CN201869215U - Carrier modulation circuit - Google Patents
Carrier modulation circuit Download PDFInfo
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- CN201869215U CN201869215U CN 201020621237 CN201020621237U CN201869215U CN 201869215 U CN201869215 U CN 201869215U CN 201020621237 CN201020621237 CN 201020621237 CN 201020621237 U CN201020621237 U CN 201020621237U CN 201869215 U CN201869215 U CN 201869215U
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Abstract
A carrier modulation circuit is used for modulating inputted sine wave signals by the aid of inputted digital modulating signals so as to obtain modulated output signals. The carrier modulation circuit comprises a modulating unit and a power amplifying unit. The modulating unit is a baypass circuit connected to an input position of the sine wave signals and consists of a trap filter circuit controlled by a first switch, the first switch is an electric control switch, and the digital modulation signals are control signals of the first switch. When the first switch is in a switch-on state, the trap filter circuit absorbs bypasses of the sine wave signals, when the first switch is in a switch-off state, the sine wave signals are transmitted to a post-stage circuit, and the control signals modulate the sine wave signals into modulating signals which carry effective information carried by the digital modulating signals during the processes of driving the first switch to be switched on and switched off. The power amplifying unit is used for amplifying the modulating signals. The carrier modulation circuit not only can meet the requirements of stability and reliability, but also can meet the requirements of lower cost and power consumption.
Description
Technical field
The present invention relates to power equipment, relate in particular to the communicating circuit in a kind of power equipment system.
Background technology
Automatic meter reading system is the classification that obtains comparatively extensive use in the power equipment system.In Automatic meter reading system, adopt the carrier communication mode usually, it is coupled to communication line after to be transmitting terminal be modulated at high_frequency sine wave signal and low frequency communication signal together, such as: on the low-voltage power transmission line, receiving terminal obtains communication signal by coupling, and the signal of communication that will carry effective information after making the high_frequency sine wave signal and low frequency communication signal is separated by demodulator circuit is again delivered to microprocessor and analyzed and explain to realize the transmission of information.
Existing carrier modulation circuit, two kinds of more common implementations are arranged, the first adopts diode, electric capacity, resistance and triode to form simple resonance oscillating circuit, low-frequency digital signal is modulated into the output of high frequency sinusoidal signal, the component parameter of built-up circuit must accurately be adjusted though this mode realizes easily, circuit stability and reliability are relatively poor, and be affected by environment easily; Its another be to adopt special-purpose carrier modulation integrated circuit, and cost height, complex structure are difficult to use in mini system.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of can either satisfy stability and reliability requirement, can satisfy cost again than carrier modulation the circuit low and requirement that power consumption is less.
The technical scheme that the present invention is directed to above-mentioned technical problem and propose comprises, proposes a kind of carrier modulation circuit, is used for a digital modulation signals of input is modulated to obtain a modulated output signal a sine wave signal of input, and this circuit comprises:
One modulating unit, it is the input that connects this sine wave signal, by a bypass circuit that constituted by a notch filter circuit of first switch control, this first switch is an electric-controlled switch, this digital modulation signals is the control signal of this first switch, when this first switch is in closure state, this notch filter circuit sponges this sine wave signal bypass, when this first switch is in off-state, this sine wave signal is delivered to late-class circuit, drive this first switch in this control signal and disconnect, just this sine wave signal is modulated into a modulation signal that has carried the entrained effective information of this digital modulation signals in the closed process; And
One power amplification unit is in order to carry out processing and amplifying with this modulation signal.
Also comprise: a filter unit, in order to leach clutter.
Also comprise: a coupling unit, be coupled on the communication line in order to the signal that will export Filtering Processing.
Also comprise: a transmitting-receiving switch unit, in order to when this modulating unit is in operating conditions, this modulation signal is sent on this communication line.
This notch filter circuit is an inductance capacitance resonant selecting frequency band-pass circuit.
This first switch is formed by two metal-oxide-semiconductor serial connections, or has a relay to constitute.
This transmitting-receiving switch unit is an electronic switch, and this electronic switch is formed by two metal-oxide-semiconductor serial connections, or has a relay to constitute.
Compared with prior art, carrier modulation circuit of the present invention, its beneficial effect comprises:
Can fast modulation; The carrier communication rate adjusted; Circuit is simple, and cost is lower; Power consumption is very low; And it is little influenced by ambient temperature etc., working stability, reliable.
Description of drawings
Fig. 1 is the electric theory diagram of carrier modulation circuit embodiments of the present invention.
Fig. 2 is the input/output signal figure of carrier modulation circuit embodiments of the present invention.
Fig. 3 is the electrical schematic diagram of carrier modulation circuit embodiments one of the present invention.
Fig. 4 is the electrical schematic diagram of carrier modulation circuit embodiments two of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is given elaboration further.
Fig. 1 is the electric theory diagram of carrier modulation circuit embodiments of the present invention, and Fig. 2 is the input/output signal figure of carrier modulation circuit embodiments of the present invention.This circuit is made up of modulating unit 1, power amplification unit 2, transmitting-receiving switch unit 3, filter unit 4 and coupling unit 5.The operation principle of this circuit: the modulating unit 1 of circuit is delivered to power amplification unit 2 after being modulated to continuous sinusoidal high-frequency signal IN and the low frequency switching signal CTRL1 that carries useful information together, the signal OUT2 that obtains modulating is to improve the carrying load ability of circuit; Can control these transmitting-receiving switch unit 3 actions by control signal CTRL2 takes place effectively to prevent crosstalk phenomenon; But it is, stable more, reliable when making circuit communication by using the harmonic noise of filter unit 4 filtering carrier signals; By using coupling unit 5 the modulation signal OUT1 through Filtering Processing can be coupled on the communication line to transfer out.
Fig. 3 is the electrical schematic diagram of carrier modulation circuit embodiments one of the present invention.Wherein,
Modulating unit 1 is to be made of capacitor C 1, inductance L 1 and the switch that is in series by two metal-oxide-semiconductor Q1, Q2.Its concrete course of work comprises: when the low frequency switching signal CTRL1 control switch of carrying useful information is in closure state, utilize LC resonant selecting frequency band to lead to principle, IN sponges with the high_frequency sine wave signal, when this low frequency switching signal CTRL1 control switch is in cut-off state, LC resonant selecting frequency band-pass circuit is ineffective, the high_frequency sine wave signal can be transferred to back level power amplification unit 2, finishes whole modulated process.Need to prove that this place's switch uses two metal-oxide-semiconductor series connection, could effectively control the positive half cycle and the negative half period of sine wave signal like this.In a specific implementation that can realize the 9600BPS signaling rate, this high_frequency sine wave signal is 50KHz, and just the frequency ratio of this high_frequency sine wave signal and low frequency switching signal is about 10: 1, generally speaking, this ratio is to be the bigger the better, and after tested, this ratio should be not less than 8: 1.
Power amplification unit 2 be by resistance R 1 to R5, capacitor C 2, C3 and C4, and amplifier U1 constitutes.Wherein, resistance R 2, R5 provide direct current biasing; Resistance R 1, R4, capacitor C 2, C4 constitute the feedback network of amplifier U1, by resistance R 1, the multiplication factor of R4 regulated amplifier U1; Capacitor C 2 can prevent to produce self-oscillation, and resistance R 3 can play the current-limiting protection effect, and capacitor C 3 can play the AC coupled effect, through the processing of this power amplification unit 2, the signal OUT2 that can obtain modulating.
Transmitting-receiving switch unit 3 is the switches that are in series by two metal-oxide-semiconductor Q3, Q4.Can control 3 of switch units of transmitting-receiving closure when the transmit status by control signal CTRL2; When accepting state, then be in cut-off state, thereby feed back to modulation circuit and bring to modulated process and crosstalk to take precautions against signal on the communication line, noise etc.
Filter unit 4 is by resistance R 6, and inductance L 3 and capacitor C 5 constitute.Wherein inductance L 3 and capacitor C 5 are formed LC resonant selecting frequency band stop filter, the unwanted clutter of filtering.
Fig. 4 is the electrical schematic diagram of carrier modulation circuit embodiments two of the present invention.The difference of itself and the foregoing description one is: the switch that constitutes with a relay has substituted the switch that is in series by two metal-oxide-semiconductor Q1, Q2 of the foregoing description one; The switch that constitutes with another relay has substituted another switch that is in series by two metal-oxide-semiconductor Q3, Q3 of the foregoing description one.
Foregoing; it only is preferred embodiment of the present invention; be not to be used to limit embodiment of the present invention; those of ordinary skills are according to main design of the present invention and spirit; can carry out corresponding flexible or modification very easily, so protection scope of the present invention should be as the criterion with the desired protection range of claims.
Claims (7)
1. a carrier modulation circuit is used for a digital modulation signals of input is modulated to obtain a modulated output signal a sine wave signal of input, it is characterized in that, comprising:
One modulating unit, it is the input that connects this sine wave signal, by a bypass circuit that constituted by a notch filter circuit of first switch control, this first switch is an electric-controlled switch, this digital modulation signals is the control signal of this first switch, when this first switch is in closure state, this notch filter circuit sponges this sine wave signal bypass, when this first switch is in off-state, this sine wave signal is delivered to late-class circuit, drive this first switch in this control signal and disconnect, just this sine wave signal is modulated into a modulation signal that has carried the entrained effective information of this digital modulation signals in the closed process; And
One power amplification unit is in order to carry out processing and amplifying with this modulation signal.
2. carrier modulation circuit as claimed in claim 1 is characterized in that, also comprises: a filter unit, and in order to leach clutter.
3. carrier modulation circuit as claimed in claim 2 is characterized in that, also comprises: a coupling unit, be coupled on the communication line in order to the signal that will export Filtering Processing.
4. carrier modulation circuit as claimed in claim 3 is characterized in that, also comprises: a transmitting-receiving switch unit, and in order to when this modulating unit is in operating conditions, this modulation signal is sent on this communication line.
5. carrier modulation circuit as claimed in claim 1 is characterized in that, this notch filter circuit is an inductance capacitance resonant selecting frequency band-pass circuit.
6. carrier modulation circuit as claimed in claim 1 is characterized in that, this first switch is formed by two metal-oxide-semiconductor serial connections, or has a relay to constitute.
7. carrier modulation circuit as claimed in claim 1 is characterized in that, this transmitting-receiving switch unit is an electronic switch, and this electronic switch is formed by two metal-oxide-semiconductor serial connections, or has a relay to constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020621237 CN201869215U (en) | 2010-11-18 | 2010-11-18 | Carrier modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020621237 CN201869215U (en) | 2010-11-18 | 2010-11-18 | Carrier modulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201869215U true CN201869215U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020621237 Expired - Lifetime CN201869215U (en) | 2010-11-18 | 2010-11-18 | Carrier modulation circuit |
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| Country | Link |
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| CN (1) | CN201869215U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468870A (en) * | 2010-11-18 | 2012-05-23 | 深圳长城开发科技股份有限公司 | Carrier wave modulating method and circuit |
| CN103338060A (en) * | 2013-07-10 | 2013-10-02 | 北京溢美四方软件技术有限公司 | Input signal protection circuit based on electric carrier communication |
-
2010
- 2010-11-18 CN CN 201020621237 patent/CN201869215U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468870A (en) * | 2010-11-18 | 2012-05-23 | 深圳长城开发科技股份有限公司 | Carrier wave modulating method and circuit |
| CN103338060A (en) * | 2013-07-10 | 2013-10-02 | 北京溢美四方软件技术有限公司 | Input signal protection circuit based on electric carrier communication |
| CN103338060B (en) * | 2013-07-10 | 2016-01-06 | 北京博纳电气股份有限公司 | Based on the input signal protective circuit of power carrier communication |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20110615 |