Wireless module power-off protection device of hard switch equipment and hard switch equipment

Abstract

The utility model provides a hard switch device and a wireless module power-off protection device thereof. The hard switch device comprises a voltage source circuit and a wireless module, and the wireless module is electrically connected with the voltage source circuit. The wireless module power-off protection device is electrically connected between a voltage source circuit and a wireless module and comprises a first electronic switch, an energy storage unit, a second electronic switch, a timing unit and a third electronic switch. The energy storage unit and the wireless module are electrically connected with the voltage source circuit through the first electronic switch. The energy storage unit is further electrically connected with the wireless module through the second electronic switch, the timing unit and the third electronic switch in sequence. And when the hard switch equipment is powered down, the first electronic switch is switched off, and the second electronic switch and the third electronic switch are switched on, so that the energy storage unit discharges, time sequence voltage is provided for the wireless module through the timer, and the wireless module is controlled to work under the time sequence voltage.

Description

Technical Field

[0001] The present invention relates to the field of wireless module power-off protection devices, and in particular to a wireless module power-off protection device of a hard switch device and a hard switch device. Background Art

[0002] At present, common wireless modules in the market all require power-off sequence, but because wireless modules are widely used in mobile devices, and mobile devices are equipped with batteries, they can easily meet the power-off sequence requirements. With the booming development of the IoT development service market, more and more hard-switch devices have also joined wireless modules to meet the needs of the IoT, such as home ventilators. However, wireless module suppliers only describe the various consequences that may occur if the power-on sequence is not executed, and have not optimized the application of hard switches. At present, engineers pay great attention to the power-on sequence when using chips. Due to the limitations of the device power supply method, they often choose to ignore the requirements of the wireless module power-off sequence.

[0003] There is no universal technical solution in the current market, and the power-off timing requirements of wireless modules are often ignored. When problems such as data loss and module damage occur on the user side, the application party will be completely passive. Summary of the invention

[0004] The utility model provides a wireless module power-off protection device applied to a hard switch device, which can realize the power-off timing requirement of the hard switch device when using the wireless module.

[0005] In a first aspect, the utility model provides a wireless module power-off protection device of a hard switch device, wherein the hard switch device includes a voltage source circuit, and the wireless module is electrically connected to the voltage source circuit; the wireless module power-off protection device is electrically connected between the voltage source circuit and the wireless module, and includes a first electronic switch, an energy storage unit, a second electronic switch, a timing unit, and a third electronic switch; the energy storage unit and the wireless module are electrically connected to the voltage source circuit respectively through the first electronic switch; the energy storage unit is electrically connected to the wireless module through the second electronic switch, the timing unit, and the third electronic switch in sequence; wherein:

[0006] When the hard switch device is powered on, the voltage source circuit outputs an operating voltage, the first electronic switch is turned on, the second electronic switch and the third electronic switch are turned off, and the energy storage unit and the timing unit are cut off respectively, so that the wireless module works at the voltage output by the voltage source circuit, and the energy storage unit is charged at the voltage output by the voltage source circuit;

[0007] When the hard switch device loses power, the voltage source circuit stops outputting the operating voltage, the first electronic switch is disconnected, and the second and third electronic switches are turned on, so that the energy storage unit discharges and provides a timing voltage to the wireless module through a timer, which is used to control the wireless module to operate under the timing voltage.

[0008] Preferably, the input end of the first electronic switch is electrically connected to the voltage source circuit, the output end of the first electronic switch is electrically connected to the energy storage unit and the wireless module respectively, and the first electronic switch is turned on at a high level and turned off at a low level.

[0009] Preferably, the second electronic switch includes a first sub-switch and a second sub-switch, the first input terminal of the first sub-switch is electrically connected to the voltage source circuit, the second input terminal of the first sub-switch is electrically connected to the energy storage unit, the output terminal of the first sub-switch is electrically connected to the timing unit, and the first sub-switch is turned on when the first input terminal is at a low level and the second input terminal is at a high level; the second input terminal of the second sub-switch is electrically connected to the energy storage unit, the output terminal of the second sub-switch is electrically connected to the timing unit, and the second sub-switch is turned on when the first input terminal is at a low level and the second input terminal is at a high level.

[0010] Preferably, the second sub-switch includes a delay circuit, a first switch tube, a second switch tube, and a third switch tube. The first input end and the second input end of the first switch tube serve as the first input end and the second input end of the second sub-switch. The output end of the first switch tube is electrically connected to the input end of the second switch tube. The output end of the second switch tube is electrically connected to the input end of the third switch tube. The output end of the third switch tube serves as the output end of the second sub-switch. The delay circuit is electrically connected to a node between the second switch tube and the third switch tube, and is used to delay the electrical signal input to the timing unit.

[0011] Preferably, when the voltage output by the third switch tube is at a low level, the timing unit works.

[0012] Preferably, when the voltage output by the third switch tube is at a low level, the timing unit works and a high level timing voltage is input to the timing unit.

[0013] Preferably, when the input end of the third electronic switch is electrically connected to the output end of the timing unit, the output end of the third electronic switch is electrically connected to the power switch of the wireless module, and the third electronic switch is turned on when the timing unit outputs a high-level timing voltage, it is used to control the wireless module to turn on or off.

[0014] Preferably, the timing unit is a 555 timer, the first sub-switch is a POMS field effect tube, the first switch tube, the second switch tube, and the third switch tube are respectively a POMS field effect tube, a COMS transistor, and a COMS transistor; the first electronic switch and the third electronic switch are respectively a POMS field effect tube and an NPN transistor.

[0015] In a second aspect, the utility model provides a hard switch device, including a wireless module, a voltage source circuit, and a wireless module power-off protection device of the hard switch device.

[0016] The above-mentioned hard switch device has a wireless module power-off protection device. The wireless module power-off protection device controls the energy storage unit through the second electronic switch and the third electronic switch when the hard switch device is powered off, and controls the power of the wireless module to be turned on and off in a timely manner through the timing unit, thereby meeting the timing requirements for powering off the wireless module. This avoids the problem that the hard switch device cannot execute the power-off timing sequence, resulting in the wireless module being unable to execute the logout action, thereby causing the loss of important user data, and the problem that the wireless module is damaged by Flash due to the inability to execute the power-off timing sequence. The application of the wireless module power-off protection device to the hard switch device greatly improves the compatibility of the hard switch device with conventional wireless modules on the market and the reliability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work.

[0018] Figure 1 A wireless module power-off protection device is provided in an embodiment of the utility model.

[0019] Figure 2 A partial circuit schematic diagram of a wireless module power-off protection device provided in an embodiment of the utility model.

[0020] Figure 3 A partial circuit schematic diagram of a wireless module power-off protection device provided in an embodiment of the utility model.

[0021] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] In the description of the present utility model, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In order to make the content of the utility model more clearly and more accurately understood, it will now be described in detail with reference to the accompanying drawings. The accompanying drawings of the specification illustrate examples of embodiments of the utility model, wherein the same reference numerals represent the same elements. It is understood that the scales shown in the accompanying drawings of the specification are not the scales of the actual implementation of the utility model, which are only for the purpose of illustration and are not drawn according to the original size.

[0025] Please refer to Figures 1 to 3 , Figure 1 A wireless module power-off protection device 2 is provided in an embodiment of the utility model. In this embodiment, the wireless module power-off protection device 2 is applied to a hard switch device. The hard switch device is a device that is powered on and off by a hard switch, such as a home ventilator, an oxygen therapy device and other medical equipment. The hard switch device includes a voltage source circuit 1, a wireless module power-off protection device 2, and a wireless module 3. The voltage source circuit 1 is electrically connected to the wireless module 3, and the wireless module power-off protection device 2 is electrically connected between the voltage source circuit 1 and the wireless module 3. The wireless module power-off protection device 2 is used to control the power-off timing of the wireless module 3 installed in the hard switch device to meet the power-off timing requirements of the wireless module 3.

[0026] Specifically, the wireless module power-off protection device 2 includes a first electronic switch 21, an energy storage unit 22, a second electronic switch 23, a timing unit 24, and a third electronic switch 25. The energy storage unit 22 and the wireless module 1 are electrically connected to the voltage source circuit 1 through the first electronic switch 21. The energy storage unit 22 is electrically connected to the wireless module 3 through the second electronic switch 23, the timing unit 24, and the third electronic switch 25 in turn.

[0027] When the hard switch device is powered on, the voltage source circuit 1 outputs an operating voltage. At this time, the first electronic switch 21 is turned on, the second electronic switch 23 and the third electronic switch 25 are turned off, and the energy storage unit 22 and the timing unit 24 are cut off respectively, so that the wireless module 3 works under the voltage output by the voltage source circuit 1, and the energy storage unit 22 is charged under the voltage output by the voltage source circuit 1.

[0028] When the hard switch device loses power, the voltage source circuit 1 stops outputting the operating voltage. At this time, the first electronic switch 21 is disconnected and the second electronic switch 23 and the third electronic switch 25 are turned on, so that the energy storage unit 22 discharges and provides a timing voltage to the wireless module 3 through the timing unit 24, which is used to control the wireless module 3 to operate under the timing voltage.

[0029] The above-mentioned hard switch device has a wireless module power-off protection device. The wireless module power-off protection device 2 controls the energy storage unit 22 through the second electronic switch 23 and the third electronic switch 25 when the hard switch device is powered off. The power of the wireless module 3 is controlled to be turned on and off in a timely manner through the timing unit 24, thereby meeting the timing requirements for powering off the wireless module 3, thereby avoiding the problems that the hard switch device cannot execute the power-off sequence, resulting in the wireless module 3 being unable to execute the logout action and the Flash of the wireless module 3 being damaged, and further reducing the possibility of loss of important user data. The application of the wireless module power-off protection device 2 to the hard switch device greatly improves the compatibility of the hard switch device with conventional wireless modules on the market and the reliability of use.

[0030] Please refer to Figure 2 , Figure 2The schematic diagram of the partial circuit of the wireless module power-off protection device is shown in FIG. The voltage source circuit 1 includes a power conversion circuit 11, a unidirectional switch tube D1 and a fourth switch tube Q1. The conversion circuit 11 is used to reduce the power supply voltage. The output end of the power conversion circuit 11 is electrically connected to the unidirectional switch tube D1, and the unidirectional switch tube D1 is an ordinary diode with unidirectional conductivity. The input end of the unidirectional switch tube D1 is electrically connected to the power conversion circuit 11, and the output end is electrically connected to the first electronic switch 21. The hard switch device is powered on, and the voltage source circuit 1 works. The input power VIN is converted into the working voltage required by the wireless module 3 by the power conversion circuit 11, and then the power supply VBAT is output. Since the unidirectional switch tube D1 is electrically connected between the power conversion circuit 11 and the first electronic switch 21, the output power VBAT turns on the unidirectional switch tube D1 and reaches the first electronic switch 21 to output a low-level timing voltage. The fourth switch tube Q1 is an NPN transistor that can control the switch. The base B of the fourth switch tube Q1 is used to receive the switch signal Supercap-Charge, the emitter E is grounded, and the collector C is electrically connected to the first electronic switch 21. The switch signal Supercap-Charge controls the fourth switch tube Q1 to turn on. When the fourth switch tube Q1 is turned on, the voltage source circuit 1 outputs a high-level timing voltage. When the fourth switch tube Q1 is turned off, the voltage source circuit 1 has no output, that is, the output end of the voltage source circuit 1 is at a low level.

[0031] The input end of the first electronic switch 21 is electrically connected to the voltage source circuit 1, and the output end of the first electronic switch 21 is electrically connected to the energy storage unit 22, the second electronic switch 23, and the wireless module 3 respectively. The first electronic switch 21 is turned on at a high level and turned off at a low level. Specifically, the input end of the first electronic switch 21 is electrically connected to the output end of the voltage source circuit 1. Among them, when the output end of the voltage source circuit 1 is at a high level, the first electronic switch 21 is turned on. At this time, the voltage source circuit 1 is electrically connected to the energy storage unit 22 and the wireless module 3, and is used to power the wireless module 3 so that the wireless module 3 works normally; at the same time, the voltage source circuit 1 also charges the energy storage unit 22 so that the energy storage unit 22 reserves electrical energy. When the output end of the voltage source circuit 1 is at a low level, the first electronic switch 21 is turned off. At this time, the voltage source circuit 1 is disconnected from the energy storage unit 22 and the wireless module 3, so that the energy storage unit 22 is discharged to provide a working voltage for the wireless module 3 to work normally.

[0032] Specifically, the first electronic switch 21 is a P-type field effect transistor (positive channel Metal Oxide Semiconductor, PMOS) Q3, which is used to implement the switch of the circuit in the switch circuit. The first input end of the first electronic switch 21 is the gate G, the second input end is the source S, and the output end is the drain D. The gate G of the first electronic switch Q3 is electrically connected to the emitter C of the fourth switch tube Q1, and the source S is electrically connected to the output end of the unidirectional switch tube D1. The drain D of the first electronic switch 21 is electrically connected to the energy storage unit 22, the second electronic switch 23 and the wireless module 3 respectively. When the hard switch device is powered on, the output power supply VBAT turns on the switch tube D1 to reach the source S of the first electronic switch Q3, and inputs a low-level timing voltage. At the same time, the switch signal Supercap-Charge controls the switch tube Q1 to turn on the gate G of the first electronic switch Q3, and inputs a high-level timing voltage. At this time, the gate G of the first electronic switch Q3 is high, the source S is low, and the source S and drain D of the first electronic switch Q3 are turned on and output a high-level timing voltage. At this time, the second electronic switch 23 and the third electronic switch 25 are turned off, and the energy storage unit 22 and the timing unit 24 are cut off respectively.

[0033] Please refer to Figure 3 , Figure 3 The schematic diagram of the partial circuit of the wireless module power-off protection device is shown in FIG. The energy storage unit 22 is a 0.47Ω super capacitor C9, which is electrically connected to the drain D of the first electronic switch 21, the input end of the second electronic switch 23, and the wireless module 3. Specifically, when the first electronic switch Q3 is turned on, the voltage source circuit 1 is electrically connected to the energy storage unit 22 and the wireless module 3 to supply power to the wireless module 3 so that the wireless module 3 works normally. At the same time, the voltage source circuit 1 also charges the energy storage unit 22 so that the energy storage unit 22 reserves electric energy. When the hard switching device loses power, the voltage source circuit 1 stops outputting the operating voltage, the output end of the voltage source circuit 1 is at a low level, and the first electronic switch Q3 is disconnected. At this time, the voltage source circuit 1 is disconnected from the super capacitor C9 and the wireless module 3, and the 100uF capacitor C13, the 10uF capacitor C14, and the 0.1uF capacitor C15 are connected to the wireless module 3 in sequence to supply power to the wireless module power supply 3. The super capacitor C9 discharges and provides a timing voltage to the wireless module 3 through the timing unit 24.

[0034] The input end of the second electronic switch 23 is electrically connected to the voltage source circuit 1, the first electronic switch 21 and the energy storage unit 22 respectively, and the output end of the second electronic switch 23 is electrically connected to the timing unit 24 and the wireless module 3 respectively. The second electronic switch 23 is turned on at a high level and turned off at a low level. Specifically, the second electronic switch 23 includes a first sub-switch 231 and a second sub-switch 232.

[0035] The first input terminal of the first sub-switch 231 is electrically connected to the voltage source circuit, the second input terminal of the first sub-switch 231 is electrically connected to the energy storage unit 22, the output terminal of the first sub-switch 231 is electrically connected to the timing unit 24, and the first sub-switch 231 is turned on when the first input terminal is at a low level and the second input terminal is at a high level.

[0036] Specifically, the first sub-switch 231 is a P-type field effect transistor Q4. The first input terminal of the first sub-switch Q4 is the gate G, the second input terminal is the source S, and the output terminal is the drain D. The gate G of the first sub-switch Q4 is electrically connected to the voltage source circuit, and inputs a power supply voltage with a low level timing. The source S of the first sub-switch Q4 is electrically connected to the super capacitor C9, and inputs a high level timing voltage. The first sub-switch Q4 is turned on when the gate G is at a low level and the source S is at a high level. The drain D of the first sub-switch Q4 is electrically connected to the timing unit 24.

[0037] The first input terminal of the second sub-switch 232 is electrically connected to the power supply voltage, the second input terminal of the second sub-switch 232 is electrically connected to the energy storage unit 22, the output terminal of the second sub-switch 232 is electrically connected to the timing unit 24, and the second sub-switch 232 is turned on when the first input terminal is at a low level and the second input terminal is at a high level. Specifically, the second sub-switch 232 includes a first switch tube 2321, a second switch tube 2322, a delay circuit 2323, and a third switch tube 2324.

[0038] The first input terminal and the second input terminal of the first switch tube 2321 serve as the first input terminal and the second input terminal of the second sub-switch 232. The first input terminal of the first switch tube 2321 is electrically connected to the voltage source circuit, the second input terminal of the first switch tube 2321 is electrically connected to the energy storage unit 22, and the output terminal of the first switch tube 2321 is electrically connected to the second switch tube 2322. The first switch tube 2321 is turned on when the first input terminal is at a low level and the second input terminal is at a high level.

[0039] Specifically, the first switch tube 2321 is a P-type field effect transistor Q5, the first input end of the first switch tube Q5 is the gate G, the second input end is the source S, and the output end is the drain D. The gate G and the source S of the first switch tube Q5 serve as the first input end and the second input end of the second sub-switch, respectively. The gate G of the first switch tube Q5 is electrically connected to the voltage source circuit, and the power supply voltage with a low level timing is input. The source S of the first switch tube Q5 is electrically connected to the super capacitor C9, and the high level timing voltage is input. The first switch tube Q5 is turned on when the gate G is low and the source S is high. The drain D of the first switch tube Q5 is electrically connected to the input end of the second switch tube 2322.

[0040] The input end of the second switch tube 2322 is electrically connected to the first switch tube, and the output end of the second switch tube 2322 is electrically connected to the delay circuit 2323. The delay circuit 2323 is electrically connected to the node between the second switch tube 2322 and the third switch tube 2324, and is used to delay the electrical signal input to the timing unit 24.

[0041] Specifically, the second switch tube 2322 is a transistor (Complementary Metal Oxide Semiconductor, CMOS) U6, which can realize the switch function in the circuit. The input terminal I of the second switch tube U6 is electrically connected to the drain D of the first switch tube Q5, and the output terminal O is electrically connected to the delay circuit 2323.

[0042] The delay circuit 2323 is an RC delay circuit, which is composed of a 15kΩ resistor R8 and a 1nF capacitor C9, and is used to delay the electrical signal input to the timing unit 24. The delay time can be changed by changing the values ​​of the resistor and the capacitor. The RC delay circuit is electrically connected to the node between the second switch tube 2322 and the third switch tube 2324. The input end of the RC delay circuit is connected to the output end O of the second switch tube U6, and the output end is connected to the third switch tube 2324.

[0043] The input end of the third switch tube 2324 is electrically connected to the delay circuit 2323, and the output end of the third switch tube 2324 is electrically connected to the timing unit 24 as the output end of the second sub-switch 232. When the voltage output by the third switch tube 2324 is at a low level, the timing unit 24 starts to work, and the timing unit 24 inputs a high-level timing voltage.

[0044] Specifically, the third switch tube 2324 is a transistor U7, which has the same function as the second switch tube. The input end I of the third switch tube U7 is electrically connected to the output end of the delay circuit 2323, the output end O of the third switch tube U7 serves as the output end of the second sub-switch, and the output end O of the third switch tube U7 is electrically connected to the timing unit 24.

[0045] The timing unit 24 is a 555 timer U3, and the input end of the timer U3 is electrically connected to the first sub-switch 231 and the second sub-switch 232 respectively. The output end of the timer U3 is electrically connected to the third electronic switch 25. The pins of the 555 timer are electrically connected to the 499Ω resistor R4, the 1kΩ resistor R7, the 4.7uF capacitor C11 and the 0.1uF capacitor C12 respectively. When the first sub-switch Q4 is turned on, the energy storage unit 22 supplies power to the timer U3. Since the second sub-switch 232 includes a combination circuit formed by the first switch tube Q5, the second switch tube U6, the RC delay circuit, and the third switch tube U7 connected in sequence, after the second sub-switch 232 is turned on, the TRG pin of the 555 timer receives a low-level trigger signal of about 15us. At this time, the 555 timer starts to work, and the output pin OUT of the 555 timer outputs a high-level signal of 2.5s.

[0046] The input end of the third electronic switch 25 is electrically connected to the output end of the timing unit 24, and the output end of the third electronic switch 25 is electrically connected to the power switch of the wireless module 3. The third electronic switch 25 is turned on when the timing unit 24 outputs a high-level timing voltage, and is used to control the wireless module 3 to be turned on or off.

[0047] Specifically, the third electronic switch 25 is an NPN transistor Q2. The input end of the third electronic switch Q2 is a base B, which is electrically connected to the output end of the 555 timer, the output end of the third electronic switch Q2 is a collector C, which is electrically connected to the power control end of the wireless module 3, the emitter E of the third electronic switch Q2 is grounded, and the third electronic switch tube Q2 is turned on when the base B receives a 2.5s high level signal output by the timer U3.

[0048] The wireless module 3 includes a power control terminal PWR_ON / OFF. After the timer U3 is turned on by the third electronic switch Q2, the PWR_ON / OFF signal of the wireless module U2 is pulled down for 2.5s, and then restored to a high level, to achieve the power-off timing requirements of the hard switch device when using the wireless module.

[0049] Please refer to Figure 2 and Figure 3 The working process of how the wireless module power-off protection device 2 controls the wireless module 3 is as follows.

[0050] When the hard switch device is powered on, the voltage source circuit 1 works, and the input power VIN is converted into the working voltage required by the wireless module U3 by the power conversion circuit 11, and then the output power VBAT is output. The output power VBAT turns on the unidirectional switch tube D1 to reach the source S of the first electronic switch Q3 to input a low-level timing voltage. At the same time, the switch signal Supercap-Charge controls the fourth switch tube Q1 to turn on. When the fourth switch tube Q1 receives the high-level timing voltage and turns on, the gate G of the first electronic switch Q3 inputs a high-level timing voltage. At this time, the gate G of the first electronic switch Q3 is at a high level, the source S is at a low level, and the source S and drain D of the first electronic switch Q3 are turned on and output a high-level timing voltage. The second electronic switch 23 and the third electronic switch Q2 are disconnected, and the supercapacitor C9 and the timer U3 are cut off respectively, so that the wireless module U2 works at the voltage output by the voltage source circuit 1, and the supercapacitor C9 is charged at the voltage output by the voltage source circuit 1.

[0051] When the hard switch device is powered off, the voltage source circuit 1 stops outputting the working voltage, the output end of the voltage source circuit 1 is at a low level, the first electronic switch Q3 is disconnected, and the second electronic switch 23 and the third electronic switch Q2 are turned on. At this time, the voltage source circuit 1 is disconnected from the super capacitor C9 and the wireless module U2, the super capacitor C9 is discharged and continuously supplies power to the wireless module for a period of time. The second electronic switch 23 includes a first sub-switch Q4 and a second sub-switch 232. The gate G of the first sub-switch Q4 inputs a power supply voltage with a low level timing. The source S of the first sub-switch Q4 inputs a high level timing voltage. The first sub-switch Q4 is turned on when the gate G is at a low level and the source S is at a high level. The drain D of the first sub-switch Q4 is electrically connected to the timing unit 24. When the first sub-switch Q4 is turned on, the super capacitor C9 supplies power to the timer U3. The second sub-switch 232 includes a combination circuit formed by connecting the first switch tube Q5, the second switch tube U6, the RC delay circuit, and the third switch tube U7 in sequence. The gate G of the first switch tube Q5 inputs a power supply voltage of a low level timing, the source S of the first switch tube Q5 inputs a high level timing voltage, and the first switch tube Q5 is turned on when the gate G is at a low level and the source S is at a high level. The input terminal I of the second switch tube U6 is electrically connected to the drain D of the first switch tube Q5, and the output terminal O is electrically connected to the input terminal of the RC delay circuit. The RC delay circuit is electrically connected to the node between the second switch tube U6 and the third switch tube U7. The output terminal of the RC delay circuit is connected to the input terminal I of the third switch tube U7. The second switch tube U6 and the third switch tube U7 are turned on after receiving the level signal. The output terminal O of the third switch tube U7 is electrically connected to the timing unit 24. The input terminal of the timer U3 is electrically connected to the first sub-switch Q4 and the second sub-switch 232 respectively. The output terminal of the timer U3 is electrically connected to the third electronic switch Q2. After the second sub-switch 232 is turned on, the TRG pin of the 555 timer receives a low-level trigger signal of about 15us. At this time, the 555 timer starts working, and the output pin OUT of the 555 timer outputs a high-level signal of 2.5s. The base B of the third electronic switch Q2 is electrically connected to the output end of the 555 timer, the collector C of the third electronic switch Q2 is electrically connected to the power control end of the wireless module U2, and the emitter E of the third switch tube Q2 is connected to the load. When the base B of the third electronic switch Q2 receives a high-level signal of 2.5s output by the timer U3, it is turned on. After the timer U3 is turned on by the third electronic switch Q2, the PWR_ON / OFF signal of the wireless module U2 is pulled down for 2.5s, and then restored to a high level, so that the super capacitor C9 is discharged and the wireless module U2 is provided with a timing voltage through the timer U3, which is used to control the wireless module U2 to work under the timing voltage, thereby realizing the power-off timing requirements of the hard switch device when using the wireless module.

[0052] This embodiment can simply adjust the capacitance of super capacitor C9, the resistance of R4, and the capacitance of C11 to be compatible with various power-off timing requirements of wireless modules used in hard switch devices on the market, with low cost and high reliability. It can also be used for other modules that need to process power-off timing, not limited to wireless modules.

[0053] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0054] The above examples are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A wireless module power-off protection device for a hard switch device, the hard switch device comprising a voltage source circuit, the wireless module being electrically connected to the voltage source circuit; characterized in that: The wireless module power-off protection device is electrically connected between the voltage source circuit and the wireless module, and includes a first electronic switch, an energy storage unit, a second electronic switch, a timing unit, and a third electronic switch; the energy storage unit and the wireless module are electrically connected to the voltage source circuit through the first electronic switch, respectively; the energy storage unit is electrically connected to the wireless module through the second electronic switch, the timing unit, and the third electronic switch in sequence; wherein: When the hard switch device is powered on, the voltage source circuit outputs an operating voltage, the first electronic switch is turned on, the second electronic switch and the third electronic switch are turned off, and the energy storage unit and the timing unit are cut off respectively, so that the wireless module works at the voltage output by the voltage source circuit, and the energy storage unit is charged at the voltage output by the voltage source circuit; When the hard switch device loses power, the voltage source circuit stops outputting the operating voltage, the first electronic switch is disconnected, and the second and third electronic switches are turned on, so that the energy storage unit discharges and provides a timing voltage to the wireless module through a timer, which is used to control the wireless module to operate under the timing voltage.

2. The wireless module power-off protection device for hard switch equipment according to claim 1, characterized in that: The input end of the first electronic switch is electrically connected to the voltage source circuit, the output end of the first electronic switch is electrically connected to the energy storage unit and the wireless module respectively, and the first electronic switch is turned on at a high level and turned off at a low level.

3. The wireless module power-off protection device of the hard switch device according to claim 1, characterized in that: The second electronic switch includes a first sub-switch and a second sub-switch, the first input end of the first sub-switch is electrically connected to the voltage source circuit, the second input end of the first sub-switch is electrically connected to the energy storage unit, the output end of the first sub-switch is electrically connected to the timing unit, and the first sub-switch is turned on when the first input end is at a low level and the second input end is at a high level; the second input end of the second sub-switch is electrically connected to the energy storage unit, the output end of the second sub-switch is electrically connected to the timing unit, and the second sub-switch is turned on when the first input end is at a low level and the second input end is at a high level.

4. The wireless module power-off protection device for hard switch equipment according to claim 3, characterized in that: The second sub-switch includes a delay circuit, a first switch tube, a second switch tube, and a third switch tube. The first input end and the second input end of the first switch tube serve as the first input end and the second input end of the second sub-switch. The output end of the first switch tube is electrically connected to the input end of the second switch tube. The output end of the second switch tube is electrically connected to the input end of the third switch tube. The output end of the third switch tube serves as the output end of the second sub-switch. The delay circuit is electrically connected to a node between the second switch tube and the third switch tube, and is used to delay the electrical signal input to the timing unit.

5. The wireless module power-off protection device for hard switch equipment according to claim 4, characterized in that: When the voltage output by the third switch tube is at a low level, the timing unit works.

6. The wireless module power-off protection device of the hard switch device according to claim 5, characterized in that: When the voltage output by the third switch tube is at a low level, the timing unit works and a high level timing voltage is input to the timing unit.

7. The wireless module power-off protection device of the hard switch device according to claim 6, characterized in that: When the input end of the third electronic switch is electrically connected to the output end of the timing unit, the output end of the third electronic switch is electrically connected to the power switch of the wireless module, and the third electronic switch is turned on when the timing unit outputs a high-level timing voltage, and is used to control the wireless module to turn on or off.

8. The wireless module power-off protection device of the hard switch device according to claim 5, characterized in that: The timing unit is a 555 timer.

9. The wireless module power-off protection device of the hard switch device according to claim 4, characterized in that: The first sub-switch is a P-type field effect transistor, the first switch tube, the second switch tube, and the third switch tube are respectively a P-type field effect transistor, a transistor, and a transistor; the first electronic switch and the third electronic switch are respectively a P-type field effect transistor and an NPN-type triode.

10. A hard switch device, comprising a wireless module, a voltage source circuit and a wireless module power-off protection device of the hard switch device according to any one of claims 1 to 9.

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