CN2450839Y - Cordless telephone with phone interface circuit - Google Patents
Cordless telephone with phone interface circuit Download PDFInfo
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- CN2450839Y CN2450839Y CN 00239509 CN00239509U CN2450839Y CN 2450839 Y CN2450839 Y CN 2450839Y CN 00239509 CN00239509 CN 00239509 CN 00239509 U CN00239509 U CN 00239509U CN 2450839 Y CN2450839 Y CN 2450839Y
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Abstract
The utility model relates to a novel cordless telephone with a telephone interface circuit, which comprises a host machine, a mobile phone, and a power supply adaptor 13. The utility model is characterized in that the host machine comprises a casing, a high-frequency receiving/transmitting circuit 10, a control circuit 11, stabilized voltage supply 12, and an interface circuit 16; the input/output end of the high-frequency receiving/transmitting circuit is connected with the input/output port of the control circuit 11; the interface circuit 16 is connected in parallel to a phone line, and the signal output end of the interface circuit is connected with the input/output port of the control circuit 11; the interface circuit 16 can restrain high voltage, preventing the circuit element of the host machine from being damaged because of abnormal current feed. The utility model has the advantages of good insulating property, adjustable damage returning and electroacoustic index, and high safety.
Description
The utility model relates to a kind of cordless telephone, particularly a kind of cordless telephone with novel telephone interface circuit.Belong to the telephone terminal technical field.
According to the safety requirements among the national standard GB 17113-1997 of cordless telephone, telephone wire and telephone set expose and should insulate between conductor and withstand voltage greater than 500V.External audio frequency transformer commonly used is as the usefulness of outside line and circuit isolation, signal coupling and anti-sidetone.But there is following shortcoming in audio frequency transformer: (1) volume is big, (2) and easily produce magnetic saturation and make return loss (be called for short: return loss) index variation, (3) sidetone index are difficult to mix up, and can't realize automatic gain control when loop current is big.Therefore, adopt the audio frequency transformer method to be difficult to satisfy some control the countries and regions of having relatively high expectations to return loss, sidetone and automatic gain requirement.China is the country that return loss, sidetone and automatic gain control are had relatively high expectations, so China should not adopt described audio frequency transformer method.In order to reach the national standard of China's cordless telephone; the way of prior art is not generally isolated at outside line and circuit part; and expose isolation between conductor (mainly being antenna and charging contact) at circuit and telephone set; though can improve the return loss index; but still have following shortcoming: (1) easily produces power frequency and disturbs, and (2) are the unusual or integration module in fragile microprocessor and high-frequency circuit, the speaking circuit when meeting with thunderbolt when telephone BORSHT functions.
The purpose of this utility model is easily to produce the power frequency interference in order to overcome existing technology cordless telephone; easily damage the shortcoming of the integrated circuit in the telephone set unusually because of feed; a kind of cordless telephone with the new interface circuit is provided; this cordless telephone function satisfies telephone wire and cordless telephone exposes the requirement of insulating between conductor; its return loss; the standard that meets each countries and regions is adjusted in sidetone index and automatic gain control easily; and circuit is simple; volume is little; safety can be protected microprocessor and high frequency; unusual or thunderbolt does not damage the core components and parts of conversation part because of telephone BORSHT functions.
The purpose of this utility model can reach by taking following technical measures: with the cordless telephone of novel telephone interface circuit, comprise main frame, mobile phone and power supply adaptor, mobile phone, power supply adaptor are same as the prior art, its design feature is: main frame comprises shell, places high frequency reception/radiating circuit, control circuit, stabilized voltage power supply, the interface circuit of shell; The output of power supply adaptor connects the power end of high frequency reception/radiating circuit, control circuit by stabilized voltage power supply, the I/O end of high frequency reception/radiating circuit is connected with the I/O port of control circuit, interface circuit is parallel on the telephone wire, its signal output part connects the I/O port of control circuit, and interface circuit can suppress high voltage, prevent that the host circuit element from damaging unusually because of feed.
The purpose of this utility model also can reach by taking following technical measures:
Host circuit also comprises the speech amplifying circuit, and the speech amplifying circuit is formed by receiving amplifying circuit and sending amplifying circuit; Interface circuit is formed by connecting by lightning prevention circuit, ring detecting circuit, switching circuit, polarity transformation circuits, constant-current source and anti-side-tone circuit, transmission auto-gain circuit, reception auto-gain circuit, reception isolating coupler, transmission isolating coupler; Lightning prevention circuit is parallel to the telephone wire two ends, telephone wire connects an I/O mouth of control circuit by ring detecting circuit, the input that connects polarity transformation circuits by switching circuit, the output of polarity transformation circuits connects constant-current source and anti-side-tone circuit respectively, send the input of isolating coupler, the signal output part of high frequency reception/radiating circuit connects the signal input part that sends isolating coupler by sending amplifying circuit, the signal output part that sends isolating coupler connects the signal input part of constant-current source and anti-side-tone circuit, and the signal output part of constant-current source and anti-side-tone circuit is by receiving isolating coupler, receive the signal input part that amplifying circuit connects high frequency reception/radiating circuit.
Lightning prevention circuit 15 suppresses telephone line voltages below 300V.
Compared with prior art, the utlity model has following outstanding advantage:
1. can satisfy telephone wire and cordless telephone and expose insulating requirements between the conductor, between the two withstand voltage greater than 500V.
2. can conveniently adjust the return loss and the electroacoustic index of circuit, to reach the technical standard in country variant and area.
3. effectively suppress the high voltage in the feed circuit, unusual or thunderbolt does not damage safety and reliability height to his chip that can protect microprocessor chip and high-frequency circuit thereof part because of feed.
3. circuit structure is simple, and is with low cost, stable performance.
Below in conjunction with accompanying drawing the utility model is described in detail:
Fig. 1 is the host circuit structured flowchart of the utility model embodiment 1.
Fig. 2 is the electrical schematic diagram of Fig. 1.
Fig. 1, Fig. 2 constitute embodiment 1 of the present utility model.Comprise main frame, mobile phone and power supply adaptor 13 from present embodiment, mobile phone, power supply adaptor 13 are same as the prior art.
As can be seen from Figure 1, main frame comprises shell, places high frequency reception/radiating circuit 10, control circuit 11, stabilized voltage power supply 12, interface circuit 16, the speech amplifying circuit 17 of shell; Speech amplifying circuit 17 is formed by receiving amplifying circuit 8 and sending amplifying circuit 9, interface circuit 16 is by lightning prevention circuit 15, ring detecting circuit 14, switching circuit 1, polarity transformation circuits 2, constant-current source and anti-side-tone circuit 3, send auto-gain circuit 4, receive auto-gain circuit 5, receive isolating coupler 6, sending isolating coupler 7 is formed by connecting, lightning prevention circuit 15 is parallel to the telephone wire two ends, telephone wire connects an I/O mouth of control circuit 11 by ring detecting circuit 14, the input that connects polarity transformation circuits 2 by switching circuit 1, the output of polarity transformation circuits 2 connects constant-current source and anti-side-tone circuit 3 respectively, send the input of isolating coupler 7, the signal output part of high frequency reception/radiating circuit 10 connects the signal input part that sends isolating coupler 7 by sending amplifying circuit 9, the signal output part that sends isolating coupler 7 connects the signal input part of constant-current source and anti-side-tone circuit 3, and the signal output part of constant-current source and anti-side-tone circuit 3 is by receiving isolating coupler 6, receive the signal input part that amplifying circuit 8 connects high frequency reception/radiating circuit 10.
As can be seen from Figure 2, lightning prevention circuit 15 is formed by connecting by lightning protection diode SA1, inductance L 1 and L2, capacitor C 6; Switching circuit 1 is owing to spring relay R Y1, diode D1, triode Q1, resistance R 3 and R51 are formed by connecting; Polarity transformation circuits 2 is formed by connecting by rectifier diode D2, D3, D4, D5; Constant-current source and anti-side-tone circuit 3 are formed by connecting by triode Q2, resistance R 7, R10～R14 and capacitor C 12, C13; Sending auto-gain circuit 4 is formed by connecting by resistance R 8, R9, capacitor C 9, C10 and voltage stabilizing didoe ZD2; Receiving auto-gain circuit 4 is formed by connecting by resistance R 15 and voltage stabilizing didoe ZD3; Receiving isolating coupler 6 is formed by connecting by audio frequency transformer T1, capacitor C 14; Sending isolating coupler 7 is formed by connecting by audio frequency transformer T2, capacitor C 14 and resistance R 52; Receiving amplifying circuit 8 is that operational amplifier IC3, resistance R 37 and R38, the capacitor C 16 of LM358 is formed by connecting by model; Sending amplification path 9 is that operational amplifier IC3, resistance R 16, R39～R44, capacitor C 15, C17, the C19～C21 of LM358 is formed by connecting by model; It is the high-frequency model that the FM receiving demodulation IC of MC3361 forms and peripheral resistance, electric capacity are formed that high frequency reception/radiating circuit 10 generally adopts model by prior art; Control circuit 11 is that little process chip IC1, the model of EM94015 is that the chip IC2 that resets, crystal oscillator X1, triode Q4, Q7～Q10, P/T type selector switch SW1 and some resistance, the electric capacity of KIA7027 is formed by connecting by model, and wherein selector switch SW1 and some resistance, electric capacity connect into the charging testing circuit; Stabilized voltage power supply 12 is formed by connecting by triode Q3, voltage-stabiliser tube ZD4, resistance R 1～R2, capacitor C 4～C5, diode D11～D12; Ring detecting circuit 14 is that the photoelectrical coupler PC1 of PC817 is formed by connecting by rectifier diode D16～D9, capacitor C 7～C8, resistance R 4～R6, model; Wherein:
The input of lightning prevention circuit 15 is connected the end of ring detecting circuit 14 and dry-reed relay RY1 with external telephone wire parallel connection, output; The ring that the output of ring detecting circuit 14 connects IC1 detects input pin RSD; The input of another termination polarity transformation circuits 2 of dry-reed relay RY1, the closing of the circuit output control pin PULSE of the control termination IC1 of dry-reed relay RY1; The output termination constant-current source of polarity transformation circuits 2 and the input of anti-side-tone circuit 3; Receiving auto-gain circuit 4 is connected between the output and power supply ground of constant-current source and anti-side-tone circuit 3; The input that sends auto-gain circuit 4 is connected on the emitter of Q2, the base stage that output is connected on Q2; Receive the input termination constant-current source of isolating coupler 6 and output, the output of anti-side-tone circuit 3 and connect the input that receives amplifying circuit 8; The input that sends isolating coupler 7 receives and sends the base stage of the output of amplifying circuit 9, output termination Q2; Send the demodulation audio output RXAF of the input termination high frequency reception/radiating circuit 10 of amplifying circuit 9, also connect the dual tone multi-frequency dtmf end of little process chip IC1 simultaneously; The noise measuring output CDI of high frequency reception/radiating circuit 10 meets the noise measuring input CDI of IC1, receive the reception data input pin RXDATA of data output end RXDTA control circuit 11, emission data input pin TXDATA meets the emission data output pin DATO of IC1, and emission power control input end TXEN meets the emission power control output pin TXEN of IC1; The output of the input termination power supply adaptor 13 of stabilized voltage power supply 12, the power supply end of each one of output termination of stabilized voltage power supply 12.
Lightning prevention circuit 15 suppresses telephone line voltages below 300V.
Operation principle of the present utility model is as follows:
When outside line is squeezed into, ring detecting circuit 14 detects bell signal and gives the input of little process chip IC1, little process chip IC1 handles the bell signal that receives after mobile phone is modulated and be transmitted to high frequency reception/radiating circuit 10, at this moment the mobile phone bell ring.If mobile phone feedback connection signal, this feedback signal is given little process chip IC1 behind high frequency reception/radiating circuit 10 receiving demodulations, little process chip IC1 output this moment control signal is controlled dried spring relay RY1 closure, closing of the circuit, the telephone signal that main frame receives sends to mobile phone through polarity transformation circuits 2, constant-current source and anti-side-tone circuit 3, reception auto-gain circuit 5, reception isolating coupler 6, reception amplifying circuit 8, high frequency reception/radiating circuit 10 successively, and exports from the receiver of mobile phone; The voice signal of listener's transmission is transmitted to main frame after the mobile phone transmitter carries out acoustic-electric conversion, amplifies and modulates, main frame is sent to outside line through high frequency reception/radiating circuit 10 receiving demodulations, transmission amplifying circuit 9, transmission isolating coupler 7, transmission auto-gain circuit 4, constant-current source and anti-side-tone circuit 3, polarity transformation circuits 2 successively.
Unusual or when the thunderbolt high-voltage pulse is arranged when telephone BORSHT functions; be suppressed to below the 300V through lightning prevention circuit 15; can not enter the main frame core circuit owing to receive the isolation of isolating coupler 6, transmission isolating coupler 7, thereby play the not impaired effect of protection main frame core circuit.
Claims (3)
1. with the cordless telephone of novel telephone interface circuit, comprise main frame, mobile phone and power supply adaptor (13), mobile phone, power supply adaptor (13) are same as the prior art, it is characterized in that: main frame comprises shell, places high frequency reception/radiating circuit (10), control circuit (11), stabilized voltage power supply (12), the interface circuit (16) of shell; The output of power supply adaptor (13) connects the power end of high frequency reception/radiating circuit (10), control circuit (11) by stabilized voltage power supply (12), the I/O end of high frequency reception/radiating circuit (10) is connected with the I/O port of control circuit (11), interface circuit (16) is parallel on the telephone wire, its signal output part connects the I/O port of control circuit (11), and interface circuit (16) can suppress high voltage, prevent that the host circuit element from damaging unusually because of feed.
2. the cordless telephone with novel telephone interface circuit according to claim 1 is characterized in that: host circuit also comprises speech amplifying circuit (17), and speech amplifying circuit (17) is formed by receiving amplifying circuit (8) and sending amplifying circuit (9); Interface circuit (16) is formed by connecting by lightning prevention circuit (15), ring detecting circuit (14), switching circuit (1), polarity transformation circuits (2), constant-current source and anti-side-tone circuit (3), transmission auto-gain circuit (4), reception auto-gain circuit (5), reception isolating coupler (6), transmission isolating coupler (7); Lightning prevention circuit (15) is parallel to the telephone wire two ends, telephone wire connects an I/O mouth of control circuit (11) by ring detecting circuit (14), the input that connects polarity transformation circuits (2) by switching circuit (1), the output of polarity transformation circuits (2) connects constant-current source and anti-side-tone circuit (3) respectively, send the input of isolating coupler (7), the signal output part of high frequency reception/radiating circuit (10) connects the signal input part that sends isolating coupler (7) by sending amplifying circuit (9), the signal output part that sends isolating coupler (7) connects the signal input part of constant-current source and anti-side-tone circuit (3), and the signal output part of constant-current source and anti-side-tone circuit (3) is by receiving isolating coupler (6), receive the signal input part that amplifying circuit (8) connects high frequency reception/radiating circuit (10).
3. the cordless telephone with novel telephone interface circuit according to claim 2 is characterized in that: lightning prevention circuit (15) is formed by connecting by lightning protection diode SA1, inductance L 1 and L2, capacitor C 6; Switching circuit (1) is formed by connecting by dry-reed relay RY1, diode D1, triode Q1, resistance R 3 and R51; Polarity transformation circuits (2) is formed by connecting by rectifier diode D2, D3, D4, D5; Constant-current source and anti-side-tone circuit (3) are formed by connecting by triode Q2, resistance R 7, R10～R14 and capacitor C 12, C13; Sending auto-gain circuit (4) is formed by connecting by resistance R 8, R9, capacitor C 9, C10 and voltage stabilizing didoe ZD2; Receiving auto-gain circuit (4) is formed by connecting by resistance R 15 and voltage stabilizing didoe ZD3; Receiving isolating coupler (6) is formed by connecting by audio frequency transformer T1, capacitor C 14; Sending isolating coupler (7) is formed by connecting by audio frequency transformer T2, capacitor C 14 and resistance R 52; Receiving amplifying circuit (8) is that operational amplifier IC3, resistance R 37 and R38, the capacitor C 16 of LM358 is formed by connecting by model; Sending amplification path (9) is that operational amplifier IC3, resistance R 16, R39～R44, capacitor C 15, C17, the C19～C21 of LM358 is formed by connecting by model; It is the high-frequency model that the FM receiving demodulation IC of MC3361 forms and peripheral resistance, electric capacity are formed that high frequency reception/radiating circuit (10) generally adopts model by prior art; Control circuit (11) is that little process chip IC1, the model of EM94015 is that the chip IC2 that resets, crystal oscillator X1, triode Q4, Q7～Q10, P/T type selector switch SW1 and some resistance, the electric capacity of KIA7027 is formed by connecting by model, and wherein selector switch SW1 and some resistance, electric capacity connect into the charging testing circuit; Stabilized voltage power supply (12) is formed by connecting by triode Q3, voltage-stabiliser tube ZD4, resistance R 1～R2, capacitor C 4～C5, diode D11～D12; Ring detecting circuit (14) is that the photoelectrical coupler PC1 of PC817 is formed by connecting by rectifier diode D16～D9, capacitor C 7～C8, resistance R 4～R6, model; Wherein:
The input of lightning prevention circuit (15) is connected the end of ring detecting circuit (14) and dry-reed relay RY1 with external telephone wire parallel connection, output; The ring that the output of ring detecting circuit (14) connects IC1 detects input pin RSD; The input of another termination polarity transformation circuits (2) of dry-reed relay RY1, the closing of the circuit output control pin PULSE of the control termination IC1 of dry-reed relay RY1; The input of the output termination constant-current source of polarity transformation circuits (2) and anti-side-tone circuit (3); Receiving auto-gain circuit (4) is connected between the output and power supply ground of constant-current source and anti-side-tone circuit (3); The input that sends auto-gain circuit (4) is connected on the emitter of Q2, the base stage that output is connected on Q2; Receive the input termination constant-current source of isolating coupler (6) and output, the output of anti-side-tone circuit (3) and connect the input that receives amplifying circuit (8); The input that sends isolating coupler (7) receives and sends the base stage of the output of amplifying circuit (9), output termination Q2; Send the demodulation audio output RXAF of the input termination high frequency reception/radiating circuit (10) of amplifying circuit (9), also connect the dual tone multi-frequency dtmf end of little process chip IC1 simultaneously; The noise measuring output CDI of high frequency reception/radiating circuit (10) meets the noise measuring input CDI of IC1, receive the reception data input pin RXDATA of data output end RXDTA control circuit (11), emission data input pin TXDATA meets the emission data output pin DATO of IC1, and emission power control input end TXEN meets the emission power control output pin TXEN of IC1; The output of the input termination power supply adaptor (13) of stabilized voltage power supply (12), the power supply end of each one of output termination of stabilized voltage power supply (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00239509 CN2450839Y (en) | 2000-09-21 | 2000-09-21 | Cordless telephone with phone interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00239509 CN2450839Y (en) | 2000-09-21 | 2000-09-21 | Cordless telephone with phone interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2450839Y true CN2450839Y (en) | 2001-09-26 |
Family
ID=33600352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00239509 Expired - Fee Related CN2450839Y (en) | 2000-09-21 | 2000-09-21 | Cordless telephone with phone interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2450839Y (en) |
-
2000
- 2000-09-21 CN CN 00239509 patent/CN2450839Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |