CN202309847U - Coaxial cable modem and power supply circuit - Google Patents
Coaxial cable modem and power supply circuit Download PDFInfo
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- CN202309847U CN202309847U CN2011202903194U CN201120290319U CN202309847U CN 202309847 U CN202309847 U CN 202309847U CN 2011202903194 U CN2011202903194 U CN 2011202903194U CN 201120290319 U CN201120290319 U CN 201120290319U CN 202309847 U CN202309847 U CN 202309847U
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Abstract
The utility model discloses a coaxial cable modem and a power supply circuit, and the power supply circuit comprises a USB interface, a main chip and a DC-DC level converting chip (DC/DC). The main chip comprises a USB module which comprises a VBUS interface, the DC/DC is used to transform a high level power supply into a low level power supply, and the USB interface is connected with an external device, is accessed the high level power supply, and transmits the high level power supply to the VBUS interface and the DC/DC. The utility model also provides a coaxial cable modem comprising the above power supply circuit, and the coaxial cable modem enables the product cost to be reduced substantially and the product use to be simpler and more convenient.
Description
Technical field
The utility model relates to the network communications technology, particularly a kind of coaxial cable modem and power supply circuits thereof.
Background technology
Bilateral network development based on hybrid fiber/ coax, HFC (HFC, Hybrid Fiber-Coaxial) is more and more faster.Based on the bilateral network of HFC, just, on the cable TV network basis, realize broadband network with broadband access network function.During concrete the realization, the cable passage of utilization cable TV network carries out the message transmission of broadband network.
End side at the bilateral network of HFC; Adopt coaxial cable modem (Cable Modem; CM) be connected with the cable passage of cable TV network; Can know the data transmit-receive situation after the locking information of current broadband network, said locking information comprise data feedback channel lock condition, down going channel lock condition and passage locking through this coaxial cable modem.
Fig. 1 is the interface sketch map of plate behind the prior art standard coaxial cable modulator-demodulator; This coaxial cable modem comprises a power interface POWER, an Ethernet interface LAN, a USB interface USB, a SR RESET and a coaxial cable interface CABLE.Fig. 2 is the power supply block diagram that coaxial cable modem shown in Figure 1 uses external adapter; Comprise USB interface, POWER interface, DC-DC level transferring chip DC/DC (hereinafter to be referred as DC/DC), master chip, SDRAM (Synchronous Dynamic Random Access Memory, synchronous DRAM) module, Flash module and Tuner module (being the tuner module).Master chip comprises USB module, DAC (Digital-to-Analog Conversion; Digital-to-analogue conversion) module, ADC (Analog-to-DigitalConversion; Analog-to-digital conversion) module, CPU (Central Processing Unit; Central processing unit) kernel module, PLL (Phase-Locked Loop, phase-locked loop) module, PHY module (network card chip) etc.For simplified diagram, DAC module, ADC module, CPU core module, PLL module are summarized with " other modules " is unified in Fig. 2.
During through the cable passage transmitting downlink data; First line of a couplet oral-lateral (being CABLE interface among Fig. 1) downstream signal locks through Tuner; Be downconverted into and be that intermediate-freuqncy signal, intermediate frequency downstream signal are transferred to the ADC module of master chip, become digital signal with analog signal conversion; Through the CPU core module signal is carried out demodulation and protocol conversion again, transport to external equipment through USB interface or LAN oral instructions after converting ethernet signal to.Similarly; During through the cable passage transmit ascending data; The ethernet signal that external equipment is transferred to USB interface or LAN mouth carries out protocol conversion through the CPU core module, is transferred to the DAC module after the modulation, converts digital signal to analog signal transmission to first line of a couplet oral-lateral.The PLL module is at above-mentioned each module system clock that provides in service.
The power supply of coaxial cable modem shown in Figure 1 is mainly derived from two interfaces, and one is the POWER interface, and another is a USB interface.The POWER interface inserts a 5V power supply through external adapter, and this 5V power supply converts the power interface that 3.3V transfers to each module afterwards to through DC/DC.USB interface also inserts a 5V power supply through being connected with external equipment, and the VBUS interface of this 5V power delivery to USB module supplies power for the USB module separately.In addition, the USB module also comprises the USB3.3V interface, and this USB3.3V interface is connected to the 5V power supply that inserts from the POWER interface on the 3.3V power supply that DC/DC converts to.
Adopt external adapter power supply, for some powerful coaxial cable modems, can guarantee the demand of power consumption well, it is more stable that coaxial cable modem is moved.But for some power is not very big coaxial cable modem, uses the cost of external adapter power supply having increased greatly product.In addition, use external adapter power supply need adapter one end be connected with coaxial cable modem, the other end is connected with supply socket, uses not easy.
The utility model content
The utility model technical problem to be solved is: solve the problem that prior art standard coaxial cable modulator-demodulator cost is too high and use is not easy, a kind of coaxial cable modem cheaply and power supply circuits thereof are provided.
For solving the technical problem of the utility model; The utility model discloses a kind of power supply circuits of coaxial cable modem; Comprise USB interface, master chip and DC-DC level transferring chip DC/DC, said master chip comprises the USB module, and said USB module comprises the VBUS interface; Said DC/DC is used for the high level power source conversion is become low level power; Said USB interface is connected access one high level power supply with external equipment, wherein, said USB interface is with high level power delivery to said VBUS interface; And said USB interface with said high level power delivery to said DC/DC.
Preferably, said high level power supply is the 5V power supply; Said low level power is the 3.3V power supply.
Preferably, said USB module also comprises the USB3.3V interface that is connected with DC/DC, and the low level power after said DC/DC will change transfers to said USB3.3V interface.
Preferably, said power supply circuits also comprise the USB module peripheral circuit that is connected between DC/DC and the USB3.3V interface, and the low level after said DC/DC will change transfers to said USB3.3V interface through said USB module peripheral circuit.
Preferably, said master chip also comprises DAC module, ADC module, PLL module, CPU core module and the PHY module that is connected with said DC/DC; Low level power after said DC/DC will change transfers to the power interface of DAC module, the power interface of ADC module, the power interface of PLL module, the power interface of CPU core module and the power interface of PHY module respectively.
Preferably, said master chip also comprises DAC module, ADC module, PLL module, CPU core module and the PHY module that is connected with said DC/DC; Low level power after said DC/DC will change transfers to the power interface of DAC module, the power interface of ADC module, the power interface of PLL module, the power interface of CPU core module respectively; The power interface of said PHY module is off-state.
Preferably, said USB interface series limiting resistor, said current-limiting resistance one tunnel connects said VBUS interface, ground connection behind another road connection divider resistance.
For solving the technical problem of the utility model, the utility model also discloses a kind of coaxial cable modem, and said coaxial cable modem comprises above-mentioned described coaxial cable modem power supply circuits.
Preferably, said coaxial cable modem does not comprise the POWE interface.
Preferably, said coaxial cable modem does not comprise phy interface.
Compared with prior art; The utlity model has following beneficial effect: the utility model is through improving the in-line power circuit of coaxial cable modem; Make it only just can realize whole system power supply to coaxial cable modem through USB interface, and no longer need be through external adapter external power supply power supply.For some power is not very big coaxial cable modem, greatly reduces the cost of product, and it is more easy that product is used.
Description of drawings
Fig. 1 is the interface sketch map of plate behind the prior art standard coaxial cable modulator-demodulator;
Fig. 2 is the power supply block diagram that coaxial cable modem shown in Figure 1 uses external adapter;
Fig. 3 is the in-line power block diagram of the coaxial cable modem that provides of the utility model embodiment one;
Fig. 4 is the in-line power block diagram of the coaxial cable modem that provides of the utility model embodiment two;
Fig. 5 is the interface sketch map of plate behind the coaxial cable modem that provides of the utility model preferred implementation.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The power supply circuits of the coaxial cable modem that the utility model provides comprise USB interface, master chip and DC/DC; Comprise the USB module in the master chip, the USB module comprises the VBUS interface.Wherein, DC/DC is used for the high level power source conversion is become low level power.When USB interface with can insert a high level power supply after external equipment is connected; USB interface with the high level power delivery that inserts to the VBUS interface; And USB interface also with the high level power delivery that inserts to DC/DC, high level is converted to the power interface that transfers to each module on the master chip after the low level again by DC/DC.In general, the high level power supply that USB interface inserts is the 5V power supply, and the inner supply power voltage of coaxial cable modem is the 3.3V power supply.Below be two embodiment of the in-line power circuit of the coaxial cable modem that provides of the utility model.
Embodiment one
As shown in Figure 3, the in-line power block diagram of the coaxial cable modem that the utility model embodiment one provides.Shown power supply circuits comprise a USB interface, master chip, DC/DC, Flash module, SDRAM module and Tuner module.Comprise USB module, DAC module, ADC module, CPU core module, PLL module and PHY module in the master chip.For simplified diagram, DAC module, ADC module, CPU core module, PLL module are summarized with " other modules " is unified in Fig. 3.All to different power interfaces should be arranged, the voltage of each power interface is 3.3V for DAC module, ADC module, CPU core module, PLL module and PHY module.The USB module comprises a 5V voltage source interface VBUS interface and a 3.3V voltage source interface USB3.3V interface.
With USB interface and external equipment (as; Notebook, computer, mobile phone etc.) connect and insert a 5V power supply; USB interface is the VBUS interface of this 5V power delivery to USB module, and USB interface also with this 5V power delivery to DC/DC, DC/DC is used for the 5V power source conversion is become the 3.3V power supply.Transfer to power interface, the power interface of SDRAM module, the power interface of Flash module and the power interface of Tuner module of each module in the master chip behind the 3.3V power supply after DC/DC will change again respectively.Need to prove that the 3.3V power supply after DC/DC will change also transfers to the USB3.3V interface of USB module.
Because each electronic system all has own frequency bandwidth (to the restriction of signal highest frequency), signal generally all will pass through the electronic system that being transferred to correspondence after specific filter circuit filters signal again in being transferred to corresponding electronic system the time.In theory, this filter circuit can design in chip, also can design outside chip, but wiring simply generally designs filter circuit outside chip in the chip in order to make.Be applied in the present embodiment, the corresponding filter circuit of USB module is a USB module peripheral circuit.3.3V power supply after DC/DC will change transfers to USB module peripheral circuit earlier to carry out transferring to the USB3.3V interface again after the filtering.
In like manner, DAC module, ADC module, CPU core module, PLL module, SDRAM module, Flash module and Tuner module also have corresponding peripheral circuit to carry out filtering.3.3V power supply after DC/DC will change transfers to the power interface that transfers to each module behind the corresponding peripheral circuit of each module more earlier.
Need to prove that for the coaxial cable modem that does not possess Ethernet interface, can not comprise the PHY module in the master chip, when comprising the PHY module in the master chip, preferably, the power interface of this PHY module is off-state.
Embodiment two
In order to prevent the excessive impact to USB interface of coaxial cable modem electric current in the plug process, embodiment two provides a kind of circuit of protecting against shock, referring to Fig. 4.Concrete, current-limiting resistance R1 of USB interface series connection is divided into two-way, and this current-limiting resistance R1 one road is connected to the VBUS interface, ground connection behind another road connection divider resistance R2.
Because the power that USB interface provides is a fixed value basically; Be roughly 2.5W (electric current 500mA; Voltage 5V), for the coaxial cable modem of some maximum powers less than 2.5W, above-described power supply circuits can satisfy the demand of power consumption; But be slightly larger than the coaxial cable modem of 2.5W for some maximum powers, also need be through some other improvement could satisfy its power consumption demand.For example, adopt high efficiency DC/DC.
Present embodiment also provides a kind of coaxial cable modem cheaply, and this coaxial cable modem comprises above-mentioned said power supply circuits.Be illustrated in figure 5 as the interface sketch map of plate behind the coaxial cable modem that the utility model preferred implementation provides, comprise USB interface USB, coaxial cable interface CABLE and a SR RESET.Compare with the coaxial cable modem among Fig. 1, present embodiment has saved POWER interface, LAN interface and external adapter, greatly reduces cost.
Coaxial cable modem with the TNETC4600+Mx1201RF scheme is an example below, describes and adopts the power supply circuits described in embodiment one or the embodiment two, how to realize coaxial cable modem shown in Figure 5.The maximum power of this scheme is 2.6W, and actual power is about 2.2W when adopting external adapter to supply power.If directly adopt the power supply circuits described in embodiment one or the embodiment two; Suppose under the situation of current supply loss identical (0.4W); The actual power that then can provide is 2.1W; Actual power 2.2W when adopting the power supply of external adapter less than it will certainly influence the performance of coaxial cable modem.Because externally fed power can't change, and make the coaxial cable modem operate as normal, must reduce its internal power consumption, the needed actual power of its operate as normal is reduced.Particularly, can improve from the following aspects.1) 3.3V that removes master chip PHY module supplies power, and directly removes the corresponding peripheral circuit of PHY module, and disconnection PHY modular power source interface is connected with external power source.The chip data DataSheet corresponding according to the TNETC4600+Mx1201RF scheme can know that this measure can reduce power consumption 261mW.2) through register change pll parameter is set system is carried out down conversion process.Suppose the frequency of system was reduced to 52.5Mhz by former 105Mhz, can reduce 169mW through after the above-mentioned down conversion process through calculating system after the test of current/voltage testing tool.After this coaxial cable modem improved according to above-mentioned two steps, power consumption reduced 430mW altogether, and then actual power is reduced to 1.77W by original 2.2W.At this moment, be 87% DC/DC if select efficient for use, then input power is about 2.04W (actual power is divided by efficient), reserves the excess loss of 0.46W, can satisfy the power consumption requirement.
More than lift preferred embodiment; Purpose, technical scheme and advantage to the utility model have been carried out further explain, it should be understood that the above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model; The interest field that the utility model is advocated should be as the criterion so that the utility model application scope is said, but not only limits to the foregoing description.
Claims (8)
1. the power supply circuits of a coaxial cable modem; Comprise USB interface, master chip and DC-DC level transferring chip DC/DC, said master chip comprises the USB module, and said USB module comprises the VBUS interface; Said DC/DC is used for the high level power source conversion is become low level power; Said USB interface is connected access one high level power supply with external equipment, it is characterized in that, said USB interface is with high level power delivery to said VBUS interface; And said USB interface with said high level power delivery to said DC/DC.
2. power supply circuits according to claim 1 is characterized in that, said high level power supply is the 5V power supply; Said low level power is the 3.3V power supply.
3. power supply circuits according to claim 1 and 2 is characterized in that, said USB module also comprises the USB3.3V interface that is connected with DC/DC, and the low level power after said DC/DC will change transfers to said USB3.3V interface.
4. power supply circuits according to claim 3; It is characterized in that; Said power supply circuits also comprise the USB module peripheral circuit that is connected between DC/DC and the USB3.3V interface, and the low level after said DC/DC will change transfers to said USB3.3V interface through said USB module peripheral circuit.
5. power supply circuits according to claim 1 and 2 is characterized in that, said master chip also comprises DAC module, ADC module, PLL module, CPU core module and the PHY module that is connected with said DC/DC; Low level power after said DC/DC will change transfers to the power interface of DAC module, the power interface of ADC module, the power interface of PLL module, the power interface of CPU core module and the power interface of PHY module respectively.
6. power supply circuits according to claim 1 and 2 is characterized in that, said master chip also comprises DAC module, ADC module, PLL module, CPU core module and the PHY module that is connected with said DC/DC; Low level power after said DC/DC will change transfers to the power interface of DAC module, the power interface of ADC module, the power interface of PLL module, the power interface of CPU core module respectively; The power interface of said PHY module is off-state.
7. power supply circuits according to claim 1 and 2 is characterized in that, said USB interface series limiting resistor, and said current-limiting resistance one tunnel connects said VBUS interface, ground connection behind another road connection divider resistance.
8. a coaxial cable modem is characterized in that, said coaxial cable modem comprises like each described coaxial cable modem power supply circuits of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202903194U CN202309847U (en) | 2011-08-11 | 2011-08-11 | Coaxial cable modem and power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202903194U CN202309847U (en) | 2011-08-11 | 2011-08-11 | Coaxial cable modem and power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202309847U true CN202309847U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202903194U Expired - Fee Related CN202309847U (en) | 2011-08-11 | 2011-08-11 | Coaxial cable modem and power supply circuit |
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| Country | Link |
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| CN (1) | CN202309847U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614850A (en) * | 2020-04-15 | 2020-09-01 | 北京瀚诺半导体科技有限公司 | Wall-in type coaxial cable modulation and demodulation device |
| CN111614849A (en) * | 2020-04-15 | 2020-09-01 | 北京瀚诺半导体科技有限公司 | Indoor communication system based on coaxial cable |
-
2011
- 2011-08-11 CN CN2011202903194U patent/CN202309847U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614850A (en) * | 2020-04-15 | 2020-09-01 | 北京瀚诺半导体科技有限公司 | Wall-in type coaxial cable modulation and demodulation device |
| CN111614849A (en) * | 2020-04-15 | 2020-09-01 | 北京瀚诺半导体科技有限公司 | Indoor communication system based on coaxial cable |
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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 |
Granted publication date: 20120704 Termination date: 20150811 |
|
| EXPY | Termination of patent right or utility model |