Zero-power-consumption on-off circuit and portable medical equipment

Abstract

The invention relates to the technical field of electronic circuits, and discloses a zero-power-consumption on-off circuit and portable medical equipment, and the circuit comprises a first switching circuit, a second switching circuit, a third switching circuit and a control module. When the second switching circuit receives a power-on signal, the second switching circuit outputs a switch-on signal to the first switching circuit, the second switching circuit outputs a power-on signal to the control module, the first switching circuit is switched on and outputs a standby voltage to the control module, and the control module is electrified and outputs a continuous switch-on signal to the third switching circuit. The third switching circuit is kept in a conducting state, and the control module controls the equipment to be powered on; when the second switching circuit receives a shutdown signal, the second switching circuit outputs a power-off signal to the control module, the control module outputs a disconnection signal to the third switching circuit, the third switching circuit is disconnected, and the control module controls the equipment to be powered off, so that the lithium battery is connected with the control module, and the purpose of prolonging the endurance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a zero-power switch circuit and a portable medical device. Background Art

[0002] Portable medical devices can only be powered by lithium batteries when not connected to a power adapter. Therefore, battery life is an important indicator of portable devices. In current portable devices, the standby power cannot be completely cut off after the device is turned off, which will consume the power of the lithium battery and reduce the battery life of the device. Summary of the invention

[0003] In view of this, the present invention provides a zero-power switch circuit and a portable medical device to solve the problem of insufficient battery life of the portable medical device.

[0004] In a first aspect, the present invention provides a zero-power switch circuit, comprising: a first switch circuit, a second switch circuit, a third switch circuit and a control module, wherein the first switch circuit has a first end connected to a lithium battery, a second end connected to a first end of the second switch circuit, and a third end connected to a first end of the control module; the second switch circuit has a second end connected to a lithium battery, a third end inputting a power supply voltage, and a fourth end connected to a second end of the control module; the third switch circuit has a first end connected to a second end of the first switch circuit, and a second end connected to a third end of the control module; when the second switch circuit receives a power-on signal, the second switch circuit outputs a conduction signal to the first switch circuit, the second switch circuit outputs a power-on signal to the control module, the first switch circuit is turned on and outputs a standby voltage to the control module, the control module is powered on and outputs a continuous conduction signal to the third switch circuit, the third switch circuit remains in a conduction state, and the control module controls the device to power on; when the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, the control module outputs a disconnection signal to the third switch circuit, the third switch circuit is disconnected, and the control module controls the device to power off.

[0005] In the present invention, when the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, and the control module outputs a disconnect signal to the third switch circuit. The third switch circuit is disconnected to disconnect the first switch circuit, thereby connecting the lithium battery to the control module, thereby achieving the purpose of increasing battery life.

[0006] In some embodiments, the first switch circuit includes: a first transistor, a first filter circuit and a first capacitor, wherein the first transistor, a first end of which is respectively connected to the lithium battery, the first end of the first capacitor and the first end of the first filter circuit, a second end of which is connected to the first end of the control module, and a control end of which is connected to the first end of the second switch circuit and the first end of the third switch circuit; the first capacitor, a second end of which is grounded; when the second switch circuit receives a power-on signal, the second switch circuit outputs a conduction signal to the first transistor, the second switch circuit outputs a power-on signal to the control module, the first transistor is turned on and outputs a standby voltage to the control module, the control module is powered on and outputs a continuous conduction signal to the third switch circuit, the third switch circuit remains in a conduction state, and the control module controls the device to power on; when the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, the control module outputs a disconnection signal to the third switch circuit, the third switch circuit is disconnected, and the control module controls the device to power off.

[0007] In some embodiments, the first filtering circuit includes: a second capacitor and a first resistor, wherein the first end of the second capacitor is respectively connected to the first end of the first transistor and the first end of the first resistor, and the second end of the second capacitor is respectively connected to the control end of the first transistor and the second end of the first resistor.

[0008] In some embodiments, the second switch circuit includes: a button switch, a second resistor, a third resistor, a fourth resistor, and a third capacitor, wherein the button switch has a first end connected to ground, a second end connected to ground, a third end connected to the supply voltage, and a fourth end connected to the first end of the second resistor; the second resistor has a second end connected to the first end of the third resistor, the first end of the fourth resistor, the first end of the third capacitor, and the second end of the control module, respectively; the third resistor has a second end connected to a lithium battery; the fourth resistor has a second end connected to the second end of the first switch circuit; the third capacitor has a second end connected to ground; when the button switch receives a power-on signal, the button switch is turned on and outputs a turn-on signal to the first switch circuit, and the second switch circuit outputs a power-on signal to the control module; when the button switch receives a power-off signal, the button switch is disconnected and outputs a power-off signal to the control module.

[0009] In some embodiments, the third switch circuit includes: a second transistor, a second filter circuit, a fifth resistor, and a sixth resistor, wherein the second transistor, a first end of which is connected to the first end of the fifth resistor, a second end of which is grounded, and a control end of which is respectively connected to the first end of the second filter circuit and the first end of the sixth resistor; the fifth resistor, a second end of which is connected to the second end of the first switch circuit; the sixth resistor, a second end of which is connected to the third end of the control module; the second filter circuit, a second end of which is grounded; when the second switch circuit receives a power-on signal, the second switch circuit outputs a conduction signal to the first switch circuit, the second switch circuit outputs a power-on signal to the control module, the first switch circuit is turned on and outputs a standby voltage to the control module, the control module is powered on and outputs a continuous conduction signal to the second transistor, the second transistor remains in a conducting state, and the control module controls the device to power on; when the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, the control module outputs a disconnection signal to the second transistor, the second transistor is disconnected, and the control module controls the device to power off.

[0010] In some embodiments, the second filtering circuit includes: a fourth capacitor and a seventh resistor, wherein the first end of the seventh resistor is respectively connected to the first end of the fourth capacitor and the control end of the second transistor, and the second end is connected to the second end of the fourth capacitor, and the second end is grounded.

[0011] In some embodiments, the zero-power switch circuit also includes: an adapter, which is connected to the alternating current; a fourth switch circuit, whose first end is connected to the second end of the first switch circuit, whose second end is grounded, and whose third end is connected to the adapter; when the adapter is powered, the fourth switch circuit is in a continuously on state, and the first switch circuit continuously outputs a standby voltage to the control module.

[0012] In some embodiments, the fourth switching circuit includes: a third transistor, a third filtering circuit, an eighth resistor, and a ninth resistor, wherein the third transistor has a first end connected to the first end of the eighth resistor, a second end connected to the ground, a control end connected to the first end of the third filtering circuit, and a control end connected to the first end of the ninth resistor; the eighth resistor has a second end connected to the second end of the first switching circuit; the ninth resistor has a second end connected to the control module; the third filtering circuit has a second end connected to the ground; when the adapter is powered, the third transistor is in a continuously on state.

[0013] In some embodiments, the third filtering circuit includes: a fifth capacitor and a tenth resistor, wherein the first end of the tenth resistor is respectively connected to the control end of the third transistor and the first end of the fifth capacitor, and the second end is connected to the second end of the fifth capacitor, and the second end is grounded.

[0014] In a second aspect, the present invention provides a portable medical device, including: a zero-power switch circuit according to the first aspect and any optional implementation manner thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a composition diagram of a zero-power switch circuit according to an embodiment of the present invention;

[0017] Figure 2 is a specific circuit structure diagram of a zero-power switch circuit according to an embodiment of the present invention;

[0018] Figure 3 4 is a composition diagram of another zero-power switch circuit according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] 1-first switch circuit; 2-second switch circuit; 3-third switch circuit; 4-control module; 5-fourth switch circuit; 11-first filter circuit; 31-second filter circuit; 51-third filter circuit;

[0021] Q1-first transistor; Q2-second transistor; Q3-third transistor;

[0022] SW-push button switch;

[0023] C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor; C5-fifth capacitor;

[0024] R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; R9-ninth resistor; R10-tenth resistor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] In this embodiment, a zero-power switch circuit is provided. Figure 1 As shown, it includes: a first switch circuit 1, a second switch circuit 2, a third switch circuit 3 and a control module 4.

[0027] like Figure 1 As shown, the first switch circuit 1 has a first end connected to the lithium battery, a second end connected to the first end of the second switch circuit 2 , and a third end connected to the first end of the control module 4 .

[0028] Specifically, the first end of the first switch circuit 1 is connected to the lithium battery, and the third end thereof is connected to the control module 4. When it is turned on, the lithium battery is connected to the control module 4, and the lithium battery supplies power to the control module 4; when it is turned off, the lithium battery is disconnected from the control module 4, and the control module 4 is powered off.

[0029] like Figure 1 As shown, the second switch circuit 2 has a second end connected to the lithium battery, a third end inputting the supply voltage, and a fourth end connected to the second end of the control module 4 .

[0030] Specifically, the second switch circuit 2 is used to receive a power-on signal and a power-off signal. When a power-on signal is received, the second switch circuit 2 outputs a power-on signal to the control module 4, and the second switch circuit 2 outputs a conduction signal to the first switch circuit 1; when a power-off signal is received, the second switch circuit 2 outputs only a power-off signal to the control module 4, and the on and off of the first switch circuit 1 is controlled by the control module 4.

[0031] like Figure 1 As shown, the third switch circuit 3 has a first end connected to the second end of the first switch circuit 1 , and a second end connected to the third end of the control module 4 .

[0032] Specifically, the on-off state of the third switch circuit 3 determines the on-off state of the first switch circuit 1. When the third switch circuit 3 is turned on, the first switch circuit 1 remains on, and when the third switch circuit 3 is turned off, the first switch circuit 1 is disconnected.

[0033] refer to Figure 1 The actual power-on and power-off process of the zero-power switch circuit is as follows:

[0034] (1) When the second switch circuit 2 receives a power-on signal, the second switch circuit 2 outputs a conduction signal to the first switch circuit 1, the second switch circuit 2 outputs a power-on signal to the control module 4, the first switch circuit 1 is turned on and outputs a standby voltage to the control module 4, the control module 4 is powered and outputs a continuous conduction signal to the third switch circuit 3, the third switch circuit 3 remains in the on state so that the first switch circuit 1 remains in the on state, and the control module 4 controls the device to power on.

[0035] Specifically, in order to ensure that the control module 4 is always powered after the switch is turned on, a second switch circuit 2 and a third switch circuit 3 are set, wherein the second switch circuit 2 and the third switch circuit 3 can control the on and off state of the first switch circuit 1. After power-on, in order to ensure that the control module 4 is always powered, after the first switch circuit 1 is turned on, the control module 4 controls the third switch circuit 3 to be turned on so that the first switch circuit 1 is always in the on state, and the lithium battery and the control module 4 are always in a connected state.

[0036] (2) When the second switch circuit 2 receives a shutdown signal, the second switch circuit 2 outputs a power-off signal to the control module 4, and the control module 4 outputs a disconnect signal to the third switch circuit 3. The third switch circuit 3 is disconnected to disconnect the first switch circuit 1, and the control module 4 controls the device to power off.

[0037] Optionally, the device may be a portable medical device, which is not limited herein.

[0038] Specifically, in order to completely cut off the power of the device when it is shut down, the control module 4 controls the third switch circuit 3 to be disconnected. After the third switch circuit 3 is disconnected, the first switch circuit 1 is disconnected, the lithium battery is disconnected from the control module 4, the control module 4 is powered off, and the control module 4 controls the device to power off, thereby saving lithium battery energy and solving the problem of insufficient battery life of portable medical equipment.

[0039] In some embodiments, Figure 2 As shown, the first switch circuit 1 includes: a first transistor Q1, a first filter circuit 11 and a first capacitor C1.

[0040] like Figure 2 As shown, the first transistor Q1, the first end of which is respectively connected to the lithium battery, the first end of the first capacitor C1 and the first end of the first filter circuit 11 (i.e., the second capacitor C2 and the first resistor R1), the second end of which is connected to the first end of the control module 4, and the control end of which is connected to the first end of the second switch circuit 2 (i.e., the fourth resistor R4) and the first end of the third switch circuit 3 (i.e., the fifth resistor R5); the first capacitor C1, the second end of which is grounded.

[0041] Figure 2 In the figure, the P1 terminal is connected to the lithium battery, the P2 terminal is connected to the first terminal of the control module 4, the P3 terminal is connected to the lithium battery, the P4 terminal is connected to the power supply voltage, the P4 terminal is connected to the second terminal of the control module 4, the P5 terminal is connected to the third terminal of the control module 4, and the P6 terminal is connected to the adapter.

[0042] Specifically, when the second switch circuit 2 receives a power-on signal, the second switch circuit 2 outputs a conduction signal to the first transistor Q1, the second switch circuit 2 outputs a power-on signal to the control module 4, the first transistor Q1 is turned on and outputs a standby voltage to the control module 4, the control module 4 is powered on and outputs a continuous conduction signal to the third switch circuit 3, the third switch circuit 3 remains in the on state so that the first transistor Q1 remains in the on state, and the control module 4 controls the device to power on.

[0043] Specifically, when the second switch circuit 2 receives a shutdown signal, the second switch circuit 2 outputs a power-off signal to the control module 4, the control module 4 outputs a disconnect signal to the third switch circuit 3, the third switch circuit 3 is disconnected to disconnect the first transistor Q1, and the control module 4 controls the device to power off.

[0044] In some embodiments, the first transistor Q1 is a PMOS transistor.

[0045] In some embodiments, Figure 2 As shown, the first filtering circuit 11 includes: a second capacitor C2 and a first resistor R1, wherein the first end of the second capacitor C2 is respectively connected to the first end of the first transistor Q1 and the first end of the first resistor R1, and the second end of the second capacitor C2 is respectively connected to the control end of the first transistor Q1 and the second end of the first resistor R1.

[0046] Specifically, the second capacitor C2 and the first resistor R1 form an RC filter circuit, but this is only an example and is not intended to be limiting.

[0047] In some embodiments, Figure 2 As shown, the second switch circuit 2 includes: a button switch SW, a second resistor R2, a third resistor R3, a fourth resistor R4, and a third capacitor C3.

[0048] like Figure 2 As shown, the button switch SW has a first end connected to the ground, a second end connected to the ground, a third end connected to the power supply voltage, and a fourth end connected to the first end of the second resistor R2; the second resistor R2 has a second end connected to the first end of the third resistor R3, the first end of the fourth resistor R4, the first end of the third capacitor C3, and the second end of the control module 4 respectively; the third resistor R3 has a second end connected to the lithium battery; the fourth resistor R4 has a second end connected to the second end of the first switch circuit 1 (i.e., the first transistor Q1); the third capacitor C3 has a second end connected to the ground.

[0049] Specifically, when the button switch SW receives a power-on signal, the button switch SW is turned on and outputs a turn-on signal to the first switch circuit 1, the second switch circuit 2 outputs a power-on signal to the control module 4, and the first switch circuit 1 is turned on and outputs a standby voltage to the control module 4. The control module 4 is powered on and outputs a continuous turn-on signal to the third switch circuit 3. The third switch circuit 3 remains in the on state so that the first switch circuit 1 remains in the on state, and the control module 4 controls the device to power on.

[0050] Specifically, when the button switch SW receives a shutdown signal, the button switch SW is disconnected and outputs a power-off signal to the control module 4. The control module 4 outputs a disconnect signal to the third switch circuit 3. The third switch circuit 3 is disconnected to disconnect the first switch circuit 1. The control module 4 controls the device to power off.

[0051] It should be noted that when the device is in the off state and the button switch SW is pressed, the button switch SW receives a power-on signal; when the device is in the on state and the button switch SW is pressed, the button switch SW receives a power-off signal.

[0052] In some embodiments, Figure 2 As shown, the third switch circuit 3 includes: a second transistor Q2, a second filter circuit 31, a fifth resistor R5, and a sixth resistor R6.

[0053] like Figure 2 As shown, the second transistor Q2, a first end of which is connected to the first end of the fifth resistor R5, a second end of which is grounded, and a control end of which is connected to the first end of the second filter circuit 31 (i.e., the fourth capacitor C4, the seventh resistor R7) and the first end of the sixth resistor R6; the fifth resistor R5, a second end of which is connected to the second end of the first switch circuit 1 (i.e., the first transistor Q1); the sixth resistor R6, a second end of which is connected to the third end of the control module 4; the second filter circuit 31, a second end of which is grounded.

[0054] Specifically, when the second switch circuit 2 receives a power-on signal, the second switch circuit 2 outputs a conduction signal to the first switch circuit 1, and the second switch circuit 2 outputs a power-on signal to the control module 4. After the first switch circuit 1 is turned on, it outputs a standby voltage to the control module 4. The control module 4 is powered on and outputs a continuous conduction signal to the second transistor Q2. The second transistor Q2 remains in the on state so that the first switch circuit 1 remains in the on state, and the control module 4 controls the device to power on.

[0055] Specifically, when the second switch circuit 2 receives a shutdown signal, the second switch circuit 2 outputs a power-off signal to the control module 4, the control module 4 outputs a disconnect signal to the second transistor Q2, the second transistor Q2 is disconnected to disconnect the first switch circuit 1, and the control module 4 controls the device to power off.

[0056] In some embodiments, Figure 2 As shown, the second filtering circuit 31 includes: a fourth capacitor C4 and a seventh resistor R7, wherein the first end of the seventh resistor R7 is respectively connected to the first end of the fourth capacitor C4 and the control end of the second transistor Q2, and the second end is connected to the second end of the fourth capacitor C4, and the second end is grounded.

[0057] Specifically, the fourth capacitor C4 and the seventh resistor R7 form an RC filter circuit, but this is only an example and is not intended to be limiting.

[0058] In some embodiments, Figure 3 As shown, the zero-power switch circuit also includes: an adapter connected to the AC power; a fourth switch circuit 5, a first end of which is connected to the second end of the first switch circuit 1, a second end of which is grounded, and a third end of which is connected to the adapter.

[0059] Specifically, when the adapter supplies power, the fourth switch circuit 5 is in a continuously turned-on state so that the first switch circuit 1 is continuously turned on, and the first switch circuit 1 continuously outputs the standby voltage to the control module 4 .

[0060] Specifically, the adapter is connected to the mains, and when the mains and the lithium battery are connected to the switch circuit, that is, when both the mains and the lithium battery have power supply capabilities, the mains will be used to power the device first, so there is no need to consider whether the lithium battery consumes power. In this embodiment, a fourth switch circuit 5 is provided. After the fourth switch circuit 5 is connected to the mains, the fourth switch circuit 5 is always in an on state, so that the first switch circuit 1 is always in an on state, and the mains always supplies power to the control module 4.

[0061] Specifically, after the fourth switch circuit 5 is turned on, when the second switch circuit 2 receives the switch signal, the second switch circuit 2 outputs a power-on signal to the control module 4, and the control module 4 controls the device to power on.

[0062] Specifically, after the fourth switch circuit 5 is turned on, when the second switch circuit 2 receives a shutdown signal, the second switch circuit 2 outputs a power-off signal to the control module 4, and the control module 4 controls the device to power off.

[0063] In some embodiments, Figure 2As shown, the fourth switch circuit 5 includes: a third transistor Q3, a third filter circuit 51, an eighth resistor R8, and a ninth resistor R9, wherein the third transistor Q3, a first end thereof is connected to the first end of the eighth resistor R8, a second end thereof is grounded, and a control end thereof is respectively connected to the first end of the third filter circuit 51 (i.e., the tenth resistor R10, the fifth capacitor C5) and the first end of the ninth resistor R9; the eighth resistor R8, a second end thereof is connected to the second end of the first switch circuit 1 (i.e., the first transistor Q1); the ninth resistor R9, a second end thereof is connected to the control module 4; the third filter circuit 51, a second end thereof is grounded; when the adapter is powered, the third transistor Q3 is in a continuously on state so that the first switch circuit 1 is continuously on.

[0064] In some embodiments, Figure 2 As shown, the third filtering circuit 51 includes: a fifth capacitor C5 and a tenth resistor R10, wherein the first end of the tenth resistor R10 is respectively connected to the control end of the third transistor Q3 and the first end of the fifth capacitor C5, and the second end is connected to the second end of the fifth capacitor C5, and the second end is grounded.

[0065] Specifically, the fifth capacitor C5 and the tenth resistor R10 form an RC filter circuit, but this is only an example and is not intended to be limiting.

[0066] refer to Figure 2 When the device is connected to a power adapter and powered by the adapter, there is no need to consider the battery life issue. The signal at the P7 terminal is high, the G pole of the first transistor Q1 is at a low level, the first transistor Q1 is turned on, and the lithium battery powers the control module 4. The control module 4 works. Figure 2 The voltage at the P5 terminal meets the high level range of the threshold for judging the high and low levels of the signal at the IO port of the control module 4; when the SW is not pressed to send the power-on signal, the signal at the P5 terminal is an invalid high level signal, and the device is not powered on; when the SW is pressed, the signal at the P5 terminal is a valid low level signal, and the control module 4 sends a power-on command to control the device to power on.

[0067] In this embodiment, a portable medical device is provided, including: the zero-power switch circuit of the above embodiment and any implementation method thereof. When the second switch circuit 2 receives a shutdown signal, the second switch circuit 2 outputs a power-off signal to the control module 4, and the control module 4 outputs a disconnection signal to the third switch circuit 3, and the third switch circuit 3 is disconnected to disconnect the first switch circuit 1, so that the lithium battery is connected to the control module 4, thereby achieving the purpose of increasing the battery life.

[0068] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A zero-power switch circuit, characterized in that: include: A first switch circuit, a second switch circuit, a third switch circuit and a control module, wherein: a first switch circuit, a first end of which is connected to the lithium battery, a second end of which is connected to the first end of the second switch circuit, and a third end of which is connected to the first end of the control module; a second switch circuit, a second end of which is connected to the lithium battery, a third end of which is input with a supply voltage, and a fourth end of which is connected to the second end of the control module; a third switch circuit, a first end of which is connected to the second end of the first switch circuit, and a second end of which is connected to the third end of the control module; When the second switch circuit receives a power-on signal, the second switch circuit outputs a conduction signal to the first switch circuit, the second switch circuit outputs a power-on signal to the control module, the first switch circuit is turned on and outputs a standby voltage to the control module, the control module is powered on and outputs a continuous conduction signal to the third switch circuit, the third switch circuit remains in a conducting state, and the control module controls the device to power on; When the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, the control module outputs a disconnect signal to the third switch circuit, the third switch circuit is disconnected, and the control module controls the device to power off.

2. The zero-power switch circuit according to claim 1, characterized in that: The first switch circuit includes: a first transistor, a first filter circuit and a first capacitor, wherein: A first transistor, a first end of which is respectively connected to the lithium battery, the first end of the first capacitor and the first end of the first filter circuit, a second end of which is connected to the first end of the control module, and a control end of which is connected to the first end of the second switch circuit and the first end of the third switch circuit; A first capacitor, a second end of which is grounded; When the second switch circuit receives a power-on signal, the second switch circuit outputs a conduction signal to the first transistor, the second switch circuit outputs a power-on signal to the control module, the first transistor is turned on and outputs a standby voltage to the control module, the control module is powered on and outputs a continuous conduction signal to the third switch circuit, the third switch circuit remains in a conducting state, and the control module controls the device to power on; When the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, the control module outputs a disconnect signal to the third switch circuit, the third switch circuit is disconnected, and the control module controls the device to power off.

3. The zero-power switch circuit according to claim 2, characterized in that: The first filtering circuit includes: a second capacitor and a first resistor, wherein: The second capacitor has a first end connected to the first end of the first transistor and the first end of the first resistor, and a second end connected to the control end of the first transistor and the second end of the first resistor.

4. The zero-power switch circuit according to claim 1, characterized in that: The second switch circuit includes: a button switch, a second resistor, a third resistor, a fourth resistor, and a third capacitor, wherein: a push button switch, a first end of which is grounded, a second end of which is grounded, a third end of which is connected to the supply voltage, and a fourth end of which is connected to the first end of the second resistor; A second resistor, a second end of which is respectively connected to the first end of the third resistor, the first end of the fourth resistor, the first end of the third capacitor, and the second end of the control module; a third resistor, a second end of which is connected to the lithium battery; a fourth resistor, a second end of which is connected to the second end of the first switch circuit; a third capacitor, a second terminal of which is grounded; When the button switch receives a power-on signal, the button switch is turned on and outputs a turn-on signal to the first switch circuit, and the second switch circuit outputs a power-on signal to the control module; When the button switch receives a shutdown signal, the button switch is disconnected and outputs a power-off signal to the control module.

5. The zero-power switch circuit according to claim 1, characterized in that: The third switch circuit includes: a second transistor, a second filter circuit, a fifth resistor, and a sixth resistor, wherein: a second transistor, a first end of which is connected to the first end of the fifth resistor, a second end of which is grounded, and a control end of which is respectively connected to the first end of the second filter circuit and the first end of the sixth resistor; a fifth resistor, a second end of which is connected to the second end of the first switch circuit; a sixth resistor, a second end of which is connected to the third end of the control module; A second filter circuit, a second end of which is grounded; When the second switch circuit receives a power-on signal, the second switch circuit outputs a conduction signal to the first switch circuit, the second switch circuit outputs a power-on signal to the control module, the first switch circuit is turned on and outputs a standby voltage to the control module, the control module is powered on and outputs a continuous conduction signal to the second transistor, the second transistor remains in a conducting state, and the control module controls the device to power on; When the second switch circuit receives a shutdown signal, the second switch circuit outputs a power-off signal to the control module, the control module outputs a disconnection signal to the second transistor, the second transistor is disconnected, and the control module controls the device to power off.

6. The zero-power switch circuit according to claim 5, characterized in that: The second filtering circuit includes: a fourth capacitor and a seventh resistor, wherein: A seventh resistor, wherein a first end thereof is respectively connected to the first end of the fourth capacitor and the control end of the second transistor, a second end thereof is connected to the second end of the fourth capacitor, and the second end is grounded.

7. The zero-power switch circuit according to claim 1, characterized in that: Also includes: an adapter, which is connected to the alternating current; a fourth switch circuit, a first end of which is connected to the second end of the first switch circuit, a second end of which is grounded, and a third end of which is connected to the adapter; When the adapter is supplying power, the fourth switch circuit is in a continuously on state, and the first switch circuit continuously outputs a standby voltage to the control module.

8. The zero-power switch circuit according to claim 7, characterized in that: The fourth switch circuit includes: a third transistor, a third filter circuit, an eighth resistor, and a ninth resistor, wherein: a third transistor, a first end of which is connected to the first end of the eighth resistor, a second end of which is grounded, and a control end of which is respectively connected to the first end of the third filter circuit and the first end of the ninth resistor; an eighth resistor, a second end of which is connected to the second end of the first switch circuit; a ninth resistor, a second end of which is connected to the control module; A third filter circuit, a second end of which is grounded; When the adapter is powered, the third transistor is in a continuously turned-on state.

9. The zero-power switch circuit according to claim 8, characterized in that: The third filtering circuit includes: a fifth capacitor and a tenth resistor, wherein: A tenth resistor, a first end of which is respectively connected to the control end of the third transistor and the first end of the fifth capacitor, a second end of which is connected to the second end of the fifth capacitor, and the second end is grounded.

10. A portable medical device, characterized in that: include: The zero-power switch circuit according to any one of claims 1 to 9.

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