1. A communications network comprising:
an originating Real Time Data over IP host;
a terminating Real Time Data over IP host;
communication control means for at least receiving information relating to a communication;
a first communication forwarding means that replaces a fixed IP address in a data packet sent from the terminating Real Time Data over IP host to the originating Real Time Data over IP host with a first dynamic IP address to conceal the fixed IP address of the terminating Real Time Data over IP host, wherein the fixed IP address of the originating Real Time Data over IP host is unknown to the first communication forwarding means; and
a second communication forwarding means that replaces a fixed IP address in a data packet from the originating Real Time Data over IP host to the terminating Real Time Data over IP host with a second dynamic IP address to conceal the fixed IP address of the originating Real Time Data over IP host, wherein the fixed IP address of the terminating Real Time Data over IP host is unknown to the second communication forwarding means,
wherein, during the setup of a communication session between the originating Real Time Data over IP host and the terminating Real Time Data over IP host, the communication control means exchanges only the dynamic IP addresses between the first and second communications forwarding means.
2. The network according to claim 1, wherein at least part of the network between one of the communication forwarding means and one of the Real Time Data over IP hosts is a Real Time Data over IP network.
3. The network according to claim 2, further comprising a plurality of communication forwarding means, wherein each of the Real Time Data over IP hosts is connected to a selected one of the communication forwarding means.
4. The network according to claim 1, wherein at least one of the communication forwarding means comprises a translation means that translates an external reference of one or both of the hosts into an internal reference.
5. The network according to claim 1, wherein at least one of the communication forwarding means further comprises tracking means for measuring at least one predefined parameter related to the communication and the communication forwarding means comprises transmitting means for transmitting the measured value to a selected data receiver.
6. The network according to claim 1, wherein at least one of the Real Time Data over IP hosts comprises message means for transmitting a message to the communication control means to indicate that a communication session is in progress.
7. A method of controlling communication on a communications network comprising an originating Real Time Data over IP host and a terminating Real Time Data over IP host between which communication is to be effected and a communication control means for receiving information relating to the communication, wherein the method comprises:
transmitting at least some data from the originating Real Time Data over IP host to a first communication forwarding means, wherein the first communication forwarding means replaces a fixed IP address in a data packet sent from the originating Real Time Data over IP host to the terminating Real Time Data over IP host with a first dynamic IP address to conceal the fixed IP address of the originating Real Time Data over IP host, and wherein the fixed IP address of the terminating Real Time Data over IP host is unknown to the first communication forwarding means;
transmitting at least some data from the terminating Real Time Data over IP host to a second communication forwarding means, wherein the second communication forwarding means replaces a fixed IP address in a data packet sent from the terminating Real Time Data over IP host to the originating Real Time Data over IP host with a second dynamic IP address to conceal the fixed IP address of the terminating Real Time Data over IP host, and wherein the fixed IP address of the originating Real Time Data over IP host is unknown to the second communication forwarding means;
using the communication forwarding means to direct communication between the Real Time Data over IP hosts; and
sending information relating to the communication from the communication forwarding means to the communication control means,
wherein, during the setup of a communication session between the originating Real Time Data over IP host and the terminating Real Time Data over IP host, the communication control means exchanges only the dynamic IP addresses between the first and second communications forwarding means.
8. A communications network comprising:
an originating Real Time Data over IP host;
a terminating Real Time Data over IP host;
a communications controller for at least receiving information relating to a communication;
a first gateway that replaces a fixed IP address in a data packet sent from the terminating Real Time Data over IP host to the originating Real Time Data over IP host with a first dynamic IP address to conceal the fixed IP address of the terminating Real Time Data over IP host, wherein the fixed IP address of the originating Real Time Data over IP host is unknown to the first gateway; and
a second gateway that replaces a fixed IP address in a data packet from the originating Real Time Data to the terminating Real Time Data over IP host with a second dynamic IP address to conceal a fixed IP address of the originating Real Time Data over IP host, wherein the fixed IP address of the terminating Real Time Data over IP host is unknown to the second gateway,
wherein, during the setup of a communication session between the originating Real Time Data over IP host and the terminating Real Time Data over IP host, the communication controller exchanges only the dynamic IP addresses between the first and second gateways.
9. The network according to claim 8, wherein at least part of the network between one of the gateways and one of the Real Time Data over IP hosts is a Real Time Data over IP network.
10. The network according to claim 9, further comprising a plurality of gateways, wherein each of the Real Time Data over IP hosts is connected to a selected one of the gateways.
11. The network according to claim 8, wherein at least one of the gateways comprises a translator that translates an external reference of one or both of the hosts into an internal reference.
12. The network according to claim 8, wherein at least one of the gateways further comprises a tracker for measuring at least one predefined parameter related to the communication and the gateway comprises a transmitter for transmitting the measured value to a selected data receiver.
13. The network according to claim 8, wherein at least one of the Real Time Data over IP hosts comprises a message transmitter for transmitting a message to the communications controller to indicate that a communication session is in progress.
14. The network according to claim 1, wherein the first and second communication forwarding means each comprise a translation means for translating a fixed IP address of a Real Time Data over IP host into a dynamic IP address.
15. The network according to claim 8, wherein the first and second gateways each comprise a translator for translating a fixed IP address of a Real Time Data over IP host into a dynamic IP address.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A motor driving device comprising:
a rectifier having at least one input terminal, a first output terminal and a second output terminal, the input terminal of the rectifier electrically connected to a power source;
a first resistor having a first terminal and a second terminal, the first terminal of the first resistor being in direct contact with the first output terminal of the rectifier;
a first capacitor having a first terminal and a second terminal, the first terminal of the first capacitor being in direct contact with the second terminal of the first resistor, the second terminal of the first capacitor being in direct contact with the second output terminal of the rectifier;
a first electronic switch connected to the first resistor in parallel, wherein one end of the first electronic switch is in direct contact with the first terminal of the first resistor, and another end of the first electronic switch is in direct contact with the second terminal of the first resistor;
a driving circuit having a first input terminal, a second input terminal and at least one output terminal, the first input terminal of the driving circuit being in direct contact with the first terminal of the first resistor, the second input terminal of the driving circuit being in direct contact with the second terminal of the first capacitor, the output terminal of the driving circuit being in direct contact with a motor; and
a power regeneration unit having first input terminal, a second input terminal and at least one output terminal, the first input terminal of the power regeneration unit electrically connected to the first terminal of the first resistor, the second input terminal of the power regeneration unit electrically connected to the second terminal of the first capacitor, the output terminal of the power regeneration unit electrically connected to the power source.
2. The motor driving device of claim 1, further comprising:
a first voltage detector for detecting a voltage of the first capacitor; and
a first controller for controlling the first electronic switch to serve as an open-circuit when the voltage of the first capacitor is lower than a first setting voltage value.
3. The motor driving device of claim 1, wherein the first resistor is grounded without through another capacitor.
4. The motor driving device of claim 1, wherein the power regeneration unit comprises:
a second resistor having a first terminal and a second terminal, the first terminal of the second resistor electrically connected to the first terminal of the first resistor;
a second capacitor having a first terminal and a second terminal, the first terminal of the second capacitor being in direct contact with the second terminal of the second resistor, the second terminal of the second capacitor being in direct contact with the second terminal of the first capacitor;
a second electronic switch connected to the second resistor in parallel, wherein one end of the second electronic switch is in direct contact with the first terminal of the second resistor, and another end of the second electronic switch is in direct contact with the second terminal of the second resistor; and
a power regeneration circuit having first input terminal, a second input terminal and at least one output terminal, the first input terminal of the power regeneration circuit being in direct contact with the first terminal of the second resistor, the second input terminal of the power regeneration circuit being in direct contact with the second terminal of the second capacitor, the output terminal of the power regeneration circuit electrically connected to the power source.
5. The motor driving device of claim 4, wherein the power regeneration unit further comprises:
a second voltage detector for detecting a voltage of the second capacitor; and
a second controller for controlling the second electronic switch to serve as an open-circuit when the voltage of the second capacitor is lower than a second setting voltage value.
6. The motor driving device of claim 4, wherein the second resistor is grounded without through another capacitor.
7. The motor driving device of claim 1, wherein the motor is connected to a load, and a rated capacity of the first capacitor depends on the load.
8. A motor driving device comprising:
a power regeneration circuit having first terminal, a second terminal and a third terminal, the first terminal of the power regeneration circuit electrically connected to a power source;
a resistor having a first terminal and a second terminal, the first terminal of the resistor being in direct contact with the second terminal of the power regeneration circuit;
a capacitor having a first terminal and a second terminal, the first terminal of the capacitor being in direct contact with the second terminal of the resistor, the second terminal of the capacitor being in direct contact with the third terminal of the power regeneration circuit;
an electronic switch connected to the resistor in parallel, wherein one end of the electronic switch is in direct contact with the first terminal of the resistor, and another end of the electronic switch is in direct contact with the second terminal of the resistor; and
a driving circuit having a first input terminal, a second input terminal and at least one output terminal, the first input terminal of the driving circuit being in direct contact with the first terminal of the resistor, the second input terminal of the driving circuit being in direct contact with the second terminal of the capacitor, the output terminal of the driving circuit being in direct contact with a motor.
9. The motor driving device of claim 8, further comprising:
a voltage detector for detecting a voltage of the capacitor; and
a controller for controlling the electronic switch to serve as an open-circuit when the voltage of the capacitor is lower than a setting voltage value.
10. The motor driving device of claim 8, wherein the resistor is grounded without through another capacitor.
11. The motor driving device of claim 8, wherein the motor is connected to a load, and a rated capacity of the capacitor depends on the load.