CN100517928C - Power supply converter and satellite receiving system - Google Patents
Power supply converter and satellite receiving system Download PDFInfo
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- CN100517928C CN100517928C CNB200610162453XA CN200610162453A CN100517928C CN 100517928 C CN100517928 C CN 100517928C CN B200610162453X A CNB200610162453X A CN B200610162453XA CN 200610162453 A CN200610162453 A CN 200610162453A CN 100517928 C CN100517928 C CN 100517928C
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Abstract
The invention discloses a power inverter, essentially comprising a first switchover voltage converter, a plurality of linear voltage converters, and a second switchover voltage converter, wherein one end of the first switchover voltage converter is respectively electrically connected with every input and the other end is electrically connected with an output; one end of the linear voltage converters are electrically connected with the input; one end of the second switchover voltage converter is connected in series with the linear voltage converters and the other end is electrically connected with the output.
Description
Technical field
The present invention relevant a kind of power supply changeover device, the particularly power supply changeover device of relevant a kind of satellite frequency demultiplier.
Background technology
The satellite communication service reaches characteristics such as not being subjected to the region restriction owing to have high frequency range, therefore has vast consumer market demand.Fig. 1 shows the functional block diagram of satellite receiving system 10, it mainly comprises a frequency demultiplier (LowNoise Block down-converter, LNB) 11, a plurality of station selector (Integrated Receiver Decoder, IRD is called again and integrates Rcv decoder) 13A, 13B ... 13M, and a plurality of display unit 15A, 15B ... 15M.Frequency demultiplier 11 is satellite signals Sat1, the Sat2 in order to receiving ... SatN gives frequency reducing, and its thin portion functional block diagram as shown in Figure 2.Frequency demultiplier 11 mainly comprises the two large divisions: one is power supply changeover device (regulator, or be called adjuster) 110, its input port Port1, Port2 ... PortM receives respectively from station selector 13A, 13B ... the power supply input of 13M is also changed (or adjustment); Another is a frequency down circuit 112, and it is the power supply of being changed from power supply changeover device 110 that its power supply is supplied with, and satellite signals Sat1, Sat2 ... SatN then is sent to each station selector 13A, 13B after frequency reducing ... 13M.
Consult Fig. 1 again, station selector 13A, 13B ... 13M receives behind the satellite signals of frequency reducing, then carries out demodulation (demodulation).In addition, station selector 13A, 13B ... 13M is also by Port1, Port2 ... PortM sends the channel selection signal and supply power is given frequency demultiplier 11.Satellite signals through demodulation then pass through Port1, Port2 ... PortM and by each station selector (13A, 13B ... 13M) deliver to display unit (15A, 15B respectively ... 15M) do the demonstration of image.
Fig. 1, satellite receiving system 10 shown in Figure 2, its frequency demultiplier 11 itself does not possess power supply, but by station selector 13A, 13B ... 13M provides power supply, again the power supply changeover device in frequency demultiplier 11 110 change with offer frequency demultiplier 11 itself particularly frequency down circuit 112 use.Because the demand of satellite communication service is cumulative, make the functional requirement of frequency demultiplier 11 also and then increase.For example, need to increase satellite signals Sat1, the Sat2 of frequency demultiplier 11 ... the SatN number N perhaps increases the number of users that it connected, also, and station selector 13A, 13B ... the number M of 13M.Yet, because station selector 13A, 13B ... 13M more toward the result of miniaturization development, makes that the power supply that it provided is often limited to, and more can't follow functional requirement and increases.Therefore, under the objective environment of this kind limitation, the conversion efficiency that how to promote power supply changeover device 110 promptly becomes a significant design and considers.
Fig. 3 A to Fig. 3 D shows several possible simplification circuit diagram of conventional power source transducer 110.Fig. 3 A shows that it adopts linear formula electric pressure converter (linear voltage regulator) (1100A, 1100B ... 1100M), it is via input port Port1, Port2 ... PortM receives respectively from station selector 13A, 13B ... the power supply of 13M offers frequency down circuit 112 again as power supply after importing and being changed.In this manual, the definition of linear formula electric pressure converter one speech is a common usage of deferring to electrical engineering.Also promptly, but the circuit that linear formula electric pressure converter is a kind of regulated output voltage, and its stabiliser is to control the element with variableimpedance (variable resistance), for example a transistor with a part of feedback of output voltage or its; Because this kind electric pressure converter is the transistorized range of linearity pattern (linear mode) that works in, therefore be called linear formula electric pressure converter.Because linear formula electric pressure converter 1100A, 1100B ... the conversion efficiency of 1100M is poor, so the power supply changeover device shown in Fig. 3 A 110 is not suitable in the system of high current consumption requirements.
Fig. 3 B shows that it adopts switch type electric voltage converter (switching voltage regulator) 1102A, 1102B ... 1102M, it is via input port Port1, Port2 ... PortM receives respectively from station selector 13A, 13B ... the power supply of 13M offers frequency down circuit 112 again as power supply after importing and being changed.In this manual, the definition of switch type electric voltage converter one speech is a common usage of deferring to electrical engineering.Also be, but switch type electric voltage converter is a kind of circuit of regulated output voltage, its stabiliser is to produce an adjustable full employment cycle (adjustable duty cycle) signal according to output voltage or its some, switches element, for example transistor in order to control one; Because with the conducting of switching transistor whether this kind electric pressure converter is control, therefore is called switch type electric voltage converter.With respect to linear formula electric pressure converter 1100A, 1100B ... 1100M, switch type electric voltage converter 1102A, 1102B ... the conversion efficiency of 1102M is higher; Yet, because switch type electric voltage converter 1102A, 1102B ... the area of 1102M is big and price is also higher, so the power supply changeover device shown in Fig. 3 B 110 has the higher disappearance of cost.
The power supply changeover device 110 that Fig. 3 C shows, it is held concurrently and adopts linear formula electric pressure converter 1104A, 1104B ... 1104M and switch type electric voltage converter 1106, thereby had concurrently advantages such as conversion efficiency is higher, cost is lower, area is less.Yet, because the input voltage of switch type electric voltage converter 1106 can be by linear formula electric pressure converter 1104A, 1104B ... the export-restriction of 1104M is lived, make to diminish, therefore make that the lifting of switch type electric voltage converter 1106 conversion efficiencies is limited across the pressure reduction at switch type electric voltage converter 1106 two ends; In other words, the power supply changeover device 110 of Fig. 3 C and fail to give full play of switch type electric voltage converter 1106 due conversion efficiencies.
The power supply changeover device 110 that Fig. 3 D shows, it omits linear formula electric pressure converter overcoming the disappearance of Fig. 3 C, however the power supply changeover device 110 shown in Fig. 3 D but has unbalanced phenomenon; Also promptly, as a certain input port Port1, Port2 ... or the voltage of PortM input is when being greater than the voltage input of other input ports, and then the supply of whole power supply is with bias voltage may the greater, and the distribution that makes power supply supply with produces unbalanced phenomena.
In view of top described, need badly and propose a kind of power supply changeover device, not only have the circuit conditioning degree, cost is low, area is little and conversion efficiency can be come highly than traditional power supply changeover device, to deal with the greater functionality demand of satellite communication service.
Summary of the invention
One of purpose of the present invention is to provide a kind of power supply changeover device, the distribution that it can euqalizing current and reach bigger conversion efficiency.
According to above-mentioned purpose, the invention provides a kind of power supply changeover device, it comprises: a plurality of input ports, in order to import a power supply respectively; One output is in order to provide a conversion electric power; One first switch type electric voltage converter, one end are electrically connected at this a plurality of input ports respectively, and its other end is electrically connected at this output; A plurality of linear formula electric pressure converters, an end of these a plurality of linear formula electric pressure converters is electrically connected at this a plurality of input ports respectively, and should be connected one to one with these a plurality of input ports by linearity formula electric pressure converter; And one second switch type electric voltage converter, it is connected with these a plurality of linear formula electric pressure converters, and an end of second switch type electric voltage converter is electrically connected at the other end of these a plurality of linear formula electric pressure converters respectively, and the other end of second switch type electric voltage converter then is electrically connected at this output.
According to above-mentioned purpose, the present invention also provides a kind of power supply changeover device of satellite receiving system, and it comprises: a plurality of input ports, with a plurality of station selectors one to one mode import a power supply from these a plurality of station selectors respectively; One output is in order to provide a conversion electric power to a frequency down circuit; One first switch type electric voltage converter, one end are electrically connected at this a plurality of input ports respectively, and its other end is electrically connected at this output; A plurality of linear formula electric pressure converters, an end of these a plurality of linear formula electric pressure converters is electrically connected at this a plurality of input ports respectively, and should be connected one to one with these a plurality of input ports by linearity formula electric pressure converter; And one second switch type electric voltage converter, it is connected with these a plurality of linear formula electric pressure converters, and an end of second switch type electric voltage converter is electrically connected at the other end of these a plurality of linear formula electric pressure converters respectively, and the other end of second switch type electric voltage converter then is electrically connected at this output.
According to above-mentioned purpose, the present invention also provides a kind of satellite receiving system, comprises: a plurality of station selectors, and it provides a power supply respectively; One frequency demultiplier is imported a plurality of satellite signals, and this frequency demultiplier comprises a power supply changeover device.This power supply changeover device comprises: a plurality of input ports, with these a plurality of station selectors one to one mode import the power supply that these a plurality of station selectors provide respectively; One output is in order to provide a conversion electric power; One first switch type electric voltage converter, one end are electrically connected at this a plurality of input ports respectively, and its other end is electrically connected at this output; A plurality of linear formula electric pressure converters, an end of these a plurality of linear formula electric pressure converters is electrically connected at this a plurality of input ports respectively, and should be connected one to one with these a plurality of input ports by linearity formula electric pressure converter; And one second switch type electric voltage converter, it is connected with these a plurality of linear formula electric pressure converters, and an end of second switch type electric voltage converter is electrically connected at the other end of these a plurality of linear formula electric pressure converters respectively, and the other end of second switch type electric voltage converter then is electrically connected at this output.
Description of drawings
Fig. 1 is the functional block diagram of satellite receiving system;
Fig. 2 is the thin portion functional block diagram of the frequency demultiplier of Fig. 1;
Fig. 3 A to Fig. 3 D is several possible simplification circuit diagram of conventional power source transducer;
Fig. 4 A is the power supply changeover device of the embodiment of the invention;
Fig. 4 B is locally supplied power source's transducer of one of them input port of Fig. 4 A;
Fig. 5 is local conventional power source transducer.
Embodiment
The embodiment of the invention is to be illustration with the satellite receiving system, its functional block diagram and earlier figures 1, Fig. 2 are identical, except the power supply changeover device of the embodiment of the invention and traditional power supply changeover device (Fig. 2 110) are different, the explanation before the content of satellite receiving system 10 will be continued to use and not repeating them here.Though the power supply changeover device that present embodiment disclosed is frequency demultiplier (the Low NoiseBlock down-converter that is applied in the satellite receiving system 10, LNB) 11, yet the present invention is equally applicable to other electronic system, work as particularly that the power supply of being imported is limited to and desire when promoting the conversion efficiency of power supply changeover device, to deal with the greater functionality demand of electronic system.
Fig. 4 A shows the power supply changeover device 40 of the embodiment of the invention.In the present embodiment, power supply changeover device (regulator, or be called adjuster) 40 have four input port Port1, Port2, Port3, Port4 in order to receive station selector, as 13A, the 13B of Fig. 1 from four user sides ... power supply input and changed or adjusted; (V3 I3) then supplies with as shown in Figure 2 frequency down circuit 112 to power supply after conversion.Though be four input ports in the present embodiment, yet the number of input port is not limited thereto.
Locally supplied power source's transducer 40 ' of one of them input port of Fig. 4 B displayed map 4A below will be primarily aimed at this locally supplied power source's transducer 40 ' and explain.The pairing power supply changeover device 40 ' of each input port comprises a linear formula electric pressure converter (linear voltage regulator) 401, first switch type electric voltage converter (switching voltage regulator) 403, second switch type electric voltage converter 405.Wherein, first switch type electric voltage converter 403 is electrically connected between input port Port1 and the output terminals A, and linear formula electric pressure converter 401 also is to be electrically connected between input port Port1 and the output terminals A after connecting with second switch type electric voltage converter 405.Here alleged " electric connection " is meant and is to each other the relation of the conducting on electric not to be the direct connection on the entity to each other yet do not limit.After the input power supply process conversion of linear formula electric pressure converter 401 of input port Port1 input, can export a fixed voltage, for example 9V (volt).The conversion efficiency of first switch type electric voltage converter 403 and second switch type electric voltage converter 405 gets high than linear formula electric pressure converter 401; Moreover, because the input voltage of first switch type electric voltage converter 403 is not lived by the export-restriction of linear formula electric pressure converter 401, therefore the pressure reduction across first switch type electric voltage converter, 403 two ends will be greater than second switch type electric voltage converter 405, therefore, the conversion efficiency of first switch type electric voltage converter 403 is promoted greatly.In addition, locally supplied power source's transducer 40 ' also comprises first resistor R 1 and second resistor R 2.The former is electrically connected between first switch type electric voltage converter 403 and the output, and the latter then is electrically connected between second switch type electric voltage converter 405 and the output.First switch type electric voltage converter 403 and second switch type electric voltage converter 405 can further carry out the distribution of electric current I 1, I2 by the resistance size of adjusting first resistor R 1, second resistor R 2.Compared to conventional power source transducer (shown in Fig. 3 A to Fig. 3 C), the power supply changeover device 40 ' of the embodiment of the invention not only can be taken into account the equilibrium that electric current distributes, and can also reach bigger conversion efficiency to provide bigger electric current I 3 to as shown in Figure 2 frequency down circuit 112.
The power supply changeover device 40 of Fig. 4 A also includes diode (D1 to D8) can follow same direction in order to the voltage or the signal of guiding each input port Port1 to Port4, to avoid having between each input port Port1 to Port4 the situation of adverse current conducting.Wherein, the first diode D1, D3, D5, D7 are electrically connected at respectively between input port Port 1, Port2, Port 3, Port4 and first switch type electric voltage converter 403, make electric signal from a certain input port, for example Port1 is toward the direction guiding conduction of first switch type electric voltage converter 403, and can adverse current to other input ports, for example Port2, Port3, Port4.In addition, also have the second diode D2, D4, D6, D8 to be electrically connected at respectively between the linear formula electric pressure converter 401 and second switch type electric voltage converter 405, make electric signal from a certain linear formula electric pressure converter, for example the output of the pairing linear formula electric pressure converter 401 of input port Port1 is toward the direction guiding conduction of second switch type electric voltage converter 405, and can adverse current to other linear formula electric pressure converters, for example Port2, Port3, the pairing linear formula electric pressure converter 401 of Port4).
Among Fig. 4 B, the input voltage of input port Port1 is except as the input power supply, and also with the usefulness as the channel selection signal, it has two kinds of high pressure channel selection signal and low pressure channel selection signals usually.For example, in the satellite receiving system, 14.5-21V is as high pressure channel selection signal usually, and 9.5-14V is then as low pressure channel selection signal.By the channel selection signal of these two kinds of different potentials, 15V for example, 11V represents the high pressure channel selection signal of 15V and the low pressure channel selection signal of 11V, therefore can select two kinds of different satellite signals (satellite programming) in order to control.Usually, also can add a low frequency pulse wave signal, for example the pulse wave signal of 22k hertz at aforesaid high pressure and above the low pressure channel selection signal; Producing four kinds of signals according to having or not of this low frequency pulse wave signal makes up, also be, low pressure channel selection signal, low pressure channel selection signal+pulse wave signal, high pressure channel selection signal, high pressure channel selection signal+pulse wave signal, thereby can carry out the selection of four satellite signals (satellite programming).Inductor L1 to L8 among Fig. 4 A, Fig. 4 B, capacitor C1 to C4, resistor R 3 to R6 promptly are in order to detecting the electronic component that low frequency pulse wave signal has or not, and the conversion of itself and power supply does not have direct correlation; Detecting about low frequency pulse wave signal is the prior art of general satellite receiving system, therefore here will not give unnecessary details.
In order to show the effect of the embodiment of the invention, below will be respectively draw its conversion efficiency with as a comparison at the power supply changeover device 40 ' (shown in Fig. 4 B) of the embodiment of the invention and conventional power source transducer 110 ' (as shown in Figure 5, it is similar to the local circuit of Fig. 3 C).
Consult Fig. 4 B, the output voltage V 3 that the input voltage of input port Port1 is assumed to be 15V, output terminals A is 800mA for 5V, output current I3.After input voltage has passed through the pressure drop of diode D1, become 14.4V in the voltage V4 of Node B, electric current I 4 then can be estimated and obtain an initial value; Passed through the pressure drop of linear formula electric pressure converter 401, diode D2 and resistor R 3 as for input voltage after, become 8.4V, and electric current I 5 can be estimated also and obtains an initial value in the magnitude of voltage V5 of node C.When circuit design, can therefore can extrapolate the output voltage range of first switch type electric voltage converter 403 and second switch type electric voltage converter 405 respectively according to the Node B of prior estimation and node C magnitude of voltage and electric current I 4, I5 initial value.In the present embodiment, the magnitude of voltage V1 that can be extrapolated node D by voltage V4 is 5.6V, is 5.5V and voltage V5 can extrapolate the magnitude of voltage V2 of node E.In the present embodiment, we do the electric current distribution for first half circuit paths and Lower Half circuit paths, make that electric current I 1 value is that 600mA and current value I 2 are 200mA (distribution about electric current will be described in detail in the back).According to electrical principles formula (1), (2):
(V1-V3)/I1＝R1 (1)
(V2-V3)/I2＝R2 (2)
And the resistance of trying to achieve resistance R 1 is the resistance of 1 Ω (ohm), resistance R 2 is 2.5 Ω.
Then, according to I1 that tries to achieve and I2 current value, and according to existing switch type electric voltage converter power conversion formula:
V4*I4*efficiency＝V1*I1 (3)
V5*I5*efficiency＝V2*I2 (4)
Known numerical value: V4=14.4V, V5=8.4V, conversion efficiency (efficiency) are assumed to be general 80%, V1=5.6V, V2=5.5V, I1=600mA, I2=200mA substitution formula (3), (4), thereby obtain I4=291mA, I5=163mA.Can learn in the present embodiment after the current value addition with I4 and I5 that it can be 800mA at node A output current I3 just that the input current value of input port Port1 only needs 454mA.
As can be known at the beginning of design circuit, at first determine the magnitude of voltage V3 and the current value I 3 of required output by above explanation, then try to achieve magnitude of voltage and the electric current initial value of Node B and node C according to the input voltage of Port1, and the magnitude of voltage of acquisition node D and node E.Expected the current value size of distributing according to the circuit paths of the first half and Lower Half then, and determine respectively two in the path R1 and the resistance of R2.At last, obtain electric current I 4 and electric current I 5 by switch type electric voltage converter power conversion formula to calculating again.
Generally speaking, power supply changeover device 40 ' in 4B figure must output magnitude of current I3 higher, so first half circuit paths must supply the shared ratio of the magnitude of current with regard to higher (because the current conversion efficient of first half circuit paths is higher), and the magnitude of current ratio just lower (the current conversion efficient because of the Lower Half circuit paths is lower) that Lower Half circuit paths institute must supply.If the magnitude of current that power supply changeover device 40 ' institute must output is not high, so the magnitude of current ratio that first half circuit paths institute must supply will with the Lower Half circuit the palpus magnitude of current ratio of supplying comparatively approaching.For instance, if the output valve of expectation electric current I 3 is 800mA, then can power taking the value of stream I1 then be 600mA, the value of electric current I 2 then is 200mA, that is the ratio of electric current I 1 and electric current I 2 is 3: 1.If the output valve of expectation electric current I 3 is 600mA, then can power taking the value of stream I1 then be 400mA, the value of electric current I 2 then is 100mA, that is the ratio of electric current I 1 and electric current I 2 is 2: 1.
Then, the conventional power source transducer 110 ' at Fig. 5 calculates its conversion efficiency.Same, the output voltage V 3 that the input voltage of input port Port1 is assumed to be 15V, output F is 800mA for 5V, output current I3.Input voltage becomes 8.4 volts in the magnitude of voltage V5 of node G after having passed through the pressure drop of linear formula electric pressure converter 1104A, diode D2 and resistor R 3.The conversion efficiency (efficiency) of supposing switch type electric voltage converter 1106 is generally 80%, according to following switch type electric voltage converter power conversion formula (5):
V5*I5*efficiency＝V3*I3 (5)
Can be about 595mA in the hope of the input current I5 of switch type electric voltage converter 1106.That is to say that when output current value that this power supply changeover device 110 ' provided was 800mA, then the input current of input port Port1 needed up to 595mA.Compare with the input current 454mA of Fig. 4 B, the embodiment of the invention has conversion efficiency preferably as can be known.Therefore, if the electric current of the identical size of input, the embodiment of the invention output current that convertible generation is bigger then, and dealt with the greater functionality demand of satellite communication service.
The above is preferred embodiment of the present invention only, is not in order to limit the present invention; All other do not break away from the change or the modification of the equivalence of being finished under the disclosed spirit, all should be included in following the application's claim scope.
Claims (17)
1. power supply changeover device comprises:
A plurality of input ports are in order to import a power supply respectively;
One output is in order to provide a conversion electric power;
One first switch type electric voltage converter, one end are electrically connected at this a plurality of input ports respectively, and its other end is electrically connected at this output;
A plurality of linear formula electric pressure converters, an end of these a plurality of linear formula electric pressure converters is electrically connected at this a plurality of input ports respectively, and these a plurality of linear formula electric pressure converters are connected one to one with these a plurality of input ports; And
One second switch type electric voltage converter, it is connected with these a plurality of linear formula electric pressure converters, and an end of second switch type electric voltage converter is electrically connected at the other end of these a plurality of linear formula electric pressure converters respectively, and the other end of second switch type electric voltage converter then is electrically connected at this output.
2. power supply changeover device as claimed in claim 1, it is characterized in that also comprising a plurality of first diodes, each this first diode is electrically connected at respectively between this input port and this first switch type electric voltage converter, make electric signal conduction from each this input port toward the direction guiding of this first switch type electric voltage converter, and can adverse current to other input ports.
3. power supply changeover device as claimed in claim 1, it is characterized in that also comprising a plurality of second diodes, these a plurality of second diodes are electrically connected at respectively between these a plurality of linear formula electric pressure converters and this second switch type electric voltage converter, and these a plurality of second diodes are to be connected one to one with these a plurality of linear formula electric pressure converters, make electric signal from each should linearity formula electric pressure converter output toward the direction guiding conduction of this second switch type electric voltage converter, and can adverse current to other linear formula electric pressure converters.
4. power supply changeover device as claimed in claim 1 is characterized in that also comprising one first resistor and is electrically connected between this first switch type electric voltage converter and this output.
5. power supply changeover device as claimed in claim 4 is characterized in that also comprising one second resistor and is electrically connected between this second switch type electric voltage converter and this output.
6. the power supply changeover device of a satellite receiving system comprises:
A plurality of input ports, with a plurality of station selectors one to one mode import a power supply from these a plurality of station selectors respectively;
One output is in order to provide a conversion electric power to a frequency down circuit;
One first switch type electric voltage converter, one end are electrically connected at this a plurality of input ports respectively, and its other end is electrically connected at this output;
A plurality of linear formula electric pressure converters, an end of these a plurality of linear formula electric pressure converters is electrically connected at this a plurality of input ports respectively, and these a plurality of linear formula electric pressure converters are connected one to one with these a plurality of input ports; And
One second switch type electric voltage converter, it is connected with these a plurality of linear formula electric pressure converters, and an end of second switch type electric voltage converter is electrically connected at the other end of these a plurality of linear formula electric pressure converters respectively, and the other end of second switch type electric voltage converter then is electrically connected at this output.
7. as the power supply changeover device of satellite receiving system as described in the claim 6, it is characterized in that also comprising a plurality of first diodes, each this first diode is electrically connected at respectively between this input port and this first switch type electric voltage converter, make electric signal conduction from each this input port toward the direction guiding of this first switch type electric voltage converter, and can adverse current to other input ports.
8. as the power supply changeover device of satellite receiving system as described in the claim 6, it is characterized in that also comprising a plurality of second diodes, these a plurality of second diodes are electrically connected at respectively between these a plurality of linear formula electric pressure converters and this second switch type electric voltage converter, and these a plurality of second diodes are to be connected one to one with these a plurality of linear formula electric pressure converters, make electric signal from each should linearity formula electric pressure converter output toward the direction guiding conduction of this second switch type electric voltage converter, and can adverse current to other linear formula electric pressure converters.
9. as the power supply changeover device of satellite receiving system as described in the claim 6, it is characterized in that also comprising one first resistor and be electrically connected between this first switch type electric voltage converter and this output.
10. as the power supply changeover device of satellite receiving system as described in the claim 9, it is characterized in that also comprising one second resistor and be electrically connected between this second switch type electric voltage converter and this output.
11. a satellite receiving system comprises:
A plurality of station selectors, it provides a power supply respectively;
One frequency demultiplier is imported a plurality of satellite signals, and this frequency demultiplier comprises a power supply changeover device, and it comprises:
A plurality of input ports, with these a plurality of station selectors one to one mode import the power supply that these a plurality of station selectors provide respectively;
One output is in order to provide a conversion electric power;
One first switch type electric voltage converter, one end are electrically connected at this a plurality of input ports respectively, and its other end is electrically connected at this output;
A plurality of linear formula electric pressure converters, an end of these a plurality of linear formula electric pressure converters is electrically connected at this a plurality of input ports respectively, and these a plurality of linear formula electric pressure converters are connected one to one with these a plurality of input ports; And
One second switch type electric voltage converter, it is connected with these a plurality of linear formula electric pressure converters, and an end of second switch type electric voltage converter is electrically connected at the other end of these a plurality of linear formula electric pressure converters respectively, and the other end of second switch type electric voltage converter then is electrically connected at this output.
12. satellite receiving system as claimed in claim 11 is characterized in that also comprising a plurality of display unit, is connected to this station selector in man-to-man mode.
13. satellite receiving system as claimed in claim 11 is characterized in that described frequency demultiplier also comprises a frequency down circuit, receives this conversion electric power, and reduces the frequency of described a plurality of satellite signals.
14. satellite receiving system as claimed in claim 11, it is characterized in that also comprising a plurality of first diodes, each this first diode is electrically connected at respectively between this input port and this first switch type electric voltage converter, make electric signal conduction from each this input port toward the direction guiding of this first switch type electric voltage converter, and can adverse current to other input ports.
15. satellite receiving system as claimed in claim 11, it is characterized in that also comprising a plurality of second diodes, these a plurality of second diodes are electrically connected at respectively between these a plurality of linear formula electric pressure converters and this second switch type electric voltage converter, and these a plurality of second diodes are to be connected one to one with these a plurality of linear formula electric pressure converters, make electric signal from each should linearity formula electric pressure converter output toward the direction guiding conduction of this second switch type electric voltage converter, and can adverse current to other linear formula electric pressure converters.
16. satellite receiving system as claimed in claim 11 is characterized in that also comprising one first resistor and is electrically connected between this first switch type electric voltage converter and this output.
17. satellite receiving system as claimed in claim 16 is characterized in that also comprising one second resistor and is electrically connected between this second switch type electric voltage converter and this output.
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| CNB200610162453XA CN100517928C (en) | 2006-11-14 | 2006-11-14 | Power supply converter and satellite receiving system |
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| CNB200610162453XA CN100517928C (en) | 2006-11-14 | 2006-11-14 | Power supply converter and satellite receiving system |
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| CN100517928C true CN100517928C (en) | 2009-07-22 |
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| US5477132A (en) * | 1992-01-10 | 1995-12-19 | Space Systems/Loral, Inc. | Multi-sectioned power converter having current-sharing controller |
| US6031747A (en) * | 1999-08-02 | 2000-02-29 | Lockheed Martin Missiles & Space Company | Interleaved synchronous flyback converter with high efficiency over a wide operating load range |
| CN1633742A (en) * | 2002-02-19 | 2005-06-29 | 皇家飞利浦电子股份有限公司 | N-phase integrated buck converter |
| CN1767338A (en) * | 2004-10-26 | 2006-05-03 | 美国凹凸微系有限公司 | Controller for a DC to DC converter having linear mode and switch mode |
| JP2006204090A (en) * | 2005-01-18 | 2006-08-03 | Micrel Inc | Dual-mode voltage regulator |
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| CN101183826A (en) | 2008-05-21 |
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