CN204706877U - The protective circuit of a kind of head mounted display and electronic equipment - Google Patents
The protective circuit of a kind of head mounted display and electronic equipment Download PDFInfo
- Publication number
- CN204706877U CN204706877U CN201520259939.XU CN201520259939U CN204706877U CN 204706877 U CN204706877 U CN 204706877U CN 201520259939 U CN201520259939 U CN 201520259939U CN 204706877 U CN204706877 U CN 204706877U
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- resistance
- electronic equipment
- diode
- protective circuit
- mcu chip
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Abstract
The utility model discloses the protective circuit of a kind of head mounted display and electronic equipment, this protective circuit comprises: the positive pole of the first diode D1 is connected with one end of the first resistance R1; The negative pole of the first diode D1 is connected with one end of the negative pole of the second diode D2 and the 3rd resistance R3; The other end of the first resistance R1 is connected with one end of the second resistance R2; The other end of the second resistance R2 and the equal ground connection of the other end of the 3rd resistance R3; Wherein, the first diode D1 has specific leakage current characteristic.The technical scheme that the utility model provides, by optimizing the selection of diode, achieve the automatic protection of electronic equipment, without the need to additional wires, framework is simple, cost is low, and exploitativeness is strong.This scheme is applied to head-mounted display apparatus, protects equipment and user further, eliminate safe hidden trouble, meet the user demand of head-mounted display apparatus.
Description
Technical field
The utility model relates to visual device technical field, particularly relates to the protective circuit of a kind of head mounted display and electronic equipment.
Background technology
In order to protect the consumer of electronic equipment and use electronic equipment; the protective circuit application of electronic equipment is wider; the situation that protective circuit causes temperature anomaly to rise mainly for electronic equipment due to the circuit abnormality such as short circuit or open circuit, controls electronic equipment auto-breaking when temperature rises to preset value.In prior art; the protective circuit often serviceability temperature protect IC of electronic equipment; but because temperature protection chip price is higher, and can increase the framework complexity of protective circuit entirety, there is the defects such as cost high and exploitativeness difference in the existing scheme realizing the protective circuit of electronic equipment.
Utility model content
In view of the above problems, the utility model provides the protective circuit of a kind of head mounted display and electronic equipment, to solve the problem or to solve the problem at least in part.
According to an aspect of the present utility model, provide a kind of protective circuit of electronic equipment, this protective circuit comprises: the first diode D1, the second diode D2, the first resistance R1, the second resistance R2 and the 3rd resistance R3;
The positive pole of the first diode D1 is connected with one end of the first resistance R1;
The negative pole of the first diode D1 is connected with one end of the negative pole of the second diode D2 and the 3rd resistance R3;
The other end of the first resistance R1 is connected with one end of the second resistance R2;
The other end of the second resistance R2 and the equal ground connection of the other end of the 3rd resistance R3;
The public connecting end of the first diode D1 and the first resistance R1 as the first port, for being connected with the power button input of electronic equipment;
The public connecting end of the first diode D1, the second diode D2 and the 3rd resistance R3 is as the second port, and the Enable Pin for the power supply chip of the MCU chip with electronic equipment is connected;
The positive pole of the second diode D2 is as the 3rd port, and the I/O port for the MCU chip with electronic equipment is connected;
The public connecting end of the first resistance R1 and the second resistance R2 is as the 4th port, and the detecting mouth for the MCU chip with electronic equipment is connected; The MCU chip of electronic equipment performs protection operation after its detecting mouth receives the signal being not less than response lag;
Wherein, the leakage current that the first diode D1 produces raises with temperature and increases, and when preset temperature T, leakage current is I
t, I
t× R2 is more than or equal to the response lag of the detecting mouth of the MCU chip of electronic equipment.
Alternatively, the MCU chip of electronic equipment performs power-off operation after its detecting mouth receives the signal being not less than response lag.
Alternatively, the MCU chip of electronic equipment performs alarm operation after its detecting mouth receives the signal being not less than response lag.
Alternatively, this protective circuit comprises further: electric capacity C1;
One end of electric capacity C1 is connected with the public connecting end of the first diode D1, the second diode D2 and the 3rd resistance R3; The other end ground connection of electric capacity C1.
Alternatively, the detecting mouth of the MCU chip of electronic equipment comprises: the device in the pin of MCU chip or MCU chip.
Alternatively, the first resistance R1 and the second resistance R2 meets following condition:
the response lag of the detecting mouth of the MCU chip of electronic equipment is more than or equal to the product of supply voltage.
According to another aspect of the present utility model, provide a kind of head mounted display, this head mounted display comprises the protective circuit of the electronic equipment as above described in any one, and this protective circuit realizes the circuit protection operation of head mounted display.
From the above; the utility model is higher for the temperature protection chip price existed in prior art, framework is complicated, high in cost of production defect; propose a kind of circuit protection scheme; on the basis of circuit realizing auto-lock function; by optimizing the selection of diode, the automatic protection of MCU chip when furthermore achieved that after circuit abnormal situation temperature rises to preset value, without the need to additional wires; framework is simple, cost is low, and exploitativeness is strong.This scheme is applied to head-mounted display apparatus, protects equipment and user further, eliminate safe hidden trouble, meet the user demand of head-mounted display apparatus.
Accompanying drawing explanation
Fig. 1 shows the circuit diagram of the protective circuit of a kind of electronic equipment according to the utility model embodiment;
Fig. 2 shows the leakage current characteristic figure of a kind of diode according to the utility model embodiment;
Fig. 3 shows the schematic diagram of a kind of head mounted display according to the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
Fig. 1 shows the circuit diagram of the protective circuit of a kind of electronic equipment according to the utility model embodiment.As shown in Figure 1, this protective circuit comprises: the first diode D1, the second diode D2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and electric capacity C1.
The positive pole of the first diode D1 is connected with one end of the first resistance R1; The negative pole of the first diode D1 is connected with the negative pole of the second diode D2, one end of the 3rd resistance R3 and one end of electric capacity C1; The other end of the first resistance R1 is connected with one end of the second resistance R2; The other end of the second resistance R2, the equal ground connection of the other end of the 3rd resistance R3 and electric capacity C1.
In the present embodiment, the public connecting end of the first diode D1 and the first resistance R1 as the first port P1, for being connected with the power button input of electronic equipment; Wherein, the first port P1 is used for being connected with the power button input of electronic equipment referring to: the first port P1 is used for being connected with one end of the power button of electronic equipment, and the other end of power button is connected with power supply; When power button is pressed, the first port P1 voltage uprises, when power button is upspring, and the first port P1 voltage step-down.The public connecting end of the first diode D1, the second diode D2, the 3rd resistance R3 and electric capacity C1 is as the second port P2, and the Enable Pin for the power supply chip of the MCU chip with electronic equipment is connected; Wherein, the Enable Pin voltage of the power supply chip of the MCU chip of electronic equipment is defaulted as low, and when the Enable Pin voltage of this power supply chip uprises, power supply chip is powered to MCU.The positive pole of the second diode D2 is as the 3rd port P3, and the I/O port for the MCU chip with electronic equipment is connected; Wherein, the I/O port of this MCU chip exports high level after MCU chip powers on.The public connecting end of the first resistance R1 and the second resistance R2 is as the 4th port P4, and the detecting mouth for the MCU chip with electronic equipment is connected; Wherein, the detecting mouth of the MCU chip of electronic equipment refers to the device in the pin of MCU chip or MCU chip, the MCU chip of electronic equipment performs protection operation after its detecting mouth receives the signal being not less than response lag, particularly, in the present embodiment, the MCU chip of electronic equipment performs power-off operation after its detecting mouth receives the signal being not less than response lag; In other embodiments of the present utility model, the MCU chip of electronic equipment can also perform alarm operation after its detecting mouth receives the signal being not less than response lag.
Fig. 2 shows the leakage current characteristic figure of a kind of diode according to the utility model embodiment, as shown in Figure 2, abscissa represents applying reverse voltage on the diode, ordinate represents the leakage current of diode, when reverse voltage is constant, the leakage current of diode raises with temperature and increases.Utilize the leakage current characteristic of this diode, choose the diode with suitable leakage current characteristic, as the first diode D1 in the protective circuit shown in Fig. 1.Meet the following conditions: leakage current raises with temperature and increases, and when preset temperature T, leakage current is I
t, I
t× R2 is more than or equal to the response lag of the detecting mouth of the MCU chip of electronic equipment.Wherein, as can be seen from the circuit diagram shown in Fig. 1, under electronic equipment normal operating conditions, the reverse voltage applied on the first diode D1 is substantially constant, therefore in the present embodiment without the need to considering reverse voltage, only pay close attention to the leakage current of the first diode D1 and the relation of temperature.
Based on foregoing circuit element and annexation thereof, the operation principle of the protective circuit of the electronic equipment shown in Fig. 1 is as follows:
When the power button of electronic equipment is pressed, first port P1 voltage uprises, through the first diode D1 and the 3rd resistance R3, second port P2 voltage is uprised, the Enable Pin voltage of the power supply chip of the MCU chip of electronic equipment uprises, power supply chip is powered to MCU chip, after MCU chip powers on, I/O port exports high level, 3rd port P3 voltage is uprised, through the second diode D2 and the 3rd resistance R3, the high level of the 3rd port P3 makes the second port P2 can keep high level when power button is upspring, thus reach the object continuing to power to MCU chip, and then make electronic equipment keep normal operating conditions, namely auto-lock function is achieved, when the power button of electronic equipment is pressed again, the first port P1 voltage uprises, and the 4th port P4 voltage is also uprised, and causes the detecting mouth voltage of the MCU chip of electronic equipment also to uprise.Now, the pass of the voltage of the 4th port P4 and the voltage of the first port P1 is:
wherein, when power button is pressed, the magnitude of voltage of the first port P1 equals supply voltage; Visible, the first resistance R1 and the second resistance R2 is divider resistance, by the distribution regulating the value of the first resistance R1 and the second resistance R2 can control the voltage of the 4th port P4, if the response lag of the detecting mouth of MCU chip is V
th, make V by regulating the value of the first resistance R1 and the second resistance R2
p4>=V
th, then the MCU chip of electronic equipment performs power-off operation after its detecting mouth receives this high voltage, and then electronic equipment is quit work.It should be noted that, the detection of the MCU chip of electronic equipment to the signal received by its detecting mouth is made to have certain delay through arranging in the present embodiment, be carry out under the normal operating conditions of electronic equipment, therefore in previously described power-on operation, do not relate to the detection of the detecting mouth to MCU chip.
Further, in the operating state of electronic equipment, if circuit is short-circuited or the unusual condition such as open circuit, user often cannot learn thus not by controlling the power button of electronic equipment to carry out power-off operation, now, the protective circuit of the electronic equipment shown in Fig. 1 is by following implementation Process circuit protection: because circuit abnormality often causes the exception of temperature to rise, when the temperature increases, the leakage current of the first diode D1 in the protective circuit of the electronic equipment shown in Fig. 1 can raise with temperature and increase, when temperature is elevated to preset temperature T, the leakage current of the first diode D1 is I
t, this leakage current I
tflow through the first resistance R1 and the second resistance R2, the voltage of the 4th port becomes: V
p4=I
t× R2, is met by the leakage current of the first diode D1 selected in known the present embodiment above: I
t× R2>=V
thnamely now the voltage of the 4th port P4 is more than or equal to the response lag of the detecting mouth of the MCU chip of electronic equipment, when the MCU chip of electronic equipment detects this signal, perform the power-off operation of MCU chip, 3rd port P3 voltage step-down, make the second port P2 voltage step-down, power supply chip is stopped power supply, and finally causes electronic equipment to quit work.
Fig. 3 shows the schematic diagram of a kind of head mounted display according to the utility model embodiment; as shown in Figure 3; this head mounted display 300 comprises the protective circuit 310 of electronic equipment; the protective circuit of the protective circuit 310 of this electronic equipment as above electronic equipment shown in texts and pictures 1, for realizing the circuit protection operation of head mounted display 300.Visible; head mounted display shown in Fig. 3 is by the selection of optimization first diode; realize on the basis of the circuit of auto-lock function, furthermore achieved that the automatic protection of MCU chip after circuit abnormal situation in head mounted display, namely achieve the automatic protection of head-mounted display.This programme is without the need to additional wires, and framework is simple, cost is low, and exploitativeness is strong.
In sum; the utility model is higher for the temperature protection chip price existed in prior art, framework is complicated, high in cost of production defect; propose a kind of circuit protection scheme; on the basis of circuit realizing auto-lock function; by optimizing the selection of diode, the auto-breaking of MCU chip when furthermore achieved that after circuit abnormal situation temperature rises to preset value, without the need to additional wires; framework is simple, cost is low, and exploitativeness is strong.This scheme is applied to head-mounted display apparatus, protects equipment and user further, eliminate safe hidden trouble, meet the user demand of head-mounted display apparatus.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection range of the present utility model.
Claims (7)
1. a protective circuit for electronic equipment, is characterized in that, this protective circuit comprises: the first diode D1, the second diode D2, the first resistance R1, the second resistance R2 and the 3rd resistance R3;
The positive pole of the first diode D1 is connected with one end of the first resistance R1;
The negative pole of the first diode D1 is connected with one end of the negative pole of the second diode D2 and the 3rd resistance R3;
The other end of the first resistance R1 is connected with one end of the second resistance R2;
The other end of the second resistance R2 and the equal ground connection of the other end of the 3rd resistance R3;
The public connecting end of the first diode D1 and the first resistance R1 as the first port, for being connected with the power button input of electronic equipment;
The public connecting end of the first diode D1, the second diode D2 and the 3rd resistance R3 is as the second port, and the Enable Pin for the power supply chip of the MCU chip with electronic equipment is connected;
The positive pole of the second diode D2 is as the 3rd port, and the I/O port for the MCU chip with electronic equipment is connected;
The public connecting end of the first resistance R1 and the second resistance R2 is as the 4th port, and the detecting mouth for the MCU chip with electronic equipment is connected; The MCU chip of electronic equipment performs protection operation after its detecting mouth receives the signal being not less than response lag;
Wherein, the leakage current that the first diode D1 produces raises with temperature and increases, and when preset temperature T, leakage current is I
t, I
t× R2 is more than or equal to the response lag of the detecting mouth of the MCU chip of electronic equipment.
2. protective circuit as claimed in claim 1, is characterized in that, the MCU chip of electronic equipment performs power-off operation after its detecting mouth receives the signal being not less than response lag.
3. protective circuit as claimed in claim 1, is characterized in that, the MCU chip of electronic equipment performs alarm operation after its detecting mouth receives the signal being not less than response lag.
4. protective circuit as claimed in claim 2 or claim 3, it is characterized in that, this protective circuit comprises further: electric capacity C1;
One end of electric capacity C1 is connected with the public connecting end of the first diode D1, the second diode D2 and the 3rd resistance R3; The other end ground connection of electric capacity C1.
5. protective circuit as claimed in claim 4, it is characterized in that, the detecting mouth of the MCU chip of electronic equipment comprises: the device in the pin of MCU chip or MCU chip.
6. protective circuit as claimed in claim 5, it is characterized in that, the first resistance R1 and the second resistance R2 meets following condition:
the response lag of the detecting mouth of the MCU chip of electronic equipment is more than or equal to the product of supply voltage.
7. a head mounted display, is characterized in that, this head mounted display comprises the protective circuit of the electronic equipment according to any one of claim 1-6, and this protective circuit realizes the circuit protection operation of head mounted display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520259939.XU CN204706877U (en) | 2015-04-24 | 2015-04-24 | The protective circuit of a kind of head mounted display and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520259939.XU CN204706877U (en) | 2015-04-24 | 2015-04-24 | The protective circuit of a kind of head mounted display and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204706877U true CN204706877U (en) | 2015-10-14 |
Family
ID=54286471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520259939.XU Withdrawn - After Issue CN204706877U (en) | 2015-04-24 | 2015-04-24 | The protective circuit of a kind of head mounted display and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204706877U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917156A (en) * | 2015-04-24 | 2015-09-16 | 北京小鸟看看科技有限公司 | Head-mounted display, protective circuit of electronic equipment and circuit protection method |
-
2015
- 2015-04-24 CN CN201520259939.XU patent/CN204706877U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917156A (en) * | 2015-04-24 | 2015-09-16 | 北京小鸟看看科技有限公司 | Head-mounted display, protective circuit of electronic equipment and circuit protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151014 Effective date of abandoning: 20171208 |