Patent ID: 7783464

Claim:
A card for simulating different peripheral component interconnect (PCI) loads, comprising: an interface configured for electrically connecting to a motherboard; and a load circuit for simulating the different loads, wherein the load circuit comprises at least one power module receiving a voltage from the interface, wherein the power module selectively changes resistance thereof to thermally consume powers of the corresponding voltage thereby simulating the different loads; wherein the power module comprises at least two load units, the load units are connected between the interface and a ground in parallel, each of the load units comprising a switch circuit configured for selectively controlling the corresponding load unit to receive the voltage from the interface, so that the controlled load unit thermally consumes power of the voltage to simulate the different loads; wherein the switch circuit comprises a limiting resistor, a switch, a transistor acting as an electrical switch, wherein a base of the transistor receives the voltage through the limiting resistor, a collector of the transistor receives the voltage, an emitter of the transistor is grounded, and wherein the switch is connected between the base and the emitter of the transistor.