CN210780784U - Low-cost direct current carrier circuit system - Google Patents
Low-cost direct current carrier circuit system Download PDFInfo
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- CN210780784U CN210780784U CN201922431573.0U CN201922431573U CN210780784U CN 210780784 U CN210780784 U CN 210780784U CN 201922431573 U CN201922431573 U CN 201922431573U CN 210780784 U CN210780784 U CN 210780784U
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Abstract
The utility model discloses a low-cost direct current carrier circuit system, which comprises a sending circuit and a receiving circuit, wherein the sending circuit is connected with the receiving circuit through a power line; the receiving circuit comprises a positive input end and a negative input end which are respectively connected with the power line, a second resistor is arranged between the positive input end and the negative input end, a power supply rectifying and filtering module and a differential signal extraction module are connected between the second resistor and the positive input end in parallel, and the differential signal extraction module is also connected with a Schmidt signal recovery module in series. The utility model has the characteristics of circuit structure is simple and area occupied is little and with low costs.
Description
Technical Field
The utility model relates to a direct current carrier circuit system, especially a low-cost direct current carrier circuit system.
Background
With the rapid development of social economy, the power line carrier communication is widely applied to the field of power systems, particularly low-speed unidirectional communication, by virtue of the advantages of long communication distance, low cost, high signal transmission reliability and the like. At present, in the direct current carrier communication, a carrier signal is coupled to a power line through a direct current carrier transmission device, the carrier signal is extracted through a direct current carrier receiving device, a carrier driving signal is generated through processing, and the carrier driving signal is coupled to the power line, so that unidirectional communication of signals is realized. However, the above-described dc carrier transmission device and dc carrier reception device require a current transformer coil to be provided for each, and therefore, the circuit occupies a large area and is expensive. In addition, technicians develop a special chip for a carrier modulation and demodulation circuit, and integrate special algorithms for modulation, networking, routing and the like, but the cost is high, the circuit is complex, and the method is not suitable for a simple power carrier system. Therefore, the prior art has the problems of large occupied area of the circuit and high cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low-cost direct current carrier circuit system. The utility model has the characteristics of circuit structure is simple and area occupied is little and with low costs.
The technical scheme of the utility model: the low-cost direct current carrier circuit system comprises a transmitting circuit and a receiving circuit, wherein the transmitting circuit is connected with the receiving circuit through a power line; the receiving circuit comprises a positive input end and a negative input end which are respectively connected with the power line, a second resistor is arranged between the positive input end and the negative input end, a power supply rectifying and filtering module and a differential signal extraction module are connected between the second resistor and the positive input end in parallel, and the differential signal extraction module is also connected with a Schmidt signal recovery module in series.
In the low-cost dc carrier circuit system, the power supply rectification and filtering module includes a diode and a second capacitor connected in series in sequence, and a dc power supply output terminal is arranged between the diode and the second capacitor.
In the aforementioned low-cost dc carrier circuit system, the differential signal extraction module is sequentially connected to a third resistor and a third capacitor in series.
In the low-cost dc carrier circuit system, the schmitt signal recovery module includes a schmitt trigger connected in series with the differential signal extraction module, an input end of the schmitt trigger is provided with two parallel fourth resistors and fifth resistors, and an output end of the schmitt trigger is provided with a signal output line terminal.
In the low-cost dc carrier circuit system, the transmitting circuit includes a switch module, and a switch driving module is connected in parallel to the switch module.
In the low-cost dc carrier circuit system, the switch module includes a dc power input end and a ground end, a first switch and a second switch are sequentially connected in series between the dc power input end and the ground end, a positive output line end and a negative output line end are connected in parallel between the first switch and the second switch, and a first resistor is connected in series on the negative output line end; a first capacitor is connected in parallel between the input end of the direct current power supply and the first switch.
In the low-cost dc carrier circuit system, the positive output line terminal and the negative output line terminal are respectively connected to the power line.
In the low-cost dc carrier circuit system, the switch driving module includes a switch control unit and a signal reversal switch control unit connected in series, and a signal input terminal is connected between the switch control unit and the signal reversal switch control unit; the output end of the switch control unit is connected with the control end of the first switch, and the output end of the signal reversal switch control unit is connected with the control end of the second switch.
Compared with the prior art, the utility model consists of a generating circuit and a receiving circuit which are connected by a power line, and can transmit signals, the occupied area of the circuit is small, and the cost is low; the receiving circuit consists of a power supply rectifying and filtering module, a differential signal extraction module and a Schmitt signal recovery module, wherein the power supply rectifying and filtering module converts intermittently switched current into relatively stable direct current for supplying power to equipment, the differential signal extraction module is used for extracting a current jump part signal at an input end, and the Schmitt signal recovery module recovers a pulse jump signal into an original high-low level signal; the transmitting circuit is composed of a switch driving module and a switch module, wherein signals needing carrier waves are converted into corresponding driving levels through the switch driving module, and the driving levels are used for driving the switch module to be switched on and off so as to control the on-off of output current of the output end. The mode of direct carrier wave on the direct current power supply line is adopted, the transmitting circuit converts the high and low levels of signals into the on-off of a power supply, the receiving circuit realizes a relatively stable power supply through unidirectional conduction and capacitive filtering, and in addition, the signal part is recovered through a differential circuit and a Schmidt circuit. And simultaneously, the utility model discloses a power rectification filtering module before the use equipment can realize that the DC power supply output need not distinguish positive negative pole and insert the use equipment. To sum up, the utility model has the characteristics of circuit structure is simple and area occupied is little and with low costs.
Drawings
FIG. 1 is a circuit schematic of a receiving circuit;
FIG. 2 is a circuit schematic of a transmit circuit;
fig. 3 is a circuit diagram of an IR2104 bridge MOSFET driver chip.
The labels in the figures are: 1-positive input end, 2-negative input end, 3-second resistor, 4-power rectification filter module, 5-differential signal extraction module, 6-schmitt signal recovery module, 401-diode, 402-second capacitor, 403-direct current power output end, 501-third resistor, 502-third capacitor, 601-schmitt trigger, 602-fourth resistor, 603-fifth resistor, 604-signal output line end, 7-switch module, 8-switch driving module, 701-direct current power input end, 702-ground end, 703-first switch, 704-second switch, 705-positive output line end, 706-negative output line end, 707-first resistor, 708-first capacitor, 801-switch control unit, 802-signal reversal switch control unit, 803-signal input terminal.
Detailed Description
The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.
Examples are given. The low-cost direct current carrier circuit system is formed as shown in figures 1 to 2 and comprises a transmitting circuit and a receiving circuit, wherein the transmitting circuit is connected with the receiving circuit through a power line; the receiving circuit comprises a positive input end 1 and a negative input end 2 which are respectively connected with a power line, a second resistor 3 is arranged between the positive input end 1 and the negative input end 2, a power supply rectifying and filtering module 4 and a differential signal extraction module 5 are connected between the second resistor 3 and the positive input end 1 in parallel, and the differential signal extraction module 5 is also connected with a Schmidt signal recovery module 6 in series.
The negative input terminal is also connected to ground GND.
The power supply rectification filter module 4 comprises a diode 401 and a second capacitor 402 which are connected in series in sequence, and a direct current power supply output end 403 is arranged between the diode 401 and the second capacitor 402.
VLEDs are also connected in parallel between the diode 401 and the second capacitor 402. The other end of the second capacitor is grounded.
The differential signal extraction module 5 is sequentially connected with a third resistor 501 and a third capacitor 502 in series.
The schmitt signal recovery module 6 comprises a schmitt trigger 601 connected in series with the differential signal extraction module 5, the input end of the schmitt trigger 601 is provided with a fourth resistor 602 and a fifth resistor 603 which are connected in parallel, and the output end of the schmitt trigger 601 is provided with a signal output line terminal 604.
The fourth resistor 602 is connected to the terminal VDD, and the fifth resistor 603 is connected to the ground GND.
The transmitting circuit comprises a switch module 7, and a switch driving module 8 is connected in parallel on the switch module 7.
The switch module 7 comprises a direct-current power supply input terminal 701 and a ground terminal 702, a first switch 703 and a second switch 704 are sequentially connected in series between the direct-current power supply input terminal 701 and the ground terminal 702, a positive output line terminal 705 and a negative output line terminal 706 are connected in parallel between the first switch 703 and the second switch 704, and a first resistor 707 is connected in series on the negative output line terminal 706; a first capacitor 708 is connected in parallel between the dc power input terminal 701 and the first switch 703.
The other end of the first capacitor is grounded.
The negative output line end is also connected with the ground GND.
The positive output line terminal 705 and the negative output line terminal 706 are respectively connected to a power line.
The switch driving module 8 comprises a switch control unit 801 and a signal reversal switch control unit 802 which are connected in series, and a signal input end 803 is connected between the switch control unit 801 and the signal reversal switch control unit 802; the output terminal of the switch control unit 801 is connected to the control terminal of the first switch 703, and the output terminal of the signal reversal switch control unit 802 is connected to the control terminal of the second switch 704.
The switch control unit 801 and the signal inversion switch control unit 802 may use a circuit formed by an IR2104 bridge MOSFET driving chip to realize corresponding functions. As shown in fig. 3.
A use method of a low-cost direct current carrier circuit system is characterized in that a sending circuit converts high and low level signals into on and off of a power supply, current and signals are transmitted to a receiving circuit through a power line, and the receiving circuit conducts, sorts and filters the current through a power supply rectifying and filtering module to realize a relatively stable output power supply; and then the signals are recovered through a differential signal extraction module and a Schmitt signal recovery module which are mutually connected in series.
The first switch and the second switch are switching devices and can be replaced by other switching devices (a triode, a MOS tube, a relay and the like), and U1 and U2 are switch control circuits, wherein U2 has signal reversal effect. The power supply end is a power supply end which supplies direct current.
The working principle of the transmission circuit is as follows: when the signal input by the signal input end is high level, the switch control unit outputs high to enable the first switch to be conducted, the signal reverse control unit enables the second switch to be closed due to reverse action, and the direct-current power supply input end is output from the positive output end through the first switch; when the signal input by the signal input end is low level, the switch control unit outputs low to close the first switch, the signal reverse control unit conducts the second switch due to reverse action, and the second switch short-circuits the positive output line end and the negative output line end.
The second switch, the signal inversion control unit and the first resistor are optional parts, the second switch and the signal inversion control unit can be omitted in low-speed application, and U2 and Q2 are preferably used for quickly releasing charges in high-speed application, so that the line switching speed is improved. Preferably, the first resistor may make the line waveform more stable.
And a rectification filter module consisting of a diode and a second capacitor converts the pulsating current into relatively stable direct current to be supplied to rear-end equipment for use.
A differential circuit consisting of a third resistor and a third capacitor extracts a sudden change part of the input end pulse; the fourth resistor and the fifth resistor are voltage dividing resistors, 1/2 power supply voltage is taken, and a Schmidt trigger (model HD74HCT1G14CM) is a signal processing circuit.
Preferably, the second resistor may improve line voltage stability.
The working principle of the receiving circuit is as follows: the sending circuit is in a high-level output state at ordinary times, the current of the receiving circuit charges the second capacitor through the diode, and the work of the receiving end equipment is maintained, because of the blocking effect of the third capacitor, the voltage of the input end of the Schmitt trigger is 1/2 power supply voltage divided by the resistors, and the voltage of the signal output line is maintained unchanged. The sending circuit is switched from high level to low level, the voltage of the input end is changed into 0, the diode prevents the voltage of the second capacitor from being output reversely due to the unidirectional conduction function, and the equipment power supply depends on the electric quantity stored in the second capacitor to maintain work; the differential circuit formed by the third resistor and the third capacitor converts the high level of the input end into the low level signal and converts the low level signal into the negative pulse, and when the amplitude of the negative pulse exceeds the low level window of the Schmidt signal recovery module, the signal end becomes the low level. On the contrary, when the sending circuit is converted from low level to high level, the voltage at the input end of the receiving circuit becomes high, the second capacitor is charged through the diode, the differential circuit (differential signal extraction module) formed by the third resistor and the third capacitor converts the signal at the input end from low level to high level into positive pulse, and the amplitude of the positive pulse exceeds the high level window of the Schmidt signal recovery module, the signal end becomes high level. The receiving circuit recovers the signal of the transmitting circuit.
Claims (8)
1. Low-cost direct current carrier circuit system, its characterized in that: the device comprises a transmitting circuit and a receiving circuit, wherein the transmitting circuit and the receiving circuit are connected through a power line; the receiving circuit comprises a positive input end (1) and a negative input end (2) which are respectively connected with a power line, a second resistor (3) is arranged between the positive input end (1) and the negative input end (2), a power supply rectification filtering module (4) and a differential signal extraction module (5) are connected in parallel between the second resistor (3) and the positive input end (1), and the differential signal extraction module (5) is further connected with a Schmidt signal recovery module (6) in series.
2. The low cost dc carrier circuitry of claim 1, wherein: the power supply rectification and filtering module (4) comprises a diode (401) and a second capacitor (402) which are sequentially connected in series, and a direct-current power supply output end (403) is arranged between the diode (401) and the second capacitor (402).
3. The low cost dc carrier circuitry of claim 1, wherein: the differential signal extraction module (5) is sequentially connected with a third resistor (501) and a third capacitor (502) in series.
4. The low cost dc carrier circuitry of claim 1, wherein: the Schmitt signal recovery module (6) comprises a Schmitt trigger (601) connected with the differential signal extraction module (5) in series, the input end of the Schmitt trigger (601) is provided with a fourth resistor (602) and a fifth resistor (603) which are connected in parallel, and the output end of the Schmitt trigger (601) is provided with a signal output line terminal (604).
5. The low cost dc carrier circuitry of claim 1, wherein: the transmitting circuit comprises a switch module (7), and a switch driving module (8) is connected in parallel on the switch module (7).
6. The low cost dc carrier circuitry of claim 5, wherein: the switch module (7) comprises a direct-current power supply input end (701) and a grounding end (702), a first switch (703) and a second switch (704) are sequentially connected in series between the direct-current power supply input end (701) and the grounding end (702), a positive output line end (705) and a negative output line end (706) are connected in parallel between the first switch (703) and the second switch (704), and a first resistor (707) is connected in series on the negative output line end (706); a first capacitor (708) is connected in parallel between the direct current power supply input end (701) and the first switch (703).
7. The low cost dc carrier circuitry of claim 6, wherein: the positive output line terminal (705) and the negative output line terminal (706) are respectively connected with a power line.
8. The low cost dc carrier circuitry of claim 6, wherein: the switch driving module (8) comprises a switch control unit (801) and a signal reversal switch control unit (802) which are connected in series, and a signal input end (803) is connected between the switch control unit (801) and the signal reversal switch control unit (802); the output end of the switch control unit (801) is connected with the control end of the first switch (703), and the output end of the signal reversal switch control unit (802) is connected with the control end of the second switch (704).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922431573.0U CN210780784U (en) | 2019-12-30 | 2019-12-30 | Low-cost direct current carrier circuit system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922431573.0U CN210780784U (en) | 2019-12-30 | 2019-12-30 | Low-cost direct current carrier circuit system |
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| CN210780784U true CN210780784U (en) | 2020-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868243A (en) * | 2019-12-30 | 2020-03-06 | 浙江晶日科技股份有限公司 | Low-cost direct current carrier circuit system and using method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868243A (en) * | 2019-12-30 | 2020-03-06 | 浙江晶日科技股份有限公司 | Low-cost direct current carrier circuit system and using method |
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