CN101651335B - Electronic equipment protection device and electronic equipment - Google Patents

Abstract

The invention discloses an electronic equipment protection device and electronic equipment, which are used to solve the problem in the prior art that the electronic equipment cannot be cut off, and the electronic equipment can be resumed when the environmental parameters meet predetermined requirements. The device includes a first power conversion module (10), which is used to convert the external power supply voltage into the working voltage required by the control isolation circuit (40); when the control isolation circuit (40) outputs a predetermined alarm voltage to the sensor output pin, the The voltage output by the second power conversion module (30) in the electronic device is lower than the shutdown voltage of the second power conversion module (30), and when the output pin of the sensor is in an open-drain state, the output voltage is output to the second power conversion module (30). The voltage of the second power conversion module (30) is not lower than the shutdown voltage of the second power conversion module (30); the output voltage of the second power conversion module (30) is zero when the input voltage of the control isolation circuit (40) is lower than its own shutdown voltage, otherwise the external power supply The voltage is converted to the voltage required by the load in the electronic device.

Description

Electronic equipment protection devices and electronic equipment

technical field

The invention relates to the technical field of electronic circuits, in particular to an electronic equipment protection device and an electronic equipment.

Background technique

Computers, routers, switches and other electronic equipment sometimes cause the temperature of electronic equipment to be too high due to the failure of fans and other cooling ventilation devices in electronic equipment, which may shorten the life of components such as chips that have strict temperature requirements in electronic equipment. service life, and may even cause serious consequences of components being burned.

The prior art proposes an over-temperature protection scheme for electronic equipment to solve the above problems. The basic working principle of the existing over-temperature protection scheme is to place multiple temperature sensors on the ambient temperature collection point in the electronic equipment. When one of the temperature sensors detects that the temperature is higher than the set value, it will feed back information to the over-temperature protection control program running in the computer or other electronic equipment, and the over-temperature protection control program will issue a warning to the user. After the warning is issued, the scheduled When the user has not taken measures to reduce the temperature of the electronic equipment such as turning off the electronic equipment within a certain period of time, the over-temperature protection control program will execute the actions of storing data and cutting off the power supply to prevent possible adverse consequences caused by the continuous heating of the electronic equipment.

However, the above scheme has the following problems:

After the over-temperature protection control program running in the electronic equipment cuts off the power supply of the electronic equipment, although the purpose of lowering the temperature can be achieved, the control program running in the electronic equipment itself cannot run, and some temperature sensors also cannot It needs a power supply to work, and the temperature sensor in the existing scheme is usually powered by electronic equipment, so unless the electronic equipment is manually restarted later, the electronic equipment and the over-temperature protection control program running in the electronic equipment, Temperature sensors, etc. cannot automatically restart after the temperature drops within a predetermined range. For electronic devices such as routers and switches that need to work in an unattended environment for a long time, when it is necessary to shorten the service interruption time as much as possible, the above-mentioned over-temperature protection scheme will hardly meet the requirements.

In addition to the above-mentioned over-temperature protection scheme based on temperature sensors, electronic equipment protection schemes that rely on sensors that detect dust density, humidity, and other environmental parameters are similarly difficult to achieve without human intervention after the environmental parameters meet the predetermined requirements. Get electronics working again.

Contents of the invention

An embodiment of the present invention provides an electronic device protection device, which is used to solve the problem in the prior art that the electronic device cannot be restored to work when the environmental parameters meet predetermined requirements after the power supply of the electronic device is cut off.

The technical scheme that the embodiment of the present invention provides is as follows:

An electronic equipment protection device, comprising a first power conversion module (10) and a control isolation circuit (40), the control isolation circuit (40) being connected to the second power conversion module (30) in the electronic equipment, the The second power conversion module (30) is used to provide a working voltage for the load in the electronic equipment, wherein:

The first power conversion module (10), used for converting the voltage of the external power supply into the working voltage required by the control isolation circuit (40);

Control the isolation circuit (40), when the output pin of the environmental parameter sensor arranged on the electronic equipment outputs a predetermined alarm voltage, the voltage output to the second power conversion module (30) is lower than that of the second power conversion module (30) When the output pin of the environmental parameter sensor is in an open-drain state, the operating voltage provided by the first power conversion module (10) pulls up the voltage input from the output pin of the environmental parameter sensor to the control isolation circuit (40) , the voltage output to the second power conversion module (30) is not lower than the shutdown voltage of the second power conversion module (30), and the output pin of the environmental parameter sensor outputs a predetermined alarm when the detected value of the environmental parameter exceeds a predetermined value The voltage is in an open-drain state when the detected value of the environmental parameter does not exceed the predetermined value;

The second power conversion module (30), when the voltage input from the control isolation circuit (40) is lower than the shutdown voltage of the second power conversion module (30), the output voltage is zero, and when the input voltage from the control isolation circuit (40) When the voltage is not lower than the shut-off voltage of the second power conversion module (30), the voltage of the external power source is converted into the working voltage required by the load in the electronic equipment.

An electronic equipment protection device, comprising a first power conversion module (10), a logic device (70), and a control isolation circuit (40), the electronic equipment protection device and the second power conversion module (30) in the electronic equipment ) connection, the second power conversion module (30) is used to provide the working voltage for the load in the electronic equipment, wherein:

The first power conversion module (10), used for converting the voltage of the external power supply into the working voltage required by the control isolation circuit (40);

The logic device (70) receives the output voltage of at least one output pin of an environmental parameter sensor disposed on the electronic device, and the output pin of the environmental parameter sensor outputs a predetermined alarm voltage when the detected value of the environmental parameter exceeds a predetermined value, When the detection value of the environmental parameter does not exceed the predetermined value, it is in an open-drain state;

The logic device (70) outputs an alarm voltage when at least one environmental parameter sensor output pin outputs a predetermined alarm voltage, otherwise, there is no output voltage;

When the logic device (70) has no output voltage, the control isolation circuit (40) pulls up the voltage input by the logic device (70) through the operating voltage provided by the first power conversion module (10), and supplies the second power conversion module (30) The output voltage is not lower than the shutdown voltage of the second power conversion module (30), and when the logic device (70) outputs the alarm voltage, the output voltage to the second power conversion module (30) is lower than the second power conversion module (30) off voltage;

The second power conversion module (30), when the voltage input from the control isolation circuit (40) is lower than the shutdown voltage of the second power conversion module (30), the output voltage is zero, and when the input voltage from the control isolation circuit (40) When the voltage is not lower than the shut-off voltage of the second power conversion module (30), the voltage of the external power source is converted into the working voltage required by the load in the electronic equipment.

An electronic device includes a second power conversion module (30) and the electronic device protection device, the second power conversion module (30) is used to provide a working voltage for a load in the electronic device.

The first power conversion module in the electronic equipment protection device proposed by the embodiment of the present invention converts the voltage of the external power supply into the first voltage, and provides power for the control isolation circuit. When the environmental parameter sensor detects that the environmental parameter exceeds the predetermined range, the control isolation circuit , indicating that the second power conversion module does not provide working voltage to the electronic equipment; the control isolation circuit instructs the second power conversion module to convert the voltage provided by the external power supply into the work of the electronic equipment when the environmental parameter sensor detects that the environmental parameter returns to the predetermined range voltage and is supplied to the electronic equipment.

Description of drawings

FIG. 1 is a structural block diagram of an electronic equipment protection device proposed by an embodiment of the present invention;

Fig. 2 is the working principle block diagram of a kind of switching regulator power supply used in the embodiment of the present invention;

FIG. 3 is a circuit diagram of a control isolation circuit provided by an embodiment of the present invention;

FIG. 4 is a circuit diagram of another control isolation circuit provided by an embodiment of the present invention;

FIG. 5 is a structural block diagram of an electronic device provided by an embodiment of the present invention;

6 is a structural block diagram of an improved electronic device that can ensure the correct power-on sequence of components in the electronic device according to an embodiment of the present invention;

Fig. 7 is a structural block diagram of an electronic equipment protection device capable of monitoring multi-point environmental parameters provided by an embodiment of the present invention.

Detailed ways

Due to the existing electronic equipment protection scheme, when the sensor installed at the environmental parameter collection point in the electronic equipment detects that the current surrounding environmental parameters exceed the predetermined range, the protection program running in the electronic equipment usually cuts off the power supply to prevent environmental parameters from Continue to deteriorate, such as the temperature continues to rise, etc., in order to protect the components of electronic equipment from damage. However, the above solution has the problem that the electronic device cannot be restored to work after the environmental parameters of the electronic device are improved without human participation.

The embodiment of the present invention utilizes the conduction characteristics of the triode to add a control isolation circuit and a power conversion module between the external power supply and the electronic equipment. The control program in the device controls when to stop and resume power supply to the electronic device based on the feedback from the sensor.

In the following, an embodiment will be introduced in detail based on the above-mentioned inventive principles of the present invention to elaborate and describe the main realization principles of the method of the present invention in detail.

Please refer to FIG. 1 , which is a structural block diagram of an electronic equipment protection device proposed by an embodiment of the present invention. The device includes a first power conversion module 10 and an isolation control circuit 40, wherein the isolation control circuit 40 is connected to the second power conversion module 30 in the electronic device. The working voltage required by the load (including various components) in the existing electronic equipment is very different, and the voltage provided by the external power supply usually has a unified standard. For example, the voltage provided by the external power supply is usually 12v, so many The electronic equipment is equipped with a second power conversion module (30), which is used to convert the voltage input by the power plug of the electronic equipment into the working voltage required by the load in the electronic equipment, and provide it to the load in the electronic equipment.

The environmental parameter sensor 20 is placed on the temperature collection point in the electronic equipment, and the environmental parameter sensor is used to detect the environmental parameters such as temperature, humidity, gray density or specific gas concentration at the collection point. In this embodiment, the temperature sensor is taken as an example. There are many types of existing temperature sensors. In this embodiment, a temperature control chip with an output pin is selected as the temperature sensor. The row bus performs a write operation on the register of the temperature control chip to set a predetermined temperature range, and performs a read operation on the register of the temperature control chip through the serial bus to read the current temperature value detected by the temperature control chip. When the temperature control chip detects that the ambient temperature is within the predetermined temperature range, the output pin of the temperature control chip is in the OD gate open-drain output state, which can be equivalently regarded as being in a high-impedance state; When the ambient temperature exceeds the predetermined temperature range, the output pin of the temperature control chip outputs a lower predetermined alarm voltage, such as 0.3v.

The first power conversion module 10 is connected between the external power supply and the control isolation circuit 40 , and is used to convert the input voltage of the external power supply, such as a common 12v voltage, into a working voltage required by the control isolation circuit 40 , such as 3.3v voltage. In this embodiment, since the environmental parameter sensor 20 needs a voltage supply of 3v to 5.5v to work, the first power conversion module 10 is also used to connect the input terminal of the environmental parameter sensor 20 to convert the 12v voltage of the external power supply The required operating voltage 3.3v for the environmental parameter sensor 20, no matter whether the power supply provided for the load in the electronic equipment by the second voltage conversion module 30 is cut off like this, as long as the external power supply is normal, the environmental parameter sensor 20 can work without Like the prior art, after the power supply of the electronic equipment is cut off, the environmental parameter sensor 20 cannot work.

The control isolation circuit 40 has two input terminals, namely a first input terminal 401 and a second input terminal 402, wherein the first input terminal 401 is used to connect with the first power conversion module 10 to provide the control isolation circuit 40. Working voltage, the second input terminal 402 of the control isolation circuit 40 is connected to the output pin of the environmental parameter sensor 20, and the voltage input by the first input terminal 401 is used to output the pin when the environmental parameter sensor 20 detects that the temperature is within the normal range When in the open-drain state, pull up the voltage at the output pin of the environmental parameter sensor 20 (that is, at the second input terminal 402), and when the environmental parameter sensor 20 detects that the temperature is within the normal range, the voltage at the second input terminal 402 will It is between the voltage at the first input terminal 401 and a predetermined alarm voltage input when the environmental parameter sensor 20 detects that the temperature exceeds a normal range.

The control isolation circuit 40 is a comparison switch circuit. When a predetermined alarm voltage is input to the second input terminal 402 , for example, the predetermined alarm voltage may be 0.3v. The output voltage of the output terminal 403 is lower than the shut-off voltage of the second power conversion module 30, for example, 0.3v. Lower than the shutdown voltage of the second power conversion module 30 .

The second power conversion module 30 has an input pin 301, a feedback compensation pin 302 and an output pin 303, and is used to convert the voltage provided by the external power supply connected to the input pin 301 into a predetermined voltage under the control of the feedback compensation pin 302. An output voltage, the predetermined output voltage may be an operating voltage required by the electronic device. When an existing DC-DC power supply is used as the second power conversion module 30, the feedback compensation pin is a COMP (compensation) pin. The second power conversion module 30 does not perform voltage conversion processing when the input voltage of the feedback compensation pin 302 is lower than its own shutdown voltage, that is, the voltage conversion threshold value, for example, 0.3v, and the output pin has no output voltage or output voltage It is zero level, that is, cut off the power supply to the electronic equipment; when the input voltage of the feedback compensation pin is higher than the shutdown voltage, for example, 0.3v, the 12v voltage provided by the external power supply is converted into the work required by the electronic equipment The voltage is 1.2v, and the converted 1.2v voltage is provided to electronic equipment through the output pin. In this embodiment, the feedback compensation pin 302 of the second power conversion module 30 is connected to the output terminal 403 of the control isolation circuit 40 . The input pin 301 of the second power conversion module 30 is connected to an external power source.

The above-mentioned second power conversion module 30 can be implemented by an existing switching power supply. Please refer to FIG. 2 , which is a structural schematic diagram of an existing DC-DC power supply of a switching regulated power supply. The switching regulated power supply includes a DC-DC controller, two electronic switches, switch A and switch B, and a feedback control pin. When the switching regulated power supply is working, switch A or switch B is turned on or off periodically to generate a periodic square wave, and then the square wave is shaped and filtered by the inductor and capacitor to obtain a stable DC output voltage output from the output pin. . The COMP pin can be connected to the output pin to monitor the output voltage, and the DC-DC controller adjusts the switching time of switch A and switch B through the feedback signal of the COMP pin to determine the output voltage and ensure the stability of the output voltage. When the input voltage of the COMP pin is lower than a predetermined value, no voltage conversion process is performed, and there is no output voltage.

In the accompanying drawing 1, the second power conversion module 30 of the previous stage should select a switching power supply with higher conversion efficiency to avoid excessive conversion loss.

The functions of the above-mentioned control isolation circuit 40 can be realized by a single-chip microcomputer, or can be realized by a circuit with the following structure.

circuit one

Please refer to accompanying drawing 3, the resistor R2 is connected between the first input terminal 401 of the control isolation circuit 40 and the second input terminal 402 of the control isolation circuit 40;

The second input terminal 402 is connected to the base of the transistor Q1 through the resistor R1;

The collector of the transistor Q1 is connected to the second input terminal 402 through the resistor R3, the collector of the transistor Q1 is connected to the base of the transistor Q2 through the resistor R4, and the emitter of the transistor Q1 is grounded;

The collector of the transistor Q2 is connected to the output terminal 403, and the emitter is grounded.

circuit two

Please refer to accompanying drawing 4, in order to ensure the stability of the input voltage of the first input terminal 401 in accompanying drawing 3, a grounded filter capacitor C can also be connected with the first input terminal 401.

In order to facilitate subsequent testing of the control isolation circuit 40, the collector of the triode Q2 can also be connected to the output terminal 403 through the resistor R5. The output terminal 403 of the control isolation circuit 40 can be connected.

When the environmental parameter sensor 20 detects that the temperature value is within the normal range, the output pin of the environmental parameter sensor 20 is in an open-drain state, and the second input terminal 402 of the control isolation circuit 40 connected to the output pin of the environmental parameter sensor 20 The voltage is pulled up by the voltage at the _first input terminal ₄₀₁ , and the base of the transistor Q1 is also at a high level in FIG. is pulled low, so that the base voltage of the transistor Q2 is pulled low, so that V _be < V _on , the transistor Q2 is in an off state, so the collector of the transistor Q2 connected to the output terminal 403 of the control isolation circuit 40 is at a high voltage Level, the input voltage of the second power conversion module 30 connected to the output terminal 403 of the control isolation circuit 40 at the feedback compensation pin is higher than its own shutdown voltage, so the second power conversion module 30 converts the 12v voltage provided by the external power supply into electronic The working voltage required by the device is 1.2v. The output pin of the environmental parameter sensor 20 is in an open-drain state, and when the voltage at the second input terminal 402 is pulled up by the voltage input at the first input terminal 401, the voltage at the second input terminal 402 should be higher than the conduction voltage of the transistor Q1 .

When the environmental parameter sensor 20 detects that the temperature value exceeds the normal range, the output pin of the environmental parameter sensor 20 outputs a predetermined alarm voltage, which is an alarm voltage 0.3v in this embodiment. The voltage of the second input terminal 402 of the control isolation circuit 40 is also pulled down, the alarm voltage should be lower than the conduction voltage of the triode Q1, and the base of the triode Q1 in the accompanying drawing 3 is also at a low level, so that B1 _be < V1 _on , so that the transistor Q1 is in the off state, the voltage of the collector of the transistor Q1 is pulled up, so that the base voltage of the transistor Q2 is correspondingly pulled up, so that V2 _be >V2 _on , and the transistor Q2 is in the conduction state, so The collector of the transistor Q2 connected to the output terminal 403 of the control isolation circuit 40 is at a low level. At this time, the input voltage of the feedback compensation pin of the second power conversion module 30 connected to the output terminal 403 of the control isolation circuit 40 is lower than Its own shutdown voltage, so the second power conversion module 30 no longer performs voltage conversion processing, and cuts off the 1.2v working voltage provided to the electronic equipment.

The electronic equipment protection device shown in Figure 1 can be designed as a module independent of the electronic equipment, connected with the electronic equipment to be protected through the connection method shown in Figure 1; it can also be used as a functional module in the electronic equipment, That is, an electronic device with a protection function, please refer to the accompanying drawing 5.

Different chips and components in electronic equipment require different working voltages. For example, some components need 5v working voltage, while other components need 3.3v, 2.5v, 1.8v or 1.2v working voltage, and different working voltages There is a power-on sequence requirement between components. For example, components with a working voltage of 1.2v need to be powered on before components with other working voltages, so 1.2v can be used as the second-level voltage, and other voltages can be controlled by 1.2v. The second-level voltage of v is obtained through subsequent transformation by the voltage conversion module as the third-level voltage, the fourth-level voltage, and the like. Please refer to accompanying drawing 6, the electronic equipment with protection function provided by this embodiment can also include a second-level circuit, the second-level circuit includes a control isolation circuit 50 and a third power conversion module 60, and the control isolation circuit 50 is used for Whether the third power conversion module 60 converts the voltage of the external power supply to the third-level voltage is controlled according to the second-level voltage converted by the second power conversion module 30 in FIG. 5 . The structure and function of the control isolation circuit 50 is similar to that of the control isolation circuit 40 in FIG. 1 or FIG. connected to the output.

Similarly, there may also be a third-level circuit and a fourth-level circuit, wherein the control isolation circuit in each level circuit controls whether the power conversion module of this level will The voltage of the external power supply is converted into the fourth-level voltage or the fifth-level voltage, which will not be described in detail here.

The above solution can ensure the correct power-on sequence of each component in the electronic device, and avoid damage to the components in the electronic device due to improper power-on and power-off sequence.

Preferably, the electronic equipment protection device in accompanying drawing 1 can also have the following extension scheme, please refer to accompanying drawing 7, can install environmental parameter sensor 201～environmental parameter sensor 209 at a plurality of environmental parameter collecting points of electronic equipment, environment Parameter sensor 201～environmental parameter sensor 209, the signals of the output pins of a plurality of environmental parameter sensors are input into the logic device 70 to perform "AND" operation, and the output signal of the logic device 70 is connected to the second input end of the control isolation circuit , since the predetermined alarm voltage output by the environmental parameter sensor is low level, which is expressed as "0" in numbers, so as long as one of the environmental parameter sensors detects the temperature or other environmental parameter detection values of the collection point where the environmental parameter sensor is placed If the predetermined range is exceeded, a low level will be output after the "AND" operation of the logic device 70, so as to cut off the working power provided for the electronic equipment and realize the purpose of protection. Electronic equipment can obtain working power only when the environmental parameters of all collection points meet the predetermined requirements.

The extended scheme in Fig. 7 can be used in combination with the scheme in Fig. 6 .

The electronic device protection device proposed by the embodiment of the present invention has a simple structure, and the environmental parameter sensor and a small number of triodes will not consume too much electric energy and will not significantly affect the temperature around the electronic device.

The embodiment of the present invention proposes an electronic equipment protection device independent of electronic equipment. The first power conversion module in the device converts the voltage of the external power supply to the first voltage, provides power for the environmental parameter sensor and the control isolation circuit, and controls the isolation circuit. When the environmental parameter sensor detects that the environmental parameter exceeds the predetermined range, it instructs the second power conversion module not to provide the operating voltage to the electronic device; when the environmental parameter sensor detects that the environmental parameter is within the predetermined range, the control isolation circuit instructs the second power conversion module to The voltage provided by the external power supply is converted into the operating voltage of the electronic equipment and supplied to the electronic equipment.

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 equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (11)

1. electronic equipment protection device; it is characterized in that; comprise the first power conversion module (10) and control buffer circuit (40); described control buffer circuit (40) is connected with second source conversion module (30) in the described electronic equipment; described second source conversion module (30) is used to the load in the described electronic equipment that operating voltage is provided, wherein:

The first power conversion module (10) is used for the voltage transformation of external power source is the required operating voltage of control buffer circuit (40);

Control buffer circuit (40), when alarm voltage is scheduled in the environmental parameter transducer output pin output on being placed in described electronic equipment, be lower than the voltage of closing of second source conversion module (30) to the voltage of second source conversion module (30) output, when described environmental parameter transducer output pin is in out the leakage state, draw high the voltage of environmental parameter transducer output pin by the operating voltage that the first power conversion module (10) provides to control buffer circuit (40) input, be not less than the voltage of closing of second source conversion module (30) to the voltage of second source conversion module (30) output, the predetermined alarm of output voltage was in out the leakage state when output pin of described environmental parameter transducer surpassed predetermined value at the detected value of environmental parameter when the detected value of environmental parameter does not surpass predetermined value;

Second source conversion module (30), from control buffer circuit (40) input voltage be lower than second source conversion module (30) close voltage the time, output voltage is zero, the voltage from control buffer circuit (40) input be not less than second source conversion module (30) close voltage the time, be the required operating voltage of load in the electronic equipment with the voltage transformation of external power source.

2. device as claimed in claim 1, it is characterized in that, when the environmental parameter transducer needs working power, the described first power conversion module (10) also is used for the input voltage of external power source is transformed to the required operating voltage of environmental parameter transducer, and the voltage after the conversion is offered the environmental parameter transducer.

3. device as claimed in claim 1 is characterized in that, described control buffer circuit (40) comprising:

Resistance R 2 is connected the first input end (401) that is used to receive the voltage after first power conversion module (10) conversion and is used to receive between second input (402) of described environmental parameter transducer output pin output voltage;

Resistance R 1 is connected between the base stage of described second input (402) and triode Q1;

Triode Q1, its collector electrode is connected with described first input end (401) by resistance R 3, and the collector electrode of triode Q1 is connected the grounded emitter of triode Q1 by resistance R 4 with the base stage of triode Q2;

Triode Q2, its collector electrode is connected grounded emitter with the output (403) that is used for to second source conversion module (30) output voltage;

The described predetermined alarm voltage of described environmental parameter transducer output pin output is lower than the conducting voltage of triode Q1, when described environmental parameter transducer output pin was in out the leakage state, the voltage that second input (402) is located was not less than the conducting voltage of triode Q1;

The operating voltage of described first input end (401) input is greater than the conducting voltage of triode Q2;

During triode Q2 conducting, the voltage of control buffer circuit (40) output (403) output is lower than the voltage of closing of second source conversion module (30), when triode Q2 turn-offed, the voltage of control buffer circuit (40) output (403) output was not less than the voltage of closing of second source conversion module (30).

4. device as claimed in claim 3 is characterized in that, the first input end (401) of described control buffer circuit (40) is by filter capacitor ground connection.

5. device as claimed in claim 3 is characterized in that, in the described control buffer circuit (40), the collector electrode of triode Q2 is connected with output (403) by resistance R 5.

6. device as claimed in claim 1 is characterized in that, the described first power conversion module (10) is a linear voltage regulator.

7. device as claimed in claim 1 is characterized in that, described second source conversion module (30) is a switching power supply.

8. electronic equipment protection device; it is characterized in that; comprise the first power conversion module (10), logical device (70), control buffer circuit (40); described electronic equipment protection device is connected with second source conversion module (30) in the described electronic equipment; described second source conversion module (30) is used to the load in the described electronic equipment that operating voltage is provided, wherein:

The first power conversion module (10) is used for the voltage transformation of external power source is the required operating voltage of control buffer circuit (40);

Logical device (70) receives at least one output voltage that is placed in the environmental parameter transducer output pin on the described electronic equipment, the predetermined alarm of output voltage was in out the leakage state when output pin of described environmental parameter transducer surpassed predetermined value at the detected value of environmental parameter when the detected value of environmental parameter does not surpass predetermined value;

Logical device (70) when having the predetermined alarm of environmental parameter transducer output pin output voltage at least, outputting alarm voltage, otherwise, no-output voltage;

Control buffer circuit (40) is when logical device (70) no-output voltage, draw high the voltage of logical device (70) input by the operating voltage that the first power conversion module (10) provides, be not less than the voltage of closing of second source conversion module (30) to the voltage of second source conversion module (30) output, when the described alarm voltage of logical device (70) output, be lower than the voltage of closing of second source conversion module (30) to the voltage of second source conversion module (30) output;

Second source conversion module (30), from control buffer circuit (40) input voltage be lower than second source conversion module (30) close voltage the time, output voltage is zero, the voltage from control buffer circuit (40) input be not less than second source conversion module (30) close voltage the time, be the required operating voltage of load in the electronic equipment with the voltage transformation of external power source.

9. an electronic equipment is characterized in that, comprises second source conversion module (30) and as the arbitrary described electronic equipment protection device of claim 1～8, described second source conversion module (30) is used to the load in the described electronic equipment that operating voltage is provided.

10. electronic equipment as claimed in claim 9 is characterized in that, the required operating voltage of the load in the described electronic equipment is to need the required second level predetermined voltage of components and parts that powers at first in the described electronic equipment.

11. electronic equipment as claimed in claim 10, it is characterized in that, also comprise the second control buffer circuit (50), the 3rd power conversion module (60), described the 3rd power conversion module (60) is used to the components and parts that need power on after the described components and parts that power at first power in the described electronic equipment that third level predetermined voltage is provided, wherein:

The second control buffer circuit (50) is when second source conversion module (30) output voltage is zero, be lower than the voltage of closing of the 3rd power conversion module (60) to the voltage of the 3rd power conversion module (60) output, when the predetermined voltage of the described second level of second source conversion module (30) output, be not less than the voltage of closing of the 3rd power conversion module (60) to the voltage of the 3rd power conversion module (60) output;

The 3rd power conversion module (60), from second control buffer circuit (50) input voltage be lower than the 3rd power conversion module (60) close voltage the time, output voltage is zero, the voltage from second control buffer circuit (50) input be not less than the 3rd power conversion module (60) close voltage the time, be the required third level predetermined voltage of load in the electronic equipment with the voltage transformation of external power source.

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