Automatic power-on circuit in case of incoming call

Abstract

The utility model discloses an automatic power-on circuit for an incoming call. The automatic power-on circuit comprises a power supply module, an LDO (Low Dropout Regulator) power circuit module, a CPU circuit module and a power key module, the power supply module supplies power to the CPU circuit module and the power button module through the LDO power circuit module. The power button module is connected with a first wake-up pin of the CPU circuit module. A second wake-up pin of the CPU circuit module is connected to an external power supply; a control pin of the CPU circuit module is connected with a power supply of the to-be-controlled equipment, whether the last power failure is normal is recorded through the CPU circuit module, and if the last power failure is abnormal, a high level is provided for the CPU circuit module based on the LDO power supply circuit module, so that the CPU circuit module controls a power supply enabling pin of the to-be-controlled equipment to be started, and the to-be-controlled equipment is started. The technical problems of large workload and low efficiency caused by the fact that the existing equipment needs to be manually started up again and the state before power failure is recovered when the equipment is powered on again due to sudden power failure or battery power exhaustion are solved.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a circuit for automatically starting a computer when a call comes in. Background Art

[0002] The power on / off circuit generally uses a discrete device power on / off circuit composed of transistors or MOS tubes, or a simple power on / off circuit composed of a D flip-flop. It has simple functions and lacks functions such as automatic startup after abnormal power failure.

[0003] Hospitals use a lot of medical equipment such as ventilators. If the hospital suddenly loses power and the battery is exhausted, when the power comes back on, it will be difficult to restart the ventilators one by one and restore them to the state before the power outage. Therefore, a power-on circuit is needed that can automatically start the ventilators after an abnormal power outage and restore them to the state before the power outage. Summary of the invention

[0004] The present application provides a circuit for automatically starting the device upon incoming call, which solves the technical problem that in the existing equipment, if a sudden power outage or battery exhaustion occurs, the device needs to be manually restarted and restored to the state before the power outage when a call comes back, resulting in a large workload and low efficiency.

[0005] In view of this, the first aspect of the present application provides a circuit for automatically starting the device upon an incoming call, the circuit comprising:

[0006] Power supply module, LDO power circuit module, CPU circuit module and power button module;

[0007] The power supply module supplies power to the CPU circuit module and the power button module respectively through the LDO power circuit module;

[0008] The power button module is connected to the first wake-up pin of the CPU circuit module;

[0009] The second wake-up pin of the CPU circuit module is connected to an external power supply;

[0010] The control pin of the CPU circuit module is connected to the power supply of the device to be controlled.

[0011] Optionally, the power supply module specifically includes:

[0012] A switching power supply, an external DC power supply, a first battery, a second battery, and a bus power supply VPWR;

[0013] The switching power supply, the external DC power supply, the first battery, and the second battery respectively supply power to the bus power VPWR.

[0014] Optionally, the LDO power supply circuit module specifically includes:

[0015] A first microprocessor U2, wherein pins 5 and 8 of the first microprocessor U2 are respectively connected to a bus power supply VPWR, and are respectively grounded through a first capacitor C11 and a second capacitor C12;

[0016] Pin 7 of the first microprocessor U2 is grounded via a third capacitor C14;

[0017] A fourth capacitor C13 and a series structure of a first resistor R22 and a second resistor R23 are directly connected in parallel between pin 1 and pin 2 of the first microprocessor U2;

[0018] Pin 2 of the first microprocessor U2 is connected in series with the third resistor R24, and then connected in parallel with pin 1 through the fifth capacitor C15 and the sixth capacitor C16;

[0019] Pins 3, 4 and 9 of the first microprocessor U2 are connected to ground.

[0020] Optionally, the CPU circuit module specifically includes:

[0021] A second microprocessor U1, a first wake-up pin of the second microprocessor U1 is connected to a power button K1 through a fourth resistor R11;

[0022] The second wake-up pin of the second microprocessor U1 is respectively connected to the D pole of the PMOS transistor Q1, the S pole of the first NMOS transistor Q2, the fifth resistor R5 and one end of the seventh capacitor C9;

[0023] The S pole of the PMOS tube Q1 is connected to +3V3C, and the G pole of the PMOS tube Q1 is connected to +3V3C through the sixth resistor R1;

[0024] The G pole of the PMOS tube Q1 is connected to the D pole of the first NMOS tube Q2;

[0025] The G electrode of the first NMOS transistor Q2 is connected to the other end of the seventh capacitor C9 and the other end of the seventh resistor R6 respectively;

[0026] The G electrode of the first NMOS transistor Q2 is connected to VADP through the eighth resistor R4.

[0027] Optionally, it also includes an indicator light circuit module;

[0028] The LDO power supply circuit module supplies power to the indicator light circuit module;

[0029] The CPU circuit module is connected to the indicator light circuit module.

[0030] Optionally, the indicator light circuit module specifically includes:

[0031] A first light emitting diode D3, the cathode of the first light emitting diode D3 is connected to +3V3C, and the anode of the first light emitting diode D3 is connected to the D pole of the second NMOS tube Q3 through a ninth resistor R14;

[0032] The G pole and the S pole of the second NMOS tube Q3 are connected via a tenth resistor R20;

[0033] The G pole of the second NMOS tube Q3 is connected to the 50 pin of the first microprocessor U2 through the eleventh resistor R18.

[0034] Optionally, the indicator light circuit module further includes:

[0035] A second light emitting diode D4, the cathode of the second light emitting diode D4 is connected to +3V3C, and the anode of the second light emitting diode D4 is connected to the D pole of the third NMOS tube Q4 through the twelfth resistor R15;

[0036] The G pole and the S pole of the third NMOS tube Q4 are connected via a thirteenth resistor R21;

[0037] The G pole of the third NMOS tube Q4 is connected to the 51 pin of the first microprocessor U2 through the fourteenth resistor R19.

[0038] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0039] In the present application, a circuit for automatically starting up a device upon an incoming call is provided, comprising a power supply module, an LDO power supply circuit module, a CPU circuit module and a power button module; the power supply module supplies power to the CPU circuit module and the power button module respectively through the LDO power supply circuit module; the power button module is connected to a first wake-up pin of the CPU circuit module; a second wake-up pin of the CPU circuit module is connected to an external power supply; a control pin of the CPU circuit module is connected to a power supply of a device to be controlled, and the CPU circuit module records whether the last power failure was normal. If not, a high level is provided to the CPU circuit module based on the LDO power supply circuit module, so that the CPU circuit module controls the power enable pin of the device to be controlled to start up, thereby solving the technical problem that in the existing device, if a sudden power failure or battery exhaustion occurs, the device needs to be manually restarted and restored to the state before the power failure when a call comes back, resulting in a large workload and low efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a circuit framework diagram of an automatic power-on circuit for an incoming call in an embodiment of the present application;

[0041] Figure 2 : is a circuit diagram of an LDO power supply circuit module in an embodiment of the present application;

[0042] Figure 3A circuit diagram of a CPU circuit module in an embodiment of the present application;

[0043] Figure 4 This is the first circuit diagram of the indicator light circuit module in the embodiment of the present application;

[0044] Figure 5 This is a second circuit diagram of the indicator light circuit module in the embodiment of the present application;

[0045] Wherein, the accompanying drawings are marked as follows:

[0046] 101. Power supply module; 102. LDO power supply circuit module; 103. CPU circuit module; 104. Power button module;

[0047] VPWR, bus power supply; U2, first microprocessor; U1, second microprocessor; K1, power button; Q1, PMOS tube; Q2, first NMOS tube; Q3, second NMOS tube; Q4, third NMOS tube; D3, first light-emitting diode; D4, second light-emitting diode;

[0048] C11, first capacitor; C12, second capacitor; C14, third capacitor; C13, fourth capacitor; C15, fifth capacitor; C16, sixth capacitor; C9, seventh capacitor;

[0049] R22, first resistor; R23, second resistor; R24, third resistor; R11, fourth resistor; R5, fifth resistor; R1, sixth resistor; R6, seventh resistor; R4, eighth resistor; R14, ninth resistor;

[0050] R20, the tenth resistor; R18, the eleventh resistor; R15, the twelfth resistor; R21, the thirteenth resistor; R19, the fourteenth resistor. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] The present application designs an automatic power-on circuit when a call comes in, which solves the technical problem that in the existing equipment, if a sudden power outage or battery exhaustion occurs, the equipment needs to be manually restarted and restored to the state before the power outage when a call comes in again, resulting in a large workload and low efficiency.

[0053] For easier understanding, see Figure 1 , Figure 1 FIG. 1 is a circuit diagram of an automatic power-on circuit for an incoming call in an embodiment of the present application. Figure 1 As shown, specifically:

[0054] Power supply module 101, LDO power circuit module 102, CPU circuit module 103 and power button module 104;

[0055] The power supply module 101 supplies power to the CPU circuit module 103 and the power button module 104 respectively through the LDO power circuit module 102;

[0056] The power button module 104 is connected to the first wake-up pin of the CPU circuit module 103;

[0057] The second wake-up pin of the CPU circuit module 103 is connected to an external power supply;

[0058] The control pin of the CPU circuit module 103 is connected to the power supply of the device to be controlled.

[0059] Furthermore, the power supply module 101 specifically includes:

[0060] A switching power supply, an external DC power supply, a first battery, a second battery, and a bus power supply VPWR;

[0061] The switching power supply, the external DC power supply, the first battery, and the second battery respectively supply power to the bus power VPWR.

[0062] Furthermore, if Figure 2 As shown, the LDO power circuit module 102 specifically includes:

[0063] A first microprocessor U2, wherein pins 5 and 8 of the first microprocessor U2 are respectively connected to a bus power supply VPWR, and are respectively grounded through a first capacitor C11 and a second capacitor C12;

[0064] Pin 7 of the first microprocessor U2 is grounded via a third capacitor C14;

[0065] A fourth capacitor C13 and a series structure of a first resistor R22 and a second resistor R23 are directly connected in parallel between pin 1 and pin 2 of the first microprocessor U2;

[0066] Pin 2 of the first microprocessor U2 is connected in series with the third resistor R24, and then connected in parallel with pin 1 through the fifth capacitor C15 and the sixth capacitor C16;

[0067] Pins 3, 4 and 9 of the first microprocessor U2 are connected to ground.

[0068] It should be noted that the LDO power supply circuit module 102 is as follows Figure 2As shown, the CPU circuit module 103 is powered to ensure that the battery current is small enough when only the battery is powered and the computer is turned off to avoid wasting battery power.

[0069] Furthermore, if Figure 3 As shown, the CPU circuit module specifically includes:

[0070] A second microprocessor U1, a first wake-up pin of the second microprocessor U1 is connected to a power button K1 through a fourth resistor R11;

[0071] The second wake-up pin of the second microprocessor U1 is respectively connected to the D pole of the PMOS transistor Q1, the S pole of the first NMOS transistor Q2, the fifth resistor R5 and one end of the seventh capacitor C9;

[0072] The S pole of the PMOS tube Q1 is connected to +3V3C, and the G pole of the PMOS tube Q1 is connected to +3V3C through the sixth resistor R1;

[0073] The G pole of the PMOS tube Q1 is connected to the D pole of the first NMOS tube Q2;

[0074] The G electrode of the first NMOS transistor Q2 is connected to the other end of the seventh capacitor C9 and the other end of the seventh resistor R6 respectively;

[0075] The G electrode of the first NMOS transistor Q2 is connected to VADP through the eighth resistor R4.

[0076] It should be noted that the power button K1 is connected to the first wake-up pin WKUP2 / PC13 of the second microprocessor U1, and the external power wake-up is connected to the second wake-up pin WKUP1 / PA0 of the second microprocessor U1. When the power button K1 is pressed, WKUP2 / PC13 changes from a low level of 0V to a high level of 3.3V. When an external power supply is connected, WKUP1 / PA0 changes from a low level of 0V to a high level of 3.3V. The low-power CPU communicates with the smart battery, reads information such as power, and the low-power CPU controls the power enable pin to turn on and off the machine.

[0077] Furthermore, it also includes an indicator light circuit module;

[0078] The LDO power circuit module supplies power to the indicator light circuit module;

[0079] The CPU circuit module is connected to the indicator light circuit module.

[0080] Furthermore, if Figure 4 As shown, the indicator light circuit module specifically includes:

[0081] A first light emitting diode D3, the cathode of the first light emitting diode D3 is connected to +3V3C, and the anode of the first light emitting diode D3 is connected to the D pole of the second NMOS tube Q3 through a ninth resistor R14;

[0082] The G pole and the S pole of the second NMOS tube Q3 are connected via a tenth resistor R20;

[0083] The G pole of the second NMOS tube Q3 is connected to the 50 pin of the first microprocessor U2 through the eleventh resistor R18.

[0084] Furthermore, if Figure 5 As shown, the indicator light circuit module also includes:

[0085] A second light emitting diode D4, the cathode of the second light emitting diode D4 is connected to +3V3C, and the anode of the second light emitting diode D4 is connected to the D pole of the third NMOS tube Q4 through the twelfth resistor R15;

[0086] The G pole and the S pole of the third NMOS tube Q4 are connected via a thirteenth resistor R21;

[0087] The G pole of the third NMOS tube Q4 is connected to the 51 pin of the first microprocessor U2 through the fourteenth resistor R19.

[0088] The working principle of the incoming call automatic power-on circuit of this application is:

[0089] Use the built-in flash or EEEPRM to save a variable to record whether the last shutdown was normal or abnormal, and then determine whether to automatically start up based on the state of this variable each time the program is initialized.

[0090] The specific process is that the CPU initializes and runs, first reading the variables to see whether the variables were "normal" or "abnormal" last time, and judging whether it needs to be automatically turned on based on the state of the variables. After each startup, the variables are initialized to "abnormal".

[0091] If the computer is turned off by pressing a button after startup or the battery is low and the computer is shut down automatically, change the variable to "normal" before shutting down the computer. Then the next time the CPU is initialized, it will read "normal".

[0092] If the machine is not shut down normally after startup, but suddenly loses power during operation, the variable will not change, or the initialized value will be "abnormal", then the next time the CPU is initialized, it will read "abnormal".

[0093] Then next time:

[0094] If the CPU initialization run reads "abnormal" last time, the CPU will enable all power supplies at a high level, automatically start up, and set the variable to "abnormal" after starting up.

[0095] If the CPU initialization run reads "normal" last time, the CPU will give a low level and will not automatically start up until the power button is detected to be pressed in the while loop or wake-up interrupt function. After starting up, the variable will be set to "abnormal".

[0096] After booting up, check whether it is a normal shutdown or an abnormal power outage. If it is a normal shutdown, change the variable to "normal" before shutting down. If it is an abnormal power outage, there is no time to modify the variable, and the variable will still be "abnormal".

[0097] The method for the upper computer to automatically restore the state before power failure is similar. After powering on, the current ventilation state is saved to the flash, and each modification is saved once. When there is an abnormal power failure, the previous saved state is read and restored after the next call to automatically start.

[0098] The power-on and power-off states and processes include:

[0099] 1. Automatically shutting down by pressing a button or automatically shutting down by software due to low battery is a normal power-off. Suddenly disconnecting all power supplies after starting up is an abnormal power-off. Disconnecting all power supplies after normal shutdown is a normal power-off.

[0100] 2. Power the CPU. In low-power Standby mode, the computer will restart after being woken up by a button or an external power source. It will detect whether the button is pressed to determine whether the computer is turned on.

[0101] 3. Power on and power off refers to whether the whole machine is turned on or off

[0102] Turn on the power, and enable the power supply 5V, 10V, 12V and other enable pins to a high level.

[0103] Shut down, power 5V, 10V, 12V and other enable pins to low level to shut down

[0104] 4. CPU wake-up processing:

[0105] When waking up, first check whether the last shutdown was normal.

[0106] If the last shutdown was abnormal, it will automatically restart.

[0107] If the last shutdown was normal, it will not automatically restart.

[0108] When waking up, check the power button status.

[0109] Check if the power button is pressed.

[0110] If there is a button pressed in the off state, you need to press the button to turn on the computer.

[0111] If not pressed, the device will not turn on.

[0112] 5. CPU shutdown processing:

[0113] Normal shutdown, power button shutdown and low battery software shutdown

[0114] Check the power supply status when shutting down.

[0115] If there is only battery, enter the shutdown low power mode Standby.

[0116] If there is still AC and DC power, enter shutdown Run mode.

[0117] In an embodiment of the present application, a circuit for automatically starting up upon an incoming call is provided, comprising a power supply module, an LDO power supply circuit module, a CPU circuit module and a power button module; the power supply module supplies power to the CPU circuit module and the power button module respectively through the LDO power supply circuit module; the power button module is connected to a first wake-up pin of the CPU circuit module; a second wake-up pin of the CPU circuit module is connected to an external power supply; a control pin of the CPU circuit module is connected to a power supply of a device to be controlled, and the CPU circuit module records whether the last power failure was normal. If not, a high level is provided to the CPU circuit module based on the LDO power supply circuit module, so that the CPU circuit module controls the power enable pin of the device to be controlled to start up, thereby solving the technical problem that in the existing device, if a sudden power failure or battery exhaustion occurs, the device needs to be manually restarted and restored to the state before the power failure when a call comes back, resulting in a large workload and low efficiency.

[0118] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A circuit for automatically starting the device when a call comes in, characterized in that: include: Power supply module, LDO power circuit module, CPU circuit module and power button module; The power supply module supplies power to the CPU circuit module and the power button module respectively through the LDO power circuit module; The power button module is connected to the first wake-up pin of the CPU circuit module; The second wake-up pin of the CPU circuit module is connected to an external power supply; The control pin of the CPU circuit module is connected to the power supply of the device to be controlled.

2. The circuit for automatically starting the device upon incoming call according to claim 1, characterized in that: The power supply module specifically includes: A switching power supply, an external DC power supply, a first battery, a second battery, and a bus power supply (VPWR); The switching power supply, the external DC power supply, the first battery, and the second battery respectively supply power to the bus power supply (VPWR).

3. The circuit for automatically starting the device when a call comes in according to claim 2, characterized in that: The LDO power supply circuit module specifically includes: A first microprocessor (U2), wherein pins 5 and 8 of the first microprocessor (U2) are respectively connected to a bus power supply (VPWR), and are respectively grounded through a first capacitor (C11) and a second capacitor (C12); Pin 7 of the first microprocessor (U2) is grounded via a third capacitor (C14); A fourth capacitor (C13) and a series structure of a first resistor (R22) and a second resistor (R23) are directly connected in parallel between pins 1 and 2 of the first microprocessor (U2); After the pin 2 of the first microprocessor (U2) is connected in series with the third resistor (R24), it is connected in parallel with the pin 1 through the fifth capacitor (C15) and the sixth capacitor (C16); Pins 3, 4 and 9 of the first microprocessor (U2) are connected to ground.

4. The circuit for automatically starting the device upon incoming call according to claim 3, characterized in that: The CPU circuit module specifically includes: A second microprocessor (U1), wherein a first wake-up pin of the second microprocessor (U1) is connected to a power button (K1) via a fourth resistor (R11); The second wake-up pin of the second microprocessor (U1) is respectively connected to the D pole of the PMOS tube (Q1), the S pole of the first NMOS tube (Q2), the fifth resistor (R5) and one end of the seventh capacitor (C9); The S pole of the PMOS tube (Q1) is connected to +3V3C, and the G pole of the PMOS tube (Q1) is connected to +3V3C through a sixth resistor (R1); The G pole of the PMOS tube (Q1) is connected to the D pole of the first NMOS tube (Q2); The G pole of the first NMOS tube (Q2) is respectively connected to the other end of the seventh capacitor (C9) and the other end of the seventh resistor (R6); The G pole of the first NMOS tube (Q2) is connected to VADP via an eighth resistor (R4).

5. The circuit for automatically starting the device upon incoming call according to claim 4, characterized in that: Also included is an indicator light circuit module; The LDO power supply circuit module supplies power to the indicator light circuit module; The CPU circuit module is connected to the indicator light circuit module.

6. The circuit for automatically starting the device upon incoming call according to claim 5, characterized in that: The indicator light circuit module specifically includes: A first light-emitting diode (D3), wherein a cathode of the first light-emitting diode (D3) is connected to +3V3C, and an anode of the first light-emitting diode (D3) is connected to a D electrode of a second NMOS tube (Q3) via a ninth resistor (R14); The G pole and the S pole of the second NMOS tube (Q3) are connected via a tenth resistor (R20); The G pole of the second NMOS tube (Q3) is connected to the 50 pin of the first microprocessor (U2) through the eleventh resistor (R18).

7. The circuit for automatically starting the device upon incoming call according to claim 6, characterized in that: The indicator light circuit module also includes: A second light emitting diode (D4), wherein the cathode of the second light emitting diode (D4) is connected to +3V3C, and the anode of the second light emitting diode (D4) is connected to the D pole of the third NMOS tube (Q4) through a twelfth resistor (R15); The G pole and the S pole of the third NMOS tube (Q4) are connected via a thirteenth resistor (R21); The G pole of the third NMOS tube (Q4) is connected to the 51 pin of the first microprocessor (U2) through the fourteenth resistor (R19).

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