A CN111752365A CN 111752365 A CN111752365 A CN 111752365A CN 202010647603 A CN202010647603 A CN 202010647603A CN 111752365 A CN111752365 A CN 111752365A
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circuit
electronic device
signal
resistor
diode
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CN202010647603.6A
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CN111752365B (en
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董旺飞
王刚
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Zhuhai Pantum Electronics Co Ltd
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Zhuhai Pantum Electronics Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/263—Arrangements for using multiple switchable power supplies, e.g. battery and AC
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/296—Time-programme switches providing a choice of time-intervals for executing more than one switching action and automatically terminating their operation after the programme is completed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00885—Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
    • H04N1/00888—Control thereof

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Sources (AREA)

Abstract

The embodiment of the invention provides a linkage startup and shutdown method, a linkage startup and shutdown circuit, first electronic equipment and second electronic equipment, wherein the linkage startup and shutdown circuit comprises: the device comprises a signal input port, a signal conversion circuit and a signal output port, wherein the signal conversion circuit comprises a charge-discharge circuit and a switch circuit; when the signal input port inputs a starting-up indication signal of the first electronic equipment to the charge-discharge circuit, the charge-discharge circuit is charged instantaneously, the switch circuit is conducted and outputs an instantaneous signal to the signal output port, so that the soft switch circuit of the second electronic equipment controls the second electronic equipment to start up after receiving the instantaneous signal; when the signal input port inputs a shutdown instruction signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port, and the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal. The linkage switching circuit is low in cost and easy to change.

Description

Linkage startup and shutdown method and circuit, first electronic equipment and second electronic equipment
Technical Field
The application relates to the technical field of switch control, in particular to a linkage startup and shutdown method, a linkage startup and shutdown circuit and electronic equipment.
Background
In a system composed of an image forming apparatus and a computer or a system of other multiple devices, a user needs to turn on or off the devices one by one, which generally increases the operation time of the user and reduces the user experience; meanwhile, a user is more accustomed to turning off the power supply of equipment close to the user, for example, the user is accustomed to turning off the power supply of a computer and forgetting to turn off the power supply of a printer, or the user is accustomed to turning off the power supply of the printer and forgetting to turn off the power supply of the computer, and the power supply is not turned off by another equipment for a long time, so that energy is wasted and.
In the prior art, a computer and peripheral linked switching circuit is provided, as shown in fig. 1, a relay J1 is used to control a peripheral commercial power supply, after the computer is powered on, the computer provides a +5V power supply to a peripheral USB port, the +5V power supply provides a power supply to a relay J1 and a triode Q1 ' through a diode D4 ', one path of the power supply is divided by resistors R1 ' and R2 ' and then is used as a control power supply of the triode Q1 ', because the divided voltage value is greater than 0.7V, a triode Q1 ' is in saturated conduction, a relay J1 is attracted, a peripheral is electrified (powered on), the 0.3V voltage drop of a diode D3 ' (germanium diode) is smaller than the 0.7V voltage drop of a diode D1 ' (silicon diode), the peripheral +5V power supply provides a power supply to the relay J1 and a triode Q1 ' through D3 ', at this time, D1 ' is cut off, so that the computer does not need to provide a continuous attraction power supply of; when the computer is shut down, the capacitor C1 'discharges through the resistors R1' and R2 ', the divided voltage values of the resistors R1' and R2 'gradually decrease, when the divided voltage value decreases to be below 0.7 threshold value, the triode Q1' is cut off, the relay J1 is released, and the peripheral equipment also achieves shutdown.
The computer and peripheral linked on-off circuit shown in fig. 1 has the following problems: on one hand, the cost of the relay is high; on the other hand, the on-off of the commercial power is directly controlled by the relay, some unstable factors can be caused by sudden power failure, the system can be abnormally started after the power is on, and the forced power failure can also cause the damage of peripheral equipment (such as a hard disk) or reduce the service life of the peripheral equipment; finally, because the relay needs to be connected in series into the peripheral circuit, if the linked on-off function is added to the existing equipment, the circuit needs to be changed greatly, and the cost is high.
In the prior art, as shown in fig. 2, after it is detected that the master device and the slave device stop communicating for a period of time, a DC/DC (Direct Current/Direct Current chopper) module of the slave device turns off a signal, specifically, a GR signal of a USB Hub is detected to determine whether the master device and the slave device are in a communication state, and after the communication is stopped for a period of time, a microprocessor MCU (Microcontroller Unit) controls a DC/DC converter of the slave device to power off.
The master-slave device linkage shutdown circuit shown in fig. 2 has the following problems: an additional controller is required to continuously apply a signal to control the turn-off of the DC/DC converter, resulting in an increase in cost.
Therefore, based on the above, a linked power on/off scheme for reducing circuit cost is needed.
Disclosure of Invention
The embodiment of the application provides a linkage switching circuit, a first electronic device, a second electronic device, an image forming device and a linkage switching method, which can realize linkage switching control between the electronic devices, do not need to arrange an additional controller and a relay with higher cost, do not need to additionally arrange a power key, and have simple circuit structure and easy change.
In a first aspect, an embodiment of the present application provides a linked switch circuit, including a signal input port, a signal conversion circuit, and a signal output port, where the signal conversion circuit includes a charge-discharge circuit and a switch circuit;
the signal input port is electrically connected between first electronic equipment and the charging and discharging circuit and is used for inputting a starting indication signal or a shutdown indication signal of the first electronic equipment to the charging and discharging circuit, the switching circuit is electrically connected between the charging and discharging circuit and the signal output port, and the signal output port is electrically connected with a soft switching circuit of second electronic equipment;
when the signal input port inputs a starting-up indication signal of the first electronic equipment to the charge and discharge circuit, the charge and discharge circuit is charged instantaneously, the switch circuit is conducted and outputs an instantaneous signal to the signal output port, and the soft switch circuit of the second electronic equipment controls the second electronic equipment to start up after receiving the instantaneous signal;
when the signal input port inputs a shutdown indication signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port, and the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal.
With reference to the first aspect, in a possible implementation manner, the charge and discharge circuit includes a first capacitor and a second capacitor, where the first capacitor is used to realize instantaneous charging of the charge and discharge circuit, and the second capacitor is used to realize continuous discharging of the charge and discharge circuit.
With reference to the first aspect, in a possible implementation manner, the charge and discharge circuit further includes a first resistor, a second resistor, a third resistor, a first triode, a first diode, a second diode, a third diode, and a first capacitor, and the switch circuit includes a fourth resistor, a fifth resistor, and a second triode;
the signal input port is connected with the base electrode of the second triode sequentially through the first capacitor, the anode of the first diode, the cathode of the first diode and the fourth resistor; the signal input port is connected with the base electrode of the first triode through the first resistor; the signal input port is connected with the emitting electrode of the first triode sequentially through the anode and the cathode of the third diode, the collector of the first triode is connected between the cathode of the first diode and the fourth resistor sequentially through the anode and the cathode of the third diode, the cathode of the third diode is further connected between the emitter of the second triode and the ground through the fifth resistor, the signal input port is further grounded through the first capacitor and the second resistor in sequence, and the anode and the cathode of the second diode are connected between the emitter of the first triode and the anode of the second capacitor in sequence, the signal input port is further connected between the cathode of the second capacitor and the ground through the third resistor, and the collector of the second triode is connected with the signal output port.
With reference to the first aspect, in a possible implementation manner, the ganged switch circuit further includes a USB port, and the signal input port is configured to be connected to the USB port of the first electronic device through the USB port of the ganged switch circuit; or the linked power on/off circuit does not include a USB port, and the signal input port is connected with the USB port of the first electronic device through the USB port of the second electronic device; or, the linked on-off circuit does not include a USB port, and the signal input port is connected to the USB port of the first electronic device.
With reference to the first aspect, in a feasible implementation manner, the power-on indication signal is a power-on signal of a USB port of the first electronic device, and the power-off indication signal is a power-off signal of the USB port of the first electronic device.
In a second aspect, an embodiment of the present application provides a first electronic device, including the linked switching circuit described in the first aspect or any possible implementation manner of the first aspect, and configured to control, through the linked switching circuit, a power on and a power off of the second electronic device.
In a third aspect, an embodiment of the present application provides a second electronic device, including the linked power on/off circuit and the soft switching circuit described in the first aspect or any possible implementation manner of the first aspect, and configured to turn on and off under the control of the first electronic device through the linked power on/off circuit.
In a fourth aspect, an embodiment of the present application provides an image forming apparatus, including a first electronic device, a second electronic device, and a soft switching circuit in the first aspect or any possible implementation manner of the first aspect, where the soft switching circuit is disposed independently from the first electronic device and the second electronic device, or the soft switching circuit is disposed inside the first electronic device, or the soft switching circuit is disposed inside the second electronic device, where the first electronic device is a main control board of the image forming apparatus, and the second electronic device is a security control board of the image forming apparatus.
In a fifth aspect, an embodiment of the present application provides a method for linked power on and power off, where the linked power on and power off circuit includes: the linkage on-off method comprises the following steps:
when the signal input port inputs a starting-up indication signal of the first electronic equipment to the charge and discharge circuit, the charge and discharge circuit is charged instantaneously, the switch circuit is conducted and outputs an instantaneous signal to the signal output port, and the soft switch circuit of the second electronic equipment controls the second electronic equipment to start up after receiving the instantaneous signal;
when the signal input port inputs a shutdown indication signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port, and the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal.
With reference to the fifth aspect, in a possible implementation manner, the charge and discharge circuit includes a first capacitor and a second capacitor, the first capacitor is used for realizing instantaneous charging of the charge and discharge circuit, and the second capacitor is used for realizing continuous discharging of the charge and discharge circuit.
With reference to the fifth aspect, in a possible implementation manner, the charge and discharge circuit includes a first resistor, a second resistor, a third resistor, a first triode, a first diode, a second diode, a third diode, a first capacitor, and a second capacitor, and the switch circuit includes a fourth resistor, a fifth resistor, and a second triode;
the signal input port is connected with the base electrode of the second triode sequentially through the first capacitor, the anode of the first diode, the cathode of the first diode and the fourth resistor; the signal input port is connected with the base electrode of the first triode through the first resistor; the signal input port is connected with the emitting electrode of the first triode sequentially through the anode and the cathode of the third diode, the collector of the first triode is connected between the cathode of the first diode and the fourth resistor sequentially through the anode and the cathode of the third diode, the cathode of the third diode is further connected between the emitter of the second triode and the ground through the fifth resistor, the signal input port is further grounded through the first capacitor and the second resistor in sequence, and the anode and the cathode of the second diode are connected between the emitter of the first triode and the anode of the second capacitor in sequence, the signal input port is further connected between the cathode of the second capacitor and the ground through the third resistor, and the collector of the second triode is connected with the signal output port.
With reference to the fifth aspect, in a possible implementation manner, the switch linkage circuit further includes a USB port, and the USB port of the switch linkage circuit is connected between the signal input port and the USB port of the first electronic device; or, the linked on-off circuit does not include a USB port, and the signal input port is connected to the USB port of the first electronic device through the USB port of the second electronic device.
With reference to the fifth aspect, in a feasible implementation manner, the power-on indication signal is a power-on signal of a USB port of the first electronic device, and the power-off indication signal is a power-off signal of the USB port of the first electronic device.
It can be understood that the embodiment of the invention realizes the linkage on-off control of the first electronic device and the second electronic device by arranging the linkage on-off circuit and the charge-discharge circuit and the switching circuit, does not need to arrange an additional controller and a relay with higher cost or an additional power key, and has simple circuit structure and easy modification.
Drawings
FIG. 1 is a circuit diagram of a computer and peripheral linked on/off circuit provided in the prior art;
fig. 2 is a block diagram illustrating a shutdown circuit for linkage between a master device and a slave device in the prior art;
FIG. 3 is a block diagram of a linked power on/off system according to an embodiment of the present invention;
fig. 4 is a block diagram of a linked powering on and off system according to yet another embodiment of the present invention;
fig. 5 is a block diagram of a linked powering on and off system according to yet another embodiment of the present invention;
fig. 6 is a block diagram of a linked powering on and off system according to yet another embodiment of the present invention;
fig. 7 is a block diagram of a linked powering on and off system according to yet another embodiment of the present invention;
fig. 8 is a block diagram of a linked powering on and off system according to yet another embodiment of the present invention;
fig. 9 is a block diagram of a linked powering on and off system according to yet another embodiment of the present invention;
FIG. 10 is a circuit diagram of a ganged switch circuit and soft switch circuit of one embodiment of the present invention;
fig. 11 is a flowchart of a linked powering on and powering off method according to an embodiment of the present invention.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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.
In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
Fig. 3 to 8 are block diagrams of the linked power on/off system according to an embodiment of the present invention.
As shown in fig. 3, a linked power on/off system includes a first electronic device, a second electronic device and a linked power on/off circuit, wherein in the embodiment shown in fig. 3, the first electronic device and the second electronic device are independent of each other, the linked power on/off circuit is disposed inside the second electronic device, the linked power on/off circuit is electrically connected between a USB (Universal Serial Bus) port of the second electronic device and a soft switching circuit of the second electronic device, and the USB port of the second electronic device is electrically connected to the USB port of the first electronic device through a USB connection line.
In another embodiment of the present invention, as shown in fig. 4, the switch linkage circuit may further include a USB port, and the USB port of the switch linkage circuit is electrically connected to the USB port of the first electronic device through a USB connection line.
In another embodiment of the present invention, as shown in fig. 5, the linked switch circuit may be further disposed independently with respect to the first electronic device and the second electronic device, the linked switch circuit includes a USB port, the USB port of the linked switch circuit is electrically connected to the USB port of the first electronic device through a USB connection line, and the linked switch circuit is electrically connected to the soft switch circuit of the second electronic device.
In other embodiments of the present invention, as shown in fig. 6, a first electronic device and a second electronic device may be both packaged in the body of the image forming apparatus, wherein the first electronic device is the main control board of the image forming apparatus, the second electronic device is the security control board of the image forming apparatus, the interlock switching circuit may be disposed inside the first electronic device or the second electronic device, or may be disposed independently from the first electronic device and the second electronic device, fig. 6 shows an example in which the interlock switching circuit is disposed independently from the first electronic device and the second electronic device, and may be applied to a place with higher security requirements, such as a government agency, to prevent the image forming apparatus from stealing information of the user computer, since both the main control board (the first electronic device) and the security control board (the second electronic device) of the image forming apparatus are off-the shelf, the method can be realized only by adding a linkage switching circuit independently, and has the advantages of small change and low research and development cost.
In other embodiments of the present invention, as shown in fig. 7, the linked on/off circuit is disposed inside the first electronic device, the linked on/off circuit includes a USB port, the linked on/off circuit is electrically connected to the USB port of the first electronic device through the USB port, and the linked on/off circuit of the first electronic device is electrically connected to the soft on/off circuit of the second electronic device;
in another embodiment of the present invention, as shown in fig. 8, the linked on/off circuit is disposed inside the first electronic device, the linked on/off circuit does not include a USB port, the linked on/off circuit is electrically connected to the USB port of the first electronic device, and the linked on/off circuit of the first electronic device is electrically connected to the soft switch circuit of the second electronic device.
Of course, the structure of the linked on/off system may have other implementation manners, which are not listed here.
Among them, the USB port has a wide range of applications, is a common interface for various electronic devices, and is generally used for data transmission. The USB interface has 4 lines in total, two power lines (VCC and GND) and two signal lines (D + and D-). In a state where the device normally operates, a voltage of 5V may be detected at a power signal positive electrode (VCC, hereinafter Vbus) of the USB; when the first electronic device is in a power-off state, the voltage of the first electronic device is 0, so that the voltage of the positive pole of the power signal of the USB port can be directly detected to judge the power-on/off state of the first electronic device. In other embodiments, other communication interfaces, such as an RS232 interface, an RS485 interface, etc., may be substituted, and a wireless interface, etc., may also be used.
The first electronic device can realize linked on-off control of the second electronic device, that is, when the first electronic device is turned off, the second electronic device can be controlled to be turned off, and when the first electronic device is turned on, the second electronic device can be controlled to be turned on.
As an example, the first electronic device may be a computer, the second electronic device may be an image forming apparatus for executing an image forming job such as generating, printing, receiving, and transmitting image data, and examples of the image forming apparatus include a printer, a scanner, a copier, a facsimile machine, and a Multi-Functional Peripheral (MFP) that performs the above functions in a single device; when the computer is used as an auxiliary device, for example, only data security of the image forming apparatus is managed, the first electronic device may also be the image forming apparatus, and the second electronic device may also be the computer. As another example, the first electronic device and the second electronic device may be both terminal devices such as a computer, or the first electronic device and the second electronic device may be both image forming apparatuses, or the first electronic device and the second electronic device may also be other electronic devices, which is not limited in this respect.
As shown in fig. 9, the linked switching circuit in the embodiment of the present invention may include: the signal conversion circuit comprises a charge-discharge circuit and a switch circuit.
In some embodiments of the present invention, the linked on/off circuit further includes a USB port, and the signal input port is used for connecting to the USB port of the first electronic device through the USB port of the linked on/off circuit; or the linkage on-off circuit does not comprise a USB port, and the signal input port is connected with the USB port of the first electronic equipment through the USB port of the second electronic equipment; or, the linked on-off circuit does not include a USB port, and the signal input port is connected to the USB port of the first electronic device.
In some embodiments of the present invention, the signal input port Vbus obtains a power-on indication signal or a power-off indication signal of the first electronic device through the USB port of the second electronic device, and is configured to input the power-on indication signal or the power-off indication signal of the first electronic device to the charge and discharge circuit, the switch circuit is electrically connected between the charge and discharge circuit and the signal output port PWR, and the signal output port PWR is electrically connected to the soft switch circuit of the second electronic device;
the power-on indication signal is a power-on signal of the USB port of the first electronic device, and the power-off indication signal is a power-off signal of the USB port of the first electronic device.
When the signal input port Vbus inputs a starting indication signal of the first electronic equipment to the charging and discharging circuit, the charging and discharging circuit is charged instantaneously, the switching circuit is conducted and outputs an instantaneous signal to the signal output port PWR, and the soft switching circuit of the second electronic equipment controls the second electronic equipment to be started after receiving the instantaneous signal;
when the signal input port Vbus inputs a shutdown instruction signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port PWR, and the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal.
It can be understood that the embodiment of the invention realizes the linkage on-off control of the first electronic device and the second electronic device by arranging the linkage on-off circuit and the charge-discharge circuit and the switching circuit, does not need to arrange an additional controller and a relay with higher cost or an additional power key, and has simple circuit structure and easy modification.
The linked switch circuit may or may not include a USB interface, and the linked switch circuit may be disposed inside the first electronic device, may also be disposed inside the second electronic device, or may be disposed independently from the first electronic device and the second electronic device, which has been described in detail above and will not be described again here.
As shown in fig. 10, in one specific implementation, the charging and discharging circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, a first diode D1, a second diode D2, a third diode D3, a first capacitor C1, and a second capacitor EC1, and the switching circuit includes a fourth resistor R4, a fifth resistor R5, and a second transistor Q2;
the signal input port is connected with the base electrode of the second triode Q2 sequentially through a first capacitor C1, the anode of a first diode R1, the cathode of a first diode D1 and a fourth resistor R4; the signal input port Vbus is connected with the base of a first triode Q1 through a first resistor R1; the signal input port Vbus is connected to the emitter of the first transistor Q1 sequentially through the anode and the cathode of the third diode D3, the collector of the first transistor Q1 is connected between the cathode of the first diode D1 and the fourth resistor R4 sequentially through the anode and the cathode of the third diode D3, the cathode of the third diode D3 is connected between the emitter of the second transistor Q2 and the ground GND sequentially through the fifth resistor R5, the signal input port is connected to the ground GND sequentially through the first capacitor C1 and the second resistor R2, the anode and the cathode of the second diode D2 sequentially are connected between the emitter of the first transistor Q1 and the anode of the second capacitor EC1, the signal input port Vbus is connected between the cathode of the second capacitor EC1 and the ground GND sequentially through the third resistor R3, and the collector of the second transistor Q2 is connected to the signal output port.
The first capacitor C1 is used for realizing the instant charging of the charging and discharging circuit, and the second capacitor EC1 is used for realizing the continuous discharging of the charging and discharging circuit.
In the embodiment of the present invention, the first transistor Q1 may be a PNP transistor, and the second transistor Q2 may be an NPN transistor.
When the pull-down time of the signal output port PWR is less than or equal to a first preset time period (when the power-on time sequence requirement of the second electronic device is met), the signal output by the signal output port PWR is an instantaneous signal, and when the pull-down time of the signal output port PWR is greater than or equal to a second preset time period (when the power-off time sequence requirement of the second electronic device is met), the signal output by the signal output port PWR is a continuous signal.
The power-on indication signal may be a high level signal, and the power-off indication signal may be a low level signal.
In the embodiment of the present invention, the DC soft switching circuit implements on/off control by a low level trigger mode. The DC soft switch circuit of the second electronic device controls the second electronic device to start up after receiving the instantaneous trigger signal, and locks the start-up state to prevent false triggering. When a continuous low-level continuous trigger signal is input, the DC soft switching circuit of the second electronic equipment controls the second electronic equipment to shut down after receiving the continuous trigger signal, and simultaneously clears the state to wait for the next startup trigger.
As shown in fig. 10, as an example, the soft switching circuit may specifically include: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth diode D4, a fifth diode D5, a third Transistor Q3, and a first MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, abbreviated as mosfet) Transistor Q4.
The signal output port PWR is electrically connected between the cathode of the fourth diode D4 and the cathode of the fifth diode D5, the anode of the fourth diode D4 is electrically connected to the power source VCC through the sixth resistor R6, the anode of the fifth diode D5 is electrically connected between the gate of the first MOS transistor Q4 and the collector of the third transistor Q3, and the anode of the fifth diode D5 is also electrically connected between the power source VCC and the drain of the first MOS transistor Q4 through the ninth resistor R9; the base of the third transistor Q3 is electrically connected to the POWER input terminal POWER IN through a seventh resistor R7, and the base of the third transistor Q3 is also electrically connected between the emitter of the third transistor Q3 and ground GND through an eighth resistor R8. The third transistor Q3 is an NPN transistor, and the first MOS transistor Q4 is a P-channel MOS transistor.
The following is a description of the implementation principle of the embodiment of the present invention.
As shown in fig. 10, the signal input port Vbus inputs a voltage of the USB port of the first electronic device, and when the first electronic device is powered on, the signal input port Vbus inputs a high-level signal (power-on instruction signal), and when the first electronic device is powered off, the signal input port Vbus inputs a low-level signal (power-off instruction signal); the signal output port PWR is used for outputting a power on/off control signal PWR signal for controlling the second electronic device, and is a high level signal by default.
The implementation principle of the startup synchronization is as follows: when the first electronic device is powered on, that is, the signal output port Vbus is powered on, a high level signal is output, the first capacitor C1 is charged, and a current flows from the first diode D1 to the fourth resistor R4, so that the second transistor Q2 is turned on at the moment of powering on, the power on/off control signal PWR is pulled down instantaneously until the first capacitor C1 is charged to the end, and the power on/off control signal PWR is pulled down at the moment of powering on the second electronic device. Meanwhile, after the first capacitor C1 is charged, the second triode Q2 is not turned on, and the signal output port PWR recovers to the original high level state.
The shutdown synchronization implementation principle comprises the following steps: when the first electronic device is powered off, that is, when the signal output port Vbus is powered off, a low level signal is output, since the second capacitor EC1 discharges slowly, the first triode Q1 is turned on, and a current flows from the third diode D3 to the fifth resistor R5, when the first electronic device is powered off, the second triode Q2 is turned on, and the power on/off control signal PWR is pulled down instantaneously, wherein the on-time of the first triode Q1 and the on-time of the second triode Q2 depend on the discharge time of the second capacitor EC1, during the discharge of the second capacitor EC1, the power on/off control signal PWR is pulled down continuously, and when the power on/off control signal PWR is pulled down for a time period that meets the power off timing requirement of the second electronic device, the second electronic device is powered off. After the second capacitor EC1 finishes discharging, the first triode Q1 and the second triode Q2 are cut off, and the signal output port PWR recovers to the original high level state.
It can be understood that the embodiment of the invention realizes the linkage on-off control of the first electronic device and the second electronic device by arranging the linkage on-off circuit and the charge-discharge circuit and the switching circuit, does not need to arrange an additional controller and a relay with higher cost or an additional power key, and has simple circuit structure and easy modification.
An embodiment of the present invention further provides an electronic device, for example, the first electronic device in the foregoing, where the first electronic device includes the linked power on/off circuit in any one of the foregoing embodiments, and the first electronic device is configured to control the second electronic device to power on and off through the linked power on/off circuit.
An embodiment of the present invention further provides an electronic device, for example, the second electronic device in the foregoing, where the second electronic device includes the linked power on/off circuit and the soft switching circuit in any of the foregoing embodiments, and is configured to turn on and off under the control of the first electronic device through the linked power on/off circuit.
An embodiment of the present invention further provides an image forming apparatus, including a first electronic device, a second electronic device, and the soft switching circuit in any of the above embodiments, where the soft switching circuit is disposed independently from the first electronic device and the second electronic device, or the soft switching circuit is disposed inside the first electronic device, or the soft switching circuit is disposed inside the second electronic device, where the first electronic device is a main control board of the image forming apparatus, and the second electronic device is a security control board of the image forming apparatus.
The embodiment of the invention also provides a linkage startup and shutdown method, which is applied to the linkage startup and shutdown circuit/the first electronic equipment/the second electronic equipment, wherein the linkage startup and shutdown circuit comprises: the device comprises a signal input port, a signal conversion circuit and a signal output port, wherein the signal conversion circuit comprises a charge-discharge circuit and a switch circuit; the signal input port is electrically connected between the first electronic equipment and the charging and discharging circuit and used for inputting a starting indication signal or a shutdown indication signal of the first electronic equipment to the charging and discharging circuit, the switching circuit is electrically connected between the charging and discharging circuit and the signal output port, and the signal output port is electrically connected with the soft switching circuit of the second electronic equipment;
referring to fig. 11, the linked power on/off method includes:
step S01, when the signal input port inputs the start-up indication signal of the first electronic device to the charge-discharge circuit, the charge-discharge circuit is charged instantaneously, the switch circuit is conducted and outputs the instantaneous signal to the signal output port, so that the soft switch circuit of the second electronic device controls the second electronic device to start up after receiving the instantaneous signal;
and step S02, when the signal input port inputs the shutdown instruction signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port, so that the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal.
As shown in fig. 10, in a possible embodiment, the charging and discharging circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, a first diode D1, a second diode D2, a third diode D3, a first capacitor C1, and a second capacitor EC1, and the switching circuit includes a fourth resistor R4, a fifth resistor R5, and a second transistor Q2;
the signal input port is connected with the base electrode of the second triode Q2 sequentially through a first capacitor C1, the anode of a first diode R1, the cathode of a first diode D1 and a fourth resistor R4; the signal input port Vbus is connected with the base of a first triode Q1 through a first resistor R1; the signal input port Vbus is connected to the emitter of the first transistor Q1 sequentially through the anode and the cathode of the third diode D3, the collector of the first transistor Q1 is connected between the cathode of the first diode D1 and the fourth resistor R4 sequentially through the anode and the cathode of the third diode D3, the cathode of the third diode D3 is connected between the emitter of the second transistor Q2 and the ground GND sequentially through the fifth resistor R5, the signal input port is connected to the ground GND sequentially through the first capacitor C1 and the second resistor R2, the anode and the cathode of the second diode D2 sequentially are connected between the emitter of the first transistor Q1 and the anode of the second capacitor EC1, the signal input port Vbus is connected between the cathode of the second capacitor EC1 and the ground GND sequentially through the third resistor R3, and the collector of the second transistor Q2 is connected to the signal output port.
The first capacitor C1 is used for realizing the instant charging of the charging and discharging circuit, and the second capacitor EC1 is used for realizing the continuous discharging of the charging and discharging circuit.
In the embodiment of the present invention, the first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor.
When the pull-down time of the signal output port PWR is less than or equal to a first preset time period (when the power-on time sequence requirement of the second electronic device is met), the signal output by the signal output port PWR is an instantaneous signal, and when the pull-down time of the signal output port PWR is greater than or equal to a second preset time period (when the power-off time sequence requirement of the second electronic device is met), the signal output by the signal output port PWR is a continuous signal.
The power-on indication signal is a high level signal, and the power-off indication signal is a low level signal.
In the embodiment of the present invention, the DC soft switching circuit implements on/off control by a low level trigger mode. The DC soft switch circuit of the second electronic device controls the second electronic device to start up after receiving the instantaneous trigger signal, and locks the start-up state to prevent false triggering. When a continuous low-level continuous trigger signal is input, the DC soft switching circuit of the second electronic equipment controls the second electronic equipment to shut down after receiving the continuous trigger signal, and simultaneously clears the state to wait for the next startup trigger.
As shown in fig. 10, as an example, the soft switching circuit may specifically include: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth diode D4, a fifth diode D5, a third Transistor Q3, and a first MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, abbreviated as mosfet) Transistor Q4.
The signal output port PWR is electrically connected between the cathode of the fourth diode D4 and the cathode of the fifth diode D5, the anode of the fourth diode D4 is electrically connected to the power source VCC through the sixth resistor R6, the anode of the fifth diode D5 is electrically connected between the gate of the first MOS transistor Q4 and the collector of the third transistor Q3, and the anode of the fifth diode D5 is also electrically connected between the power source VCC and the drain of the first MOS transistor Q4 through the ninth resistor R9; the base of the third transistor Q3 is electrically connected to the POWER input terminal POWER IN through a seventh resistor R7, and the base of the third transistor Q3 is also electrically connected between the emitter of the third transistor Q3 and ground GND through an eighth resistor R8. The third transistor Q3 is an NPN transistor, and the first MOS transistor Q4 is a P-channel MOS transistor.
In a possible embodiment, the linked on/off circuit further includes a USB port, and the USB port of the linked on/off circuit is connected between the signal input port and the USB port of the first electronic device; or, the linked on-off circuit does not include a USB port, and the signal input port is connected to the USB port of the first electronic device through the USB port of the second electronic device.
The present application further provides a computer storage medium, which includes computer instructions, and when the computer instructions are executed on the first electronic device, the second electronic device, or the linked switching circuit, the first electronic device, the second electronic device, or the linked switching circuit executes the steps in the linked switching method.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working processes and principles of the first electronic device, the second electronic device and the linked powering on and powering off method described above may refer to corresponding contents in the foregoing linked powering on and powering off circuit embodiment, and are not described herein again.
The above embodiments are only specific embodiments of the present application, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. A linked switching circuit, characterized in that it comprises: the device comprises a signal input port, a signal conversion circuit and a signal output port, wherein the signal conversion circuit comprises a charge-discharge circuit and a switch circuit;
the signal input port is electrically connected between first electronic equipment and the charging and discharging circuit and is used for inputting a starting indication signal or a shutdown indication signal of the first electronic equipment to the charging and discharging circuit, the switching circuit is electrically connected between the charging and discharging circuit and the signal output port, and the signal output port is electrically connected with a soft switching circuit of second electronic equipment;
when the signal input port inputs a starting-up indication signal of the first electronic equipment to the charge and discharge circuit, the charge and discharge circuit is charged instantaneously, the switch circuit is conducted and outputs an instantaneous signal to the signal output port, and the soft switch circuit of the second electronic equipment controls the second electronic equipment to start up after receiving the instantaneous signal;
when the signal input port inputs a shutdown indication signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port, and the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal.
2. The linked switch circuit of claim 1, wherein the charge and discharge circuit comprises a first capacitor and a second capacitor, the first capacitor is configured to enable instantaneous charging of the charge and discharge circuit, and the second capacitor is configured to enable continuous discharging of the charge and discharge circuit.
3. The linked switch circuit of claim 2, wherein the charge and discharge circuit further comprises a first resistor, a second resistor, a third resistor, a first transistor, a first diode, a second diode, and a third diode, and the switch circuit comprises a fourth resistor, a fifth resistor, and a second transistor;
the signal input port is connected with the base electrode of the second triode sequentially through the first capacitor, the anode of the first diode, the cathode of the first diode and the fourth resistor; the signal input port is connected with the base electrode of the first triode through the first resistor; the signal input port is connected with the emitting electrode of the first triode sequentially through the anode and the cathode of the third diode, the collector of the first triode is connected between the cathode of the first diode and the fourth resistor sequentially through the anode and the cathode of the third diode, the cathode of the third diode is further connected between the emitter of the second triode and the ground through the fifth resistor, the signal input port is further grounded through the first capacitor and the second resistor in sequence, and the anode and the cathode of the second diode are connected between the emitter of the first triode and the anode of the second capacitor in sequence, the signal input port is further connected between the cathode of the second capacitor and the ground through the third resistor, and the collector of the second triode is connected with the signal output port.
4. The switch circuit of any one of claims 1-3, wherein the switch circuit further comprises a USB port, the signal input port being configured to connect to the USB port of the first electronic device through the USB port of the switch circuit; or the linked power on/off circuit does not include a USB port, and the signal input port is connected with the USB port of the first electronic device through the USB port of the second electronic device; or, the linked on-off circuit does not include a USB port, and the signal input port is connected to the USB port of the first electronic device.
5. The linked switch circuit of claim 4, wherein the power-on indication signal is a power-on signal at the USB port of the first electronic device, and the power-off indication signal is a power-off signal at the USB port of the first electronic device.
6. A first electronic device, comprising the linked switch circuit of any one of claims 1-5, for controlling the second electronic device to turn on and off through the linked switch circuit.
7. A second electronic device, comprising the linked switching circuit according to any one of claims 1 to 5 and a soft switching circuit, for turning on and off under the control of the first electronic device through the linked switching circuit.
8. An image forming apparatus comprising a first electronic device, a second electronic device, and the soft switching circuit according to any one of claims 1 to 5, wherein the soft switching circuit is provided independently of the first electronic device and the second electronic device, or the soft switching circuit is provided inside the first electronic device, or the soft switching circuit is provided inside the second electronic device, wherein the first electronic device is a main control board of the image forming apparatus, and the second electronic device is a security control board of the image forming apparatus.
9. A linkage on-off method is characterized in that the linkage on-off circuit comprises: the linkage on-off method comprises the following steps:
when the signal input port inputs a starting-up indication signal of the first electronic equipment to the charge and discharge circuit, the charge and discharge circuit is charged instantaneously, the switch circuit is conducted and outputs an instantaneous signal to the signal output port, and the soft switch circuit of the second electronic equipment controls the second electronic equipment to start up after receiving the instantaneous signal;
when the signal input port inputs a shutdown indication signal of the first electronic device to the charge and discharge circuit, the charge and discharge circuit continuously discharges, the switch circuit is switched on and outputs a continuous signal to the signal output port, and the soft switch circuit of the second electronic device controls the second electronic device to shut down after receiving the continuous signal.
10. The linked on-off method as claimed in claim 9, wherein the charging and discharging circuit comprises a first capacitor and a second capacitor, the first capacitor is used for realizing the instant charging of the charging and discharging circuit, and the second capacitor is used for realizing the continuous discharging of the charging and discharging circuit.
11. The linked on-off method as claimed in claim 10, wherein the charging and discharging circuit comprises a first resistor, a second resistor, a third resistor, a first triode, a first diode, a second diode, a third diode, a first capacitor and a second capacitor, and the switching circuit comprises a fourth resistor, a fifth resistor and a second triode;
the signal input port is connected with the base electrode of the second triode sequentially through the first capacitor, the anode of the first diode, the cathode of the first diode and the fourth resistor; the signal input port is connected with the base electrode of the first triode through the first resistor; the signal input port is connected with the emitting electrode of the first triode sequentially through the anode and the cathode of the third diode, the collector of the first triode is connected between the cathode of the first diode and the fourth resistor sequentially through the anode and the cathode of the third diode, the cathode of the third diode is further connected between the emitter of the second triode and the ground through the fifth resistor, the signal input port is further grounded through the first capacitor and the second resistor in sequence, and the anode and the cathode of the second diode are connected between the emitter of the first triode and the anode of the second capacitor in sequence, the signal input port is further connected between the cathode of the second capacitor and the ground through the third resistor, and the collector of the second triode is connected with the signal output port.
12. The ganged switch method according to any one of claims 9 to 11, wherein the ganged switch circuit further comprises a USB port, the USB port of the ganged switch circuit being connected between the signal input port and the USB port of the first electronic device; or, the linked on-off circuit does not include a USB port, and the signal input port is connected to the USB port of the first electronic device through the USB port of the second electronic device.
13. The linked power on/off method according to claim 12, wherein the power on indication signal is a power on signal of a USB port of the first electronic device, and the power off indication signal is a power off signal of the USB port of the first electronic device.
CN202010647603.6A 2020-07-07 2020-07-07 Linkage switching method and circuit, first electronic equipment and second electronic equipment Active CN111752365B (en)

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