Power switch control circuit and device and monitor

Abstract

The invention discloses a power switch control circuit and device and a monitor, and relates to the technical field of medical instruments.The power switch control circuit comprises a switch module, a switch detection module and a control module, and the switch module, the switch detection module and the control module are connected in sequence; the switch module is used for controlling a switch of the power switch control circuit; the switch detection module is used for detecting a key signal of the switch module and disconnecting a power supply after the switch module is continuously conducted for a preset time; and the control module is used for controlling startup. According to the technical scheme provided by the invention, the key signal of the switch module is detected by adopting the switch detection module, and the power supply is forcibly switched off after the switch module is continuously switched on for the preset time, so that the problem that the equipment cannot be switched off due to failure of a control mechanism of a power supply enable signal when the equipment crashes is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a power switch control circuit, a device and a monitor. Background Art

[0002] With the increasing popularity of electronic devices and the continuous advancement of technology, power management has become an important aspect of designing efficient and reliable electronic products.

[0003] At present, in many electronic devices, power switch control circuits are widely used to realize the startup and shutdown functions of the device. This circuit usually receives a power enable signal to decide whether to provide power to the system. Under normal working conditions, the power enable signal can effectively control the power supply, thereby realizing the management of the power consumption of the device.

[0004] However, the existing power switch control circuit has some shortcomings. In particular, when the device crashes, the control mechanism of the power enable signal fails, so even if the user wants to turn off the device, it cannot be realized, which brings inconvenience to the user. Therefore, how to effectively control the power enable signal when the device crashes has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The main purpose of the present invention is to provide a power switch control circuit, a power switch control device and a monitor, aiming to solve the technical problem of how to effectively control the power enable signal when the device crashes.

[0006] To achieve the above object, the present invention provides a power switch control circuit, which includes: a switch module, a switch detection module and a control module, wherein the switch module, the switch detection module and the control module are connected in sequence;

[0007] The switch module is used to control the switch of the power switch control circuit;

[0008] The switch detection module is used to detect the key signal of the switch module, and disconnect the power supply after the switch module is continuously turned on for a preset time;

[0009] The control module is used to control the startup.

[0010] In one embodiment, the power switch control circuit further includes: a filter module, the filter module is connected to the control module;

[0011] The filtering module is used to protect the circuit from noise interference.

[0012] In one embodiment, the switch module includes: a key switch;

[0013] A first end of the key switch is grounded, and a second end of the key switch is connected to the switch detection module.

[0014] In one embodiment, the switch module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a seventh resistor, a third capacitor, a first triode, a second triode, a first diode and a second diode;

[0015] A first end of the first resistor is connected to the input end, and a second end of the first resistor is connected to a first end of the third capacitor;

[0016] The first end of the second resistor is connected to the input end and the control module respectively, and the second end of the second resistor is connected to the other end of the control module;

[0017] A first end of the third resistor is connected to the input end, and a second end of the third resistor is connected to the emitter of the second transistor;

[0018] A first end of the fourth resistor is connected to the emitter of the second transistor, and a second end of the fourth resistor is connected to the second end of the key switch;

[0019] The first end of the seventh resistor is connected to the MCU voltage, and the second end of the seventh resistor is connected to the power switch button signal;

[0020] The first end of the third capacitor is connected to the second end of the first resistor, and the second end of the third capacitor is connected to the second end of the fourth resistor;

[0021] The base of the first transistor is connected to the collector of the second transistor, the emitter of the first transistor is connected to the input end, and the collector of the first transistor is connected to the second end of the second resistor;

[0022] The anode of the first diode is connected to the control module, and the cathode of the first diode is connected to the second end of the fourth resistor;

[0023] The anode of the second diode is connected to the power switch key signal, and the cathode of the second diode is connected to the cathode of the first diode.

[0024] In one embodiment, the control module includes: a MOS tube, a first capacitor, a second capacitor, a fifth resistor, a sixth resistor, an eighth resistor and a third transistor;

[0025] The gate of the MOS tube is connected to the second end of the second resistor, the source of the MOS tube is connected to the first end of the second resistor, and the drain of the MOS tube is connected to the output end;

[0026] The first end of the first capacitor and the first end of the second capacitor are both connected to the output end, and the second end of the first capacitor and the second end of the second capacitor are both grounded;

[0027] The first end of the fifth resistor is connected to the second end of the second resistor, and the second end of the fifth resistor is connected to the anode of the first diode;

[0028] A first end of the sixth resistor is connected to the base of the third transistor, and a second end of the sixth resistor is connected to a total power signal;

[0029] The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is grounded;

[0030] The emitter of the third transistor is grounded, and the collector of the third transistor is connected to the second end of the fifth resistor.

[0031] In one implementation, the filtering module includes: a fourth capacitor, a fifth capacitor, a sixth capacitor and a filtering unit;

[0032] The first end of the fourth capacitor is connected to the first end of the second capacitor;

[0033] The first end of the fifth capacitor and the first end of the sixth capacitor are connected to the output end of the filter unit and the MCU voltage;

[0034] The input end of the filter unit is connected to the output end;

[0035] The second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor and the grounding end of the filtering unit are all grounded.

[0036] In one embodiment, when the key switch is turned on, the second resistor, the fifth resistor, the first diode and the key switch form a loop, the MOS tube is turned on, the MCU is powered on, the third transistor is turned on, the second resistor, the fifth resistor and the third transistor form a loop, and when the key switch is turned off, the output end continues to output voltage.

[0037] In one embodiment, after the key switch is turned on for a preset time, the first resistor, the third capacitor and the key switch form a loop, the third capacitor is charged, the second transistor is turned on, the first transistor is turned on, the MOS transistor is turned off, and the host is shut down.

[0038] The present invention further provides a power switch control device, which includes the power switch control circuit as described above.

[0039] The present invention further provides a monitor, which includes the power switch control device as described above.

[0040] The technical solution of the present invention adopts a switch detection module to detect the key signal of the switch module, and forcibly disconnects the power supply after the switch module is continuously turned on for a preset time, thereby avoiding the problem that the control mechanism of the power enable signal fails when the device crashes, resulting in the device being unable to shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of an embodiment of a power switch control circuit provided by the present invention;

[0043] Figure 2 A circuit diagram of an embodiment of a power switch control circuit provided by the present invention.

[0044] Description of Figure Numbers:

[0045] R1 to R8, the first resistor to the eighth resistor; C1 to C6, the first capacitor to the sixth capacitor; Q1, the MOS tube; Q2 to Q4, the first transistor to the third transistor; D1 to D2, the first diode to the second diode; U1, the filtering unit.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] The invention provides a power switch control circuit.

[0051] See also Figure 1 , in one embodiment of the present invention, the power switch control circuit comprises: a switch module, a switch detection module and a control module, wherein the switch module, the switch detection module and the control module are connected in sequence;

[0052] The switch module is used to control the switch of the power switch control circuit;

[0053] The switch detection module is used to detect the key signal of the switch module, and disconnect the power supply after the switch module is continuously turned on for a preset time;

[0054] The control module is used to control the startup.

[0055] In this embodiment, the switch module can be a physical button or an electronic switch, and the user can start or stop the circuit by pressing or triggering the switch. If it is detected that the switch is in a continuous on state for more than a preset time threshold, it will trigger a power-off operation. This design is to prevent the device from being forced to disconnect the power supply even if the power enable signal fails in the event of a crash or other abnormal situation, ensuring that the device can be turned off. When the user presses the switch, the control module will receive the signal and start the device; in abnormal situations (such as a crash), since the switch detection module has disconnected the power supply, the control module will also enter a waiting state accordingly until the next valid start signal appears.

[0056] Specifically, in a feasible implementation, please refer to Figure 2 ,The switch module includes: a key switch;

[0057] A first end of the key switch is grounded, and a second end of the key switch is connected to the switch detection module.

[0058] In this embodiment, a first end of the key switch is grounded, and a second end of the key switch is connected to the switch detection module. The switch module may be a key switch used to control power on and power off of the device.

[0059] Specifically, in a feasible implementation manner, the switch module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a seventh resistor, a third capacitor, a first triode, a second triode, a first diode, and a second diode;

[0060] A first end of the first resistor is connected to the input end, and a second end of the first resistor is connected to a first end of the third capacitor;

[0061] The first end of the second resistor is connected to the input end and the control module respectively, and the second end of the second resistor is connected to the other end of the control module;

[0062] A first end of the third resistor is connected to the input end, and a second end of the third resistor is connected to the emitter of the second transistor;

[0063] A first end of the fourth resistor is connected to the emitter of the second transistor, and a second end of the fourth resistor is connected to the second end of the key switch;

[0064] The first end of the seventh resistor is connected to the MCU voltage, and the second end of the seventh resistor is connected to the power switch button signal;

[0065] The first end of the third capacitor is connected to the second end of the first resistor, and the second end of the third capacitor is connected to the second end of the fourth resistor;

[0066] The base of the first transistor is connected to the collector of the second transistor, the emitter of the first transistor is connected to the input end, and the collector of the first transistor is connected to the second end of the second resistor;

[0067] The anode of the first diode is connected to the control module, and the cathode of the first diode is connected to the second end of the fourth resistor;

[0068] The anode of the second diode is connected to the power switch key signal, and the cathode of the second diode is connected to the cathode of the first diode.

[0069] In this embodiment, the first end of the first resistor is connected to the input end, and the second end is connected to the first end of the third capacitor; the first end of the second resistor is respectively connected to the input end and the control module, and the second end is connected to the other end of the control module; the first end of the third resistor is connected to the input end, and the second end is connected to the emitter of the second transistor; the first end of the fourth resistor is connected to the emitter of the second transistor, and the second end is connected to the second end of the key switch; the first end of the seventh resistor is connected to the MCU voltage, and the second end is connected to the power switch key signal; the first end of the third capacitor is linked to the second end of the first resistor, and the second end is connected to the second end of the fourth resistor; the base of the first transistor is connected to the collector of the second transistor, the emitter is connected to the input end, and the collector is connected to the second end of the second resistor; the positive electrode of the first diode is connected to the control module, and the negative electrode is connected to the second end of the fourth resistor; the positive electrode of the second diode is connected to the power switch key signal, and the negative electrode is connected to the negative electrode of the first diode.

[0070] Specifically, in a feasible implementation manner, the control module includes: a MOS tube, a first capacitor, a second capacitor, a fifth resistor, a sixth resistor, an eighth resistor and a third triode;

[0071] The gate of the MOS tube is connected to the second end of the second resistor, the source of the MOS tube is connected to the first end of the second resistor, and the drain of the MOS tube is connected to the output end;

[0072] The first end of the first capacitor and the first end of the second capacitor are both connected to the output end, and the second end of the first capacitor and the second end of the second capacitor are both grounded;

[0073] The first end of the fifth resistor is connected to the second end of the second resistor, and the second end of the fifth resistor is connected to the anode of the first diode;

[0074] A first end of the sixth resistor is connected to the base of the third transistor, and a second end of the sixth resistor is connected to a total power signal;

[0075] The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is grounded;

[0076] The emitter of the third transistor is grounded, and the collector of the third transistor is connected to the second end of the fifth resistor.

[0077] In this embodiment, the gate of the MOS tube is connected to the second end of the second resistor, the source is connected to the first end of the second resistor, and the drain is connected to the output end; the first end of the first capacitor and the first end of the second capacitor are both connected to the output end, and the second end of the first capacitor and the second end of the second capacitor are both grounded; the first end of the fifth resistor is connected to the second end of the second resistor, and the second end is connected to the positive electrode of the first diode; the first end of the sixth resistor is connected to the base of the third transistor, and the second end is connected to the total power signal; the first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end is grounded; the emitter of the third transistor is grounded, and the collector is connected to the second end of the fifth resistor.

[0078] Specifically, in a feasible implementation manner, the power switch control circuit further includes: a filter module, the filter module is connected to the control module;

[0079] The filtering module is used to protect the circuit from noise interference.

[0080] In this embodiment, the filtering module can improve the signal quality and remove unnecessary noise or interference components.

[0081] Specifically, in a feasible implementation manner, the filtering module includes: a fourth capacitor, a fifth capacitor, a sixth capacitor and a filtering unit;

[0082] The first end of the fourth capacitor is connected to the first end of the second capacitor;

[0083] The first end of the fifth capacitor and the first end of the sixth capacitor are connected to the output end of the filter unit and the MCU voltage;

[0084] The input end of the filter unit is connected to the output end;

[0085] The second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor and the grounding end of the filtering unit are all grounded.

[0086] In this embodiment, the first end of the fourth capacitor is connected to the first end of the second capacitor; the first end of the fifth capacitor and the first end of the sixth capacitor are connected to the output end of the filtering unit and the MCU voltage; the input end of the filtering unit is connected to the output end; the second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor and the ground end of the filtering unit are all grounded.

[0087] Specifically, in a feasible implementation manner, when the key switch is turned on, the second resistor, the fifth resistor, the first diode and the key switch form a loop, the MOS tube is turned on, the MCU is powered on, the third transistor is turned on, the second resistor, the fifth resistor and the third transistor form a loop, and when the key switch is turned off, the output end continues to output voltage.

[0088] In this embodiment, when the button SW1 is pressed, R2, R5, D1, and SW1 form a current loop: VCC_IN-R2-R5-D1-GND. At this time, the gate Vg terminal voltage of the P-MOS tube Q1 is Vg<Vs due to the voltage division of R2 and R5, Q1 is turned on, VCC_OUT has voltage output, the MCU power is powered on, and the MCU reads the button trigger signal "MCU_POWER_KEY_DEC". The signal is read as a low level when it is powered on for the first time, and it is determined to be a power-on signal. The MCU outputs the control signal of the main power switch "MCU_POWER_CTL" as a high level, the transistor Q4 is turned on, and R2, R5, and Q4 form a loop. When the button SW1 is released, VCC_OUT has voltage output all the time, completing the self-locking power-on startup function.

[0089] Specifically, in a feasible implementation manner, after the push switch is turned on continuously for a preset time, the first resistor, the third capacitor and the push switch form a loop, the third capacitor is charged, the second transistor is turned on, the first transistor is turned on, the MOS tube is turned off, and the host is shut down.

[0090] In this embodiment, long press the button SW1, R1, C3, SW1 form a current loop: VCC_IN-R1-C3-SW1-GND, at this time, both ends of C3 start to charge, the voltage slowly rises, the base voltage of NPN transistor Q3 slowly rises, and after reaching the threshold voltage, transistor Q3 is turned on, causing PNP transistor Q2 to be turned on, there is no voltage drop across R2, the gate Vg of P-MOS tube Q1 = Vs, Q1 is cut off, and VCC_OUT has no voltage output. The long press shutdown time is configured by the parameters of R1, C3, R3, and R4. This function can be used when the machine is in a dead state.

[0091] In addition, in this circuit, the power supply "MCU_3.3V" of the control chip MCU is provided by VCC_OUT. As long as the button SW1 is pressed, VCC_OUT will have voltage output. The control chip MCU does not need to be powered all the time in the critical state, and finally realizes the function of reducing power consumption.

[0092] The technical solution of the present invention adopts a switch detection module to detect the key signal of the switch module, and forcibly disconnects the power supply after the switch module is continuously turned on for a preset time, thereby avoiding the problem that the control mechanism of the power enable signal fails when the device crashes, resulting in the device being unable to shut down.

[0093] The present invention also proposes a power switch control device, which includes a power switch control circuit. The specific structure of the power switch control circuit refers to the above-mentioned embodiment. Since the power switch control device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0094] The present invention also proposes a monitor, which includes a power switch control device. The specific structure of the power switch control device refers to the above embodiment. Since the monitor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0095] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A power switch control circuit, characterized in that: The power switch control circuit comprises: a switch module, a switch detection module and a control module, wherein the switch module, the switch detection module and the control module are connected in sequence; The switch module is used to control the switch of the power switch control circuit; The switch detection module is used to detect the key signal of the switch module, and disconnect the power supply after the switch module is continuously turned on for a preset time; The control module is used to control the startup.

2. The power switch control circuit according to claim 1, characterized in that: The power switch control circuit further includes: a filter module, the filter module is connected to the control module; The filtering module is used to protect the circuit from noise interference.

3. The power switch control circuit according to claim 1, characterized in that: The switch module comprises: a key switch; A first end of the key switch is grounded, and a second end of the key switch is connected to the switch detection module.

4. The power switch control circuit according to claim 2, characterized in that: The switch module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a seventh resistor, a third capacitor, a first triode, a second triode, a first diode and a second diode; A first end of the first resistor is connected to the input end, and a second end of the first resistor is connected to a first end of the third capacitor; The first end of the second resistor is connected to the input end and the control module respectively, and the second end of the second resistor is connected to the other end of the control module; A first end of the third resistor is connected to the input end, and a second end of the third resistor is connected to the emitter of the second transistor; A first end of the fourth resistor is connected to the emitter of the second transistor, and a second end of the fourth resistor is connected to the second end of the key switch; The first end of the seventh resistor is connected to the MCU voltage, and the second end of the seventh resistor is connected to the power switch button signal; The first end of the third capacitor is connected to the second end of the first resistor, and the second end of the third capacitor is connected to the second end of the fourth resistor; The base of the first transistor is connected to the collector of the second transistor, the emitter of the first transistor is connected to the input end, and the collector of the first transistor is connected to the second end of the second resistor; The anode of the first diode is connected to the control module, and the cathode of the first diode is connected to the second end of the fourth resistor; The anode of the second diode is connected to the power switch key signal, and the cathode of the second diode is connected to the cathode of the first diode.

5. The power switch control circuit according to claim 4, characterized in that: The control module includes: a MOS tube, a first capacitor, a second capacitor, a fifth resistor, a sixth resistor, an eighth resistor and a third triode; The gate of the MOS tube is connected to the second end of the second resistor, the source of the MOS tube is connected to the first end of the second resistor, and the drain of the MOS tube is connected to the output end; The first end of the first capacitor and the first end of the second capacitor are both connected to the output end, and the second end of the first capacitor and the second end of the second capacitor are both grounded; The first end of the fifth resistor is connected to the second end of the second resistor, and the second end of the fifth resistor is connected to the anode of the first diode; A first end of the sixth resistor is connected to the base of the third transistor, and a second end of the sixth resistor is connected to a total power signal; The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is grounded; The emitter of the third transistor is grounded, and the collector of the third transistor is connected to the second end of the fifth resistor.

6. The power switch control circuit according to claim 5, characterized in that: The filtering module includes: a fourth capacitor, a fifth capacitor, a sixth capacitor and a filtering unit; The first end of the fourth capacitor is connected to the first end of the second capacitor; The first end of the fifth capacitor and the first end of the sixth capacitor are connected to the output end of the filter unit and the MCU voltage; The input end of the filter unit is connected to the output end; The second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor and the grounding end of the filtering unit are all grounded.

7. The power switch control circuit according to claim 5, characterized in that: When the key switch is turned on, the second resistor, the fifth resistor, the first diode and the key switch form a loop, the MOS tube is turned on, the MCU is powered on, the third transistor is turned on, the second resistor, the fifth resistor and the third transistor form a loop, and when the key switch is turned off, the output end continues to output voltage.

8. The power switch control circuit according to claim 5, characterized in that: After the key switch is turned on for a preset time, the first resistor, the third capacitor and the key switch form a loop, the third capacitor is charged, the second transistor is turned on, the first transistor is turned on, the MOS tube is turned off, and the host is shut down.

9. A power switch control device, characterized in that: The power switch control device comprises a power switch control circuit as claimed in any one of claims 1 to 8.

10. A monitor, characterized in that: The monitor comprises the power switch control device as claimed in claim 9.

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