Power supply control system, load apparatus and method

Abstract

This invention provides a system, load device, and method for power supply control. In the power supply control system, a power supply device supplies an initial voltage, and a load device receives the initial voltage from a first node and sends a feedback current signal to the power supply device via a second node. The load device has at least a first information feature generated by a first circuit module and a second information feature generated by a second circuit module. The power supply device detects the first information feature to determine a first power supply parameter, detects the second information feature to determine a second power supply parameter, and supplies power to the load device based on the first and second power supply parameters, wherein the first power supply parameter is one of voltage, current, or power, and the second power supply parameter is the other of voltage, current, or power.

Claims

1. A power supply control system comprising: a power supply device configured to supply an initial voltage; and a load device configured to receive the initial voltage and, in response to the initial voltage, send a feedback current signal to the power supply device, the feedback current signal having at least a first information feature and a second information feature; wherein the load device includes a feedback current signal generating module comprising: a first circuit module generating the first information feature in response to the initial voltage; and a second circuit module generating the second information feature in response to the initial voltage; wherein the power supply device is configured to: detect the first information feature to determine a first power supply parameter; detect the second information feature to determine a second power supply parameter; and supply power to the load device based on the first power supply parameter and the second power supply parameter, wherein the first power supply parameter is one of voltage, current, or power, and the second power supply parameter is the other of voltage, current, or power.

2. As in request item 1, the power supply control system, wherein: The first circuit module includes: a load resistor, a first end of which is coupled to a first node; a switching element, a first end of which is coupled to a second end of the load resistor, and a second end of which is coupled to a second node; a voltage regulator coupled to the first node, for turning off in response to a voltage level at the first node being less than a critical voltage level, and for turning on in response to a voltage level at the first node being greater than or equal to the critical voltage level; and the second circuit module includes: a control resistor, a first end of which is coupled to the second node, and a second end of which is coupled to a control terminal of the switching element; and a control capacitor coupled between the voltage regulator and the control terminal of the switching element, wherein the power supply device supplies the initial voltage to the first node and receives the feedback current signal from the second node, and wherein the initial voltage is greater than or equal to the sum of the critical voltage level and the voltage level of the switching element.

3. The power supply control system of claim 2, wherein the first information feature is a current level and the second information feature is a duration before the current level returns to zero.

4. The power supply control system as requested in item 1, wherein: The first circuit module includes: a first load resistor, one first end of which is coupled to a first node; a first switching element, one first end of which is coupled to a second end of the first load resistor, the second end of which is coupled to a first end of a first control resistor at a second node, and a control terminal of which is coupled to a second end of the first control resistor; a first voltage regulator coupled to the first node, configured to turn off in response to a voltage level at the first node being less than a first critical voltage level, and to turn on in response to a voltage level at the first node being greater than or equal to the first critical voltage level; and a first control capacitor coupled between the first voltage regulator and the control terminal of the first switching element; and the second circuit module includes: a second load resistor, one first end of which is coupled to the first node; A second switching element, one first terminal of which is coupled to a second terminal of a second load resistor, the second terminal of which is coupled to a first terminal of a second control resistor at the second node, and a control terminal of which is coupled to a second terminal of the second control resistor; a second voltage regulator coupled to the first node, for turning off in response to a voltage level at the first node being less than a second critical voltage level, and for turning on in response to a voltage level at the first node being greater than or equal to the second critical voltage level; and a second control capacitor coupled between the second voltage regulator and the control terminal of the second switching element, wherein the power supply device supplies the initial voltage to the first node and receives the feedback current signal from the second node, and wherein the initial voltage is greater than or equal to the sum of the first critical voltage level and the common energy voltage level of the first switching element, or the sum of the second critical voltage level and the common energy voltage level of the second switching element.

5. The power supply control system of claim 4, wherein the first information feature is a first current level and the second information feature is a second current level different from the first current level.

6. The power supply control system of claim 1, wherein the load device includes a microcontroller and a current generator for implementing the first circuit module, the second circuit module, or both based on the initial voltage.

7. The power supply control system of claim 6, wherein the first information feature is a current level, and the second information feature is the number of at least one current pulses that occur after the current level returns to zero.

8. The power supply control system of claim 1, wherein the power supply device comprises: a current detection unit for detecting the first information feature and the second information feature; and a feedback control unit for determining the first power supply parameter and the second power supply parameter based on the first information feature, the second information feature and a lookup table, so as to control the DC-DC converter to supply power to the load device.

9. A load device comprising: an input node configured to receive an initial voltage; a feedback current signal generating module coupled to the input node and configured to generate a feedback current signal in response to the initial voltage, the feedback current signal having at least a first information feature and a second information feature; wherein the feedback current signal generating module comprises: a first circuit module generating the first information feature in response to the initial voltage; a second circuit module generating the second information feature in response to the initial voltage; and an output node configured to transmit the feedback current signal.

10. The load device as described in claim 9, wherein: The first circuit module includes: a load resistor, a first end of which is coupled to the input node; a switching element, a first end of which is coupled to a second end of the load resistor, and a second end of which is coupled to the output node; and a voltage regulator, coupled to the input node, for turning off in response to a voltage level at the input node being less than a critical voltage level, and for turning on in response to a voltage level at the input node being greater than or equal to the critical voltage level; and the second circuit module includes: a control resistor, a first end of which is coupled to the output node, and a second end of which is coupled to a control terminal of the switching element; and a control capacitor, coupled between the voltage regulator and the control terminal of the switching element, wherein the initial voltage is greater than or equal to the sum of the critical voltage level and the operating voltage level of the switching element.

11. The load device of claim 10, wherein the first information feature is a current level and the second information feature is a duration before the current level returns to zero.

12. The load device as described in claim 9, wherein: The first circuit module includes: a first load resistor, one first terminal of which is coupled to the input node; a first switching element, one first terminal of which is coupled to a second terminal of the first load resistor, the second terminal of which is coupled to a first terminal of a first control resistor at the output node, and a control terminal of which is coupled to a second terminal of the first control resistor; a first voltage regulator coupled to the input node, configured to turn off in response to a voltage level at the input node being less than a first threshold voltage level, and to turn on in response to a voltage level at the input node being greater than or equal to the first threshold voltage level; and a first control capacitor coupled between the first voltage regulator and the control terminal of the first switching element; and the second circuit module includes: a second load resistor, one first terminal of which is coupled to the input node; A second switching element, one first terminal of which is coupled to a second terminal of a second load resistor, the second terminal of which is coupled to a first terminal of a second control resistor at the output node, and a control terminal of which is coupled to a second terminal of the second control resistor; a second voltage regulator, coupled to the input node, for turning off in response to a voltage level at the input node being less than a second critical voltage level, and for turning on in response to a voltage level at the input node being greater than or equal to the second critical voltage level; and a second control capacitor, coupled between the second voltage regulator and the control terminal of the second switching element, wherein the initial voltage is greater than or equal to the sum of the first critical voltage level and the common energy voltage level of the first switching element, or the sum of the second critical voltage level and the common energy voltage level of the second switching element.

13. The load device of claim 12, wherein the first information feature is a first current level and the second information feature is a second current level different from the first current level.

14. The load device of claim 9, wherein the feedback current signal generation module includes a microcontroller and a current generator for implementing the first circuit module, the second circuit module, or both based on the initial voltage.

15. The load device of claim 14, wherein the first information feature is a current level and the second information feature is the number of at least one current pulses that occur after the current level returns to zero.

16. A power supply control method comprising: supplying an initial voltage to a load device, the load device including a feedback current signal generating module configured to generate a feedback current signal in response to the initial voltage, the feedback current signal having at least a first information feature and a second information feature; wherein the feedback current signal generating module includes: a first circuit module generating the first information feature in response to the initial voltage; and a second circuit module generating the second information feature in response to the initial voltage; receiving the feedback current signal from the load device and determining a first power supply parameter and a second power supply parameter, wherein the first power supply parameter is one of voltage, current, or power, and the second power supply parameter is the other of voltage, current, or power; supplying power to the load device based on the first power supply parameter and the second power supply parameter; and detecting a feedback current of the load device to determine whether to resupply the initial voltage and to determine the first power supply parameter and the second power supply parameter.

17. The power supply control method of claim 16, wherein determining the first power supply parameter and the second power supply parameter comprises: determining the first power supply parameter and the second power supply parameter based on the first information feature of the feedback current signal, the second information feature, and a lookup table.

18. The power supply control method of claim 16, wherein determining the first power supply parameter and the second power supply parameter comprises: detecting a current level of the feedback current signal to determine the first power supply parameter, and detecting a duration before the current level returns to zero to determine the second power supply parameter.

19. The power supply control method of claim 16, wherein determining the first power supply parameter and the second power supply parameter comprises: detecting a first current level of the feedback current signal to determine the first power supply parameter, and detecting a second current level different from the first current level to determine the second power supply parameter.

20. The power supply control method of claim 16, wherein determining the first power supply parameter and the second power supply parameter comprises: detecting a current level of the feedback current signal to determine the first power supply parameter, and detecting the number of at least one current pulse that occurs after the current level returns to zero to determine the second power supply parameter.

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