IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0884207
(2010-09-17)
|
등록번호 |
US-8508377
(2013-08-13)
|
우선권정보 |
TW-99121177 A (2010-06-29) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Hon Hai Precision Industry Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
8 |
초록
▼
A monitoring circuit includes a first detecting unit, a second detecting unit, a comparing unit and an indicating unit. The first detecting unit is configured for detecting a temperature of a vehicular lamp and sending out a first signal. The second detecting unit is configured for detecting the sur
A monitoring circuit includes a first detecting unit, a second detecting unit, a comparing unit and an indicating unit. The first detecting unit is configured for detecting a temperature of a vehicular lamp and sending out a first signal. The second detecting unit is configured for detecting the surrounding temperature and sending out a second signal. The comparing unit is configured for comparing the first signal with the second signal, and controls the indicating unit to show the state of the vehicular lamp according to the compared result. When the first signal is higher than the second signal, the comparing unit controls the indicating unit to show that the vehicular lamp is unlit. When the first signal is equal to or lower than the second signal, the comparing unit controls the indicating unit to show that the vehicular lamp is lit.
대표청구항
▼
1. A monitoring circuit for a vehicular lamp, comprising: a first detecting unit configured for detecting a temperature of the vehicular lamp and sending out a first signal representing the temperature of the vehicular lamp;a second detecting unit configured for detecting an environmental temperatur
1. A monitoring circuit for a vehicular lamp, comprising: a first detecting unit configured for detecting a temperature of the vehicular lamp and sending out a first signal representing the temperature of the vehicular lamp;a second detecting unit configured for detecting an environmental temperature and sending out a second signal representing the environmental temperature;a comparing unit configured for receiving the first and second signals, comparing the first signal with the second signal, and sending out a control signal according to the compared result; andan indicating unit configured for showing the state of the vehicular lamp according to the control signal; whereinwhen the first signal is higher than the second signal, the comparing unit controls the indicating unit to show that the vehicular lamp is unlit; andwhen the first signal is equal to or lower than the second signal, the comparing unit controls the indicating unit to show that the vehicular lamp is lit. 2. The monitoring circuit of claim 1, wherein the first detecting unit comprises a first resistor, a first thermo sensitive resistor and a first output terminal, one end of the first resistor is configured for being connected to a power supply, the other end of the first resistor is connected to one end of the first thermo sensitive resistor, the other end of the first thermo sensitive resistor is grounded, the first thermo sensitive resistor is configured for being set in the vehicular lamp, the first output terminal connects a first node between the first resistor and the first thermo sensitive resistor to the comparing unit. 3. The monitoring circuit of claim 2, wherein the second detecting unit comprises a second resistor, a second thermo sensitive resistor and a second output terminal, one end of the second resistor is configured for being connected to the power supply, the other end of the second resistor is connected to one end of the second thermo sensitive resistor, the other end of the second thermo sensitive resistor is grounded, the second thermo sensitive resistor is configured for being set away from the vehicular lamp, the second output terminal connects a second node between the second resistor and the second thermo sensitive resistor to the comparing unit. 4. The monitoring circuit of claim 3, wherein the resistance value of the second resistor is larger than the resistance value of the first resistor. 5. The monitoring circuit of claim 3, wherein the resistance value of the first thermo sensitive resistor is the same as the resistance value of the second thermo sensitive resistor when the first thermo sensitive resistor and the second thermo sensitive resistor suffer the same temperature. 6. The monitoring circuit of claim 3, wherein the resistance values of the first thermo sensitive resistor and the second thermo sensitive resistor decrease when temperature increases. 7. The monitoring circuit of claim 6, wherein the comparing unit is an operational amplifier, and comprises a power terminal, a grounding terminal, a positive input terminal, a negative input terminal and an output terminal, the power terminal is configured for being connected to the power supply, the grounding terminal is grounded, the positive input terminal is connected to the first output terminal, the negative input terminal is connected to the second output terminal, the comparing unit compares the first signal inputted from the positive input terminal and the second signal inputted from the negative input terminal, when the first signal is larger than the second signal, the output terminal outputs a high level signal, and when the first signal is lower than or equal to the second signal, the output terminal outputs a low level signal. 8. The monitoring circuit of claim 7, wherein the indicating unit comprises a light-emitting diode and an third resistor, the anode of the light-emitting diode is configured for being connected to the power supply through the third resistor, and the cathode of the light-emitting diode is connected to the output terminal of the comparing unit.
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