EXHIBIT 1007
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`EXHIBIT 1007EXHIBIT 1007
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`EXHIBIT 1007EXHIBIT 1007
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`(11) Japanese Unexamined Patent Application Publication No.
`6-189535
`(43) Publication Date: July 8, 1994
`(21) Application No. 4-163230
`(22) Application Date: June 23, 1992
`(71) Applicant: NEC Fukushima Corporation
`(72) Inventor: Hisanori SATOU
`(74) Agent: Patent Attorney, Kyoumoto et al.
`
`(54) [Title of the Invention] SWITCHING REGULATOR PROVIDED
`WITH CO-AXIAL CABLE CONNECTION PROTECTION FUNCTION
`
`
`(57) [Abstract]
` [Object] An object of the invention is to eliminate the
`risk of an electric shock hazard and a short circuit hazard
`due to misoperation in the work, poor connector connection,
`or the like at the time of the detaching of a co-axial cable
`through which the power-supplying side is connected to the
`power-consuming side with the superposing of a direct-
`current voltage onto a signal voltage, thereby ensuring
`safety.
` [Construction] An output voltage variable circuit 16 and
`a co-axial cable connection signal detection circuit 14 are
`provided inside a switching regulator 6, which is provided
`with a co-axial cable connection protection function. If
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`- 1 -
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`the co-axial cable, through which the power-supplying side
`is connected to the power-consuming side, is in a state of
`non-connection to the power-consuming side, the co-axial
`cable connection signal detection circuit 14 detects that
`there is no load current and sends a detection signal to the
`output voltage variable circuit 16 to stabilize the level of
`an output voltage at a low voltage level. When the co-axial
`cable has now been connected thereto, the co-axial cable
`connection signal detection circuit 14 detects the presence
`of a load current. A detection signal is transferred from
`the output voltage variable circuit 16 to the output voltage
`stabilization circuit 15. An output voltage is increased up
`to a high level required at the power-consuming side. It is
`outputted as a stabilized voltage.
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`- 2 -
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`[Claim]
`[Claim 1] A switching regulator provided additionally with
`a co-axial cable connection protection function for removing
`a potential short circuit hazard and a potential electric
`shock hazard at the time of detaching of a co-axial cable
`when a direct-current output voltage is sent from a power-
`supplying side to a power-load side in order to transmit
`power with superposing on the co-axial cable, through which
`a signal voltage is sent, comprising:
`
`an output voltage variable circuit that performs output
`voltage variable control in accordance with information on
`the detaching of the co-axial cable; and
`
`a co-axial cable connection detection circuit that
`detects a state of absence/presence of a load current
`corresponding to a state of the detaching of the co-axial
`cable and supplies the detaching information to the output
`voltage variable circuit.
`[Detailed Description of the Invention]
`[0001]
`[Field of Industrial Application] The present invention
`relates to a switching regulator provided additionally with
`a co-axial cable connection protection function. More
`particularly, the invention relates to a switching regulator
`provided with a co-axial cable connection protection
`function for removing a potential short circuit hazard and a
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`- 3 -
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`potential electric shock hazard at the time of the detaching
`of a co-axial cable when the direct-current voltage of the
`switching regulator is applied to a signal line utilizing a
`co-axial cable to transmit power.
`[0002]
`[Description of the Related Art] A method that is commonly
`used in the art for supplying power with the application of
`a voltage from a switching regulator to a co-axial cable
`connected to a signal line is illustrated in Fig. 4.
`[0003]
`
`Specifically, at a power-supplying side 1, a regulator
`voltage is superposed from a switching regulator 18 via a
`power line 7 onto a signal voltage on a signal line 3. This
`voltage-superposed power is transmitted to a power-consuming
`side 2 via a co-axial cable 5.
`[0004]
`
`At the power-consuming side 2, separation processing is
`performed to take out an alternating-current component onto
`a signal line 4 and a direct-current component onto a power
`line 8. The power is supplied in this way.
`[0005]
`
`As illustrated in Fig. 5, the switching regulator 6
`includes a PWM (Pulse Width Modulation) control circuit 17
`and a switching element 9 at its primary side. Its
`secondary-side output transformed by a transformer 10 is
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`- 4 -
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`rectified at a rectifier diode 11. The rectified output
`enters a smoothing filter 13 through a choke coil 12 to exit
`as a smoothened output. An output voltage stabilization
`circuit 15 detects the voltage of an output end and controls
`the PWM control circuit 17 to obtain a stable output.
`[0006]
`[Problems to be Solved by the Invention] There is a problem
`in the switching regulator according to the related art
`described above in that it is impossible to eliminate the
`risk of an electric shock hazard and a short circuit hazard
`due to misoperation in the work, poor connector connection,
`or the like at the time of the detaching of a co-axial cable.
`[0007]
`
`The present invention has been made to solve the
`problem described above. An object of the invention is to
`provide a switching regulator provided with a co-axial cable
`connection protection function that makes it possible to
`eliminate the risk of an electric shock hazard and a short
`circuit hazard at the time of the detaching of a co-axial
`cable.
`[0008]
`[Means for Solving the Problems] A switching regulator
`according to the present invention is a switching regulator
`provided additionally with a co-axial cable connection
`protection function for removing a potential short circuit
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`- 5 -
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`hazard and a potential electric shock hazard at the time of
`detaching of a co-axial cable when a direct-current output
`voltage is sent from a power-supplying side to a power-load
`side in order to transmit power with superposing on the co-
`axial cable, through which a signal voltage is sent. The
`switching regulator includes: an output voltage variable
`circuit that performs output voltage variable control in
`accordance with information on the detaching of the co-axial
`cable; and a co-axial cable connection detection circuit
`that detects a state of absence/presence of a load current
`corresponding to a state of the detaching of the co-axial
`cable and supplies the detaching information to the output
`voltage variable circuit.
`[0009]
`[Embodiment] With reference to the accompanying drawings,
`an exemplary embodiment of the present invention will now be
`explained.
`[0010]
`
`Fig. 1 is a block diagram that illustrates the overall
`configuration of an exemplary embodiment of the present
`invention. Fig. 2 is a block diagram that illustrates the
`components of a switching regulator 6 illustrated in Fig. 1.
`[0011]
`
`In the configuration of the embodiment illustrated in
`Fig. 1, at a power-supplying side 1A, a direct-current
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`- 6 -
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`voltage is superposed from a switching regulator 6, which is
`provided with a co-axial cable connection protection
`function and is connected to a signal line 3, via a power
`line 7 onto a signal voltage on the signal line 3. This
`voltage-superposed power is transmitted to a power-consuming
`side 2 via a co-axial cable 5. At the power-consuming side
`2, separation processing is performed to take out an
`alternating-current component onto a signal line 4 and a
`direct-current component onto a power line 8. The power is
`supplied in this way.
`[0012]
`
`Next, with reference to Fig. 2, the configuration of
`the switching regulator 6 provided with the co-axial cable
`connection protection function will now be explained.
`[0013]
`
`The configuration of the switching regulator 6 provided
`with the co-axial cable connection protection function is
`the same as that of the switching regulator 18 according to
`prior art illustrated in Fig. 2 except that the switching
`regulator 6 according to the present embodiment of the
`invention additionally includes an output voltage variable
`circuit 16 and a co-axial cable connection detection circuit
`14 as its inner components.
`[0014]
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`Next, the operation of the switching regulator
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`- 7 -
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`illustrated in Fig. 2 will now be explained.
`[0015]
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`If the co-axial cable 5 is not connected to the power-
`consuming side 2, it is detected at the co-axial cable
`connection signal detection circuit 14 that no electric
`current is flowing at the power-consuming side 2. A
`detection signal is sent to the output voltage variable
`circuit 16.
`[0016]
`
`In the case of the absence of a detection signal, the
`reference voltage of an operational amplifier provided
`inside the output voltage stabilization circuit 15 is
`lowered to stabilize the level of an output voltage at a low
`voltage level.
`[0017]
`
`Next, if the co-axial cable 5 has now been connected to
`the power-consuming side 2, it is detected at the co-axial
`cable connection detection circuit 14 that an electric
`current is flowing at the power-consuming side 2. A
`detection signal is sent to the output voltage variable
`circuit 16. In this case, the reference voltage of the
`operational amplifier built in the output voltage
`stabilization circuit 15 is raised. An output voltage is
`increased up to a high level required at the power-consuming
`side 2. It is outputted as a stabilized voltage. By this
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`- 8 -
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`means, it is possible to remove a potential short circuit
`hazard and a potential electric shock hazard at the time of
`the connection of a co-axial cable.
`[0018]
`
`Fig. 3 is a diagram that illustrates the
`characteristics of an output voltage according to the
`embodiment illustrated in Figs. 1 and 2.
`[0019]
`As shown in Fig. 3, the level of an output voltage VO is
`
`kept at a low voltage level VOL stably during a co-axial
`cable non-connection time period t1. The level of the
`output voltage VO is gradually raised to reach a high
`voltage level VOH, and is kept thereat stably, during a co-
`axial cable connection time period t2. Then, the level of
`the output voltage VO is gradually lowered to reach the low
`voltage level VOL, and is kept thereat stably, during a co-
`axial cable non-connection time period t3.
`[0020]
`[Advantages] As described above, in the present invention,
`it is detected whether there is a load current or not at the
`time of the detaching of a co-axial cable on which a direct-
`current voltage is superposed from a switching regulator
`onto a signal voltage. Information on the state of the
`detaching of the co-axial cable is obtained as a result of
`the detection of the presence/absence of the load current.
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`- 9 -
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`The voltage of supplied power is suppressed when the co-
`axial cable is attached. By this means, it is possible to
`eliminate the risk of an electric shock hazard and a short
`circuit hazard due to misoperation in the work, poor
`connector connection, or the like, which is an advantageous
`effect of the invention.
`[Brief Description of the Drawings]
`[Fig. 1] Fig. 1 is a block diagram that illustrates the
`overall configuration of an exemplary embodiment of the
`present invention;
`[Fig. 2] Fig. 2 is a block diagram that illustrates the
`components of a switching regulator provided with a co-axial
`cable connection protection function illustrated in Fig. 1;
`[Fig. 3] Fig. 3 is a diagram that illustrates the
`characteristics of an output voltage according to the
`embodiment illustrated in Figs. 1 and 2;
`[Fig. 4] Fig. 4 is a block diagram that illustrates the
`state of operation of a switching regulator according to
`prior art; and
`[Fig. 5] Fig. 5 is a block diagram that illustrates the
`components of the switching regulator illustrated in Fig. 4.
`[Reference Numerals]
`1, 1A power-supplying side
`2 power-consuming side
`3, 4 signal line
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`- 10 -
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`5 co-axial cable
`6 switching regulator provided with a co-axial cable
`connection protection function
`7, 8 power line
`9 switching element
`10 transformer
`11 rectifier diode
`12 choke coil
`13 smoothing filter
`14 co-axial cable connection detection circuit
`15 output voltage stabilization circuit
`16 output voltage variable circuit
`17 PWM control circuit
`18 switching regulator
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`- 11 -
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`FIG.
`
`1
`
`IA
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`POWER-SUPPLYING SIDE
`
`SIGNAL LINE
`
`POWER LINE
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`3
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`7
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`6
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`CONNECTION PROTECTION FUNCTION
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`5
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`2
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`4
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`8
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`CO-AXIAL CABLE
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`POWER-CONSUMING SIDE
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`SIGNAL LINE
`
`POWER LINE
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`FIG.
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`2
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`(l) OUTPUT
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`9
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`SWITCHING ELEMENT
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`PWM CONTROL CIRCUIT
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`CO-AXIAL CABLE CONNECTION DETECTION CIRCUIT
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`L7
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`L4
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`LO
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`L2
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`Ll
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`L3
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`L5
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`SWITCHING REGULATOR PROVIDED WITH A CO-AXIAL CABLE
`
`FIG. 1
`1A POWER-SUPPLYING SIDE
`3 SIGNAL LINE
`7 POWER LINE
`6 SWITCHING REGULATOR PROVIDED WITH A CO-AXIAL CABLE
`CONNECTION PROTECTION FUNCTION
`5 CO-AXIAL CABLE
`2 POWER-CONSUMING SIDE
`4 SIGNAL LINE
`8 POWER LINE
`
`FIG. 2
`(1) OUTPUT
`9 SWITCHING ELEMENT
`17 PWM CONTROL CIRCUIT
`14 CO-AXIAL CABLE CONNECTION DETECTION CIRCUIT
`10 TRANSFORMER
`12 CHOKE COIL
`11 RECTIFIER DIODE
`13 SMOOTHING FILTER
`15 OUTPUT VOLTAGE STABILIZATION CIRCUIT
`16 OUTPUT VOLTAGE VARIABLE CIRCUIT
`
`FIG. 3
`VO OUTPUT VOLTAGE
`
`TRANSFORMER
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`CHOKE COIL
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`RECTIFIER DIODE
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`SMOOTHING FILTER
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`OUTPUT VOLTAGE STABILIZATION CIRCUIT
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`L6
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`OUTPUT VOLTAGE VARIABLE CIRCUIT
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`FIG.
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`3
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`V0
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`OUTPUT VOLTAGE
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`- 12 -
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`t TIME
`t1 CO-AXIAL CABLE NON-CONNECTION TIME PERIOD
`t2 CO-AXIAL CABLE CONNECTION TIME PERIOD
`t3 CO-AXIAL CABLE NON-CONNECTION TIME PERIOD
`
`FIG. 4
`1A POWER-SUPPLYING SIDE
`3 SIGNAL LINE
`7 POWER LINE
`18 SWITCHING REGULATOR
`5 CO-AXIAL CABLE
`2 POWER-CONSUMING SIDE
`4 SIGNAL LINE
`8 POWER LINE
`
`FIG. 5
`(1) OUTPUT
`9 SWITCHING ELEMENT
`17 PWM CONTROL CIRCUIT
`10 TRANSFORMER
`12 CHOKE COIL
`11 RECTIFIER DIODE
`13 SMOOTHING FILTER
`15 OUTPUT VOLTAGE STABILIZATION CIRCUIT
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`- 13 -
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`VERIFIED TRANSLATION OF DOCUMENT
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`The undersigned, of the below address, hereby certifies that he well knows
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`both the English and Japanese languages, and that the attached is accurate translation
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`of the document listed below:
`
`Japanese Unexamined Patent Application Publication No. 6-189535
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`Signed this 6th day of December 17, 2012
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`Signature: Z ' fl I. '1 B
`
`Name: Katsutoshi AMANO
`
`Address: 4-8, Yotsuya, Shinjyuku—ku, Tokyo
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