CN202916628U - Signal distribution and isolation circuit applied to infrared signal standby control - Google Patents
Signal distribution and isolation circuit applied to infrared signal standby control Download PDFInfo
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- CN202916628U CN202916628U CN 201220573645 CN201220573645U CN202916628U CN 202916628 U CN202916628 U CN 202916628U CN 201220573645 CN201220573645 CN 201220573645 CN 201220573645 U CN201220573645 U CN 201220573645U CN 202916628 U CN202916628 U CN 202916628U
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Abstract
The present utility model relates to a signal distribution and isolation circuit applied to infrared signal standby control. The signal distribution and isolation circuit applied to infrared signal standby control is provided with a diode D1, a resistor R1 and a resistor R2, one end of the resistor R1 is connected with one end of the resistor R2, an input end of the diode D1 is connected with the other end of the resistor R1, and an output end of the diode D1 is connected with the other end of the resistor R2. The circuit is simple, and has reliable performance and low costs.
Description
Technical field
The utility model relates to a kind of signal that is applied to the infrared signal Opportunity awaiting control for linear and distributes buffer circuit.
Background technology
Under the situation of international energy crisis, along with enforcing of the EuP of European Union instruction, the standby low-power consumption functional requirement of various household electrical appliance is day by day strong, also becomes most of household electrical appliance institute necessary functions by the standby of infrared signal remote control home appliance.Traditional infrared signal Opportunity awaiting control for linear need to be controlled IC by plug-in MCU or plug-in special use and realize, under holding state, master chip need be in the power down off-mode simultaneously.Therefore, under this application model, just need to carry out special allocation process to infrared signal, preventing master chip under holding state, because the infrared interface power down of master chip makes signal be forced to set low, affect the standby wakeup of infrared signal.Traditional solution be adopt corresponding digital signal buffering IC, electronic switch or emitter follower carry out buffer compartment from, circuit cost is high.Therefore, need to improve this.
Summary of the invention
Task of the present utility model provides a kind of signal that is applied to the infrared signal Opportunity awaiting control for linear and distributes buffer circuit, task of the present utility model is achieved by the following technical solution: the signal that is applied to the infrared signal Opportunity awaiting control for linear of the present utility model distributes buffer circuit to be provided with diode D1, resistance R 1 and resistance R 2, resistance R 1 one ends are connected with resistance R 2 one ends, the input end of diode D1 is connected with resistance R 1, and the output terminal of diode D1 is connected with resistance R 2 other ends.
The signal that is applied to the infrared signal Opportunity awaiting control for linear of the present utility model distributes buffer circuit by cleverly design, only uses a diode and corresponding peripheral biasing resistor, realizes same function, circuit simply and dependable performance, and cost is low.
Description of drawings
Fig. 1 is application block diagram of the present utility model, is circuit of the present utility model in the dotted line frame.
Embodiment
Specific embodiment below in conjunction with accompanying drawing further specifies the utility model.(but not being to restriction of the present utility model).
Be circuit of the present utility model in Fig. 1 dotted line frame, the signal that is applied to the infrared signal Opportunity awaiting control for linear of the present utility model distributes buffer circuit to be provided with diode D1, resistance R 1 and resistance R 2, resistance R 1 one ends are connected with resistance R 2 one ends, the input end of diode D1 is connected with resistance R 1 other end, and the output terminal of diode D1 is connected with resistance R 2 other ends.
As shown in Figure 1, wherein:
IR IN is the infrared signal input end, takes from the infrared receiving module of machine system.
IR_OUT is defined as infrared output terminal.
VDD-MCU is the power supply of standby managing chip, provides biasing for the utility model circuit simultaneously.
VDD-CPU is the power supply of master chip.Under the normal operating conditions, magnitude of voltage (VDD-CPU)=(VDD-MCU); Under the holding state, this power supply is turned off and is 0V.
The input end of diode D1 and resistance R 1 other end junction are labeled as 1, and the output terminal of diode D1 and resistance R 2 end other end junctions are labeled as 2.
As shown in Figure 1, be application example of the present utility model, the infrared signal in the circuit is required to be assigned as two-way: wherein one the tunnel offer the standby managing chip, the input end of diode D1 is connected with the standby managing chip with resistance R 1 other end junction 1; Another road offers master chip, and the output terminal of diode D1 is connected with master chip with resistance R 2 other end junctions 2, and IR_OUT provides infrared signal to master chip after being distributed, isolate via circuit of the present utility model by IR IN.
Principle of work:
1. when working (non-holding state), VDD-MCU and VDD-CPU power simultaneously, and voltage is identical, this moment the IR_out(high level)=IR IN(high level), the IR_out(low level)=UD1=0.3V, meet standard interface level demand, the IR signal is transferred to master chip and is processed, R1, R2 are biasing resistor, and R1 provides pull-up current for the IR signaling interface simultaneously, and R1, R2 value can be 1K to 10K ohm.
2. under the holding state: the master chip outage, VDD-CPU=0V, IR_out are forced to set low, and diode is in reverse-bias state, and isolation master chip end is on the impact of IR IN signal.At this moment, IR IN directly sends into the standby managing chip, carries out corresponding control and management.
3. for reducing the diode forward bias voltage to low level impact under the IR_Out normal condition, this patent adopts little schottky diode or the germanium class diode of forward voltage drop, can be any this type of small-signal diode commonly used.Such as IN5817 or MA700
Under the normal operating conditions, IR_Out normally exports, and the IR signal is sent into master chip and carried out control and management; Holding state, this circuit isolation IR_Out is because of the impact of interface outage.The IR signal is directly sent into the standby managing chip and is carried out corresponding control and management.
When entering holding state in actual applications, master chip is in power failure state.Described circuit by diode the forward conduction characteristic and distribute branch road different realize isolation features at electricity condition, during the circuit normal operation, the IR signal is assigned to two-way, does not interfere with each other each other.Described control circuit adopts the foregoing circuit form to carry out signal distribution and isolation.
More than be embodiment of the present utility model, allly be familiar with the technique personnel, it is equal to change according to what the utility model was done, all ought to be included in this case claim.
Claims (2)
1. the signal that is applied to the infrared signal Opportunity awaiting control for linear distributes buffer circuit, it is characterized in that, the described signal that is applied to the infrared signal Opportunity awaiting control for linear distributes buffer circuit to be provided with diode D1, resistance R 1 and resistance R 2, resistance R 1 one ends are connected with resistance R 2 one ends, the input end of diode D1 is connected with resistance R 1 other end, and the output terminal of diode D1 is connected with resistance R 2 other ends.
2. the signal that is applied to the infrared signal Opportunity awaiting control for linear according to claim 1 distributes buffer circuit, it is characterized in that, the input end of diode D1 is connected with the standby managing chip with resistance R 1 other end junction; The output terminal of diode D1 is connected with master chip with resistance R 2 end other end junctions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220573645 CN202916628U (en) | 2012-11-03 | 2012-11-03 | Signal distribution and isolation circuit applied to infrared signal standby control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220573645 CN202916628U (en) | 2012-11-03 | 2012-11-03 | Signal distribution and isolation circuit applied to infrared signal standby control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916628U true CN202916628U (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220573645 Expired - Fee Related CN202916628U (en) | 2012-11-03 | 2012-11-03 | Signal distribution and isolation circuit applied to infrared signal standby control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202916628U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914987A (en) * | 2012-11-03 | 2013-02-06 | 福州福大海矽微电子有限公司 | Signal distribution isolation circuit applied to infrared signal standby control |
-
2012
- 2012-11-03 CN CN 201220573645 patent/CN202916628U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914987A (en) * | 2012-11-03 | 2013-02-06 | 福州福大海矽微电子有限公司 | Signal distribution isolation circuit applied to infrared signal standby control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20211103 |