Equipment power consumption acquiring device with various interfaces

[0025] Example 1

[0026] Such as figure 1 with image 3 As shown, this embodiment includes: a device for collecting power consumption of equipment with multiple interfaces, including: a number of interfaces arranged on a circuit board that are connected to a sampling and amplifying circuit through a sampling signal line, and connected to the output end of the sampling and amplifying circuit Oscilloscope and a microcontroller connected to the interface through a data control line, wherein: a relay is set between the interface and the sampling amplifier circuit, and the analog signal information from the interface is output to the sampling amplifier circuit, a GPIO port of the microcontroller Connected to the gate of the isolated MOS tube, the GPIO port of the microcontroller controls the on and off of the isolated MOS tube, the drain of the isolated MOS tube is connected to the first ground, and the source is connected to the second ground.

[0027] The interface is used to collect the power consumption information of the device under test in real time, including but not limited to: smart card interface (7816 interface), SPI (serial peripheral) interface, USB (universal serial bus) interface, SCI ( Serial communication) interface and/or SDIO (safe digital input output) interface.

[0028] The equipment to be tested includes, but is not limited to: power consumption collection and analysis equipment in the field of security technology.

[0029] An external power supply is provided in the equipment power consumption collection device, and the outer casing of the external power supply is connected to the second ground wire.

[0030] The casing of the sampling amplifier circuit is connected to the first ground wire.

[0031] The shell of the microcontroller is connected to the second ground wire.

[0032] The ground terminal of the interface is connected to the first ground wire through a sampling resistor, and the microcontroller is connected to the relay through the data wire and the control wire to select the sampling and amplifying circuits of different interfaces.

[0033] The relay described is a high-frequency relay, such as a bandwidth below 1GHz and a contact voltage of below 100mΩ, such as G6K-2F0RF.

[0034] The sampling resistor is a precision resistor. When the interface is a USB interface, the sampling resistance is 0.2-0.8Ω, and when the interface is a 7816 interface, the sampling resistance is 5Ω.

[0035] The interface and the sampling amplifier circuit can also be replaced with a variable resistor without using a relay, and the analog signal information from the interface is output to the sampling amplifier circuit, and the ground terminal of the variable resistor is connected to the first ground wire. The advantage of this is that compared with the use of relays, the attenuation of the original signal in each frequency band is less, but such small value variable resistors on the market are difficult to buy and are not easy to be automatically controlled. For this application, manual changes are required. The resistance value is inconvenient to use.

[0036] Since the power consumption of devices with different interfaces will be very different, and the gain and offset range of the amplifier circuit of the power collector sampling module has been fixed, so if the same sampling resistor is used for devices with different interfaces, it may be The output signal of devices with high power consumption is distorted (no matter how the gain and bias are adjusted, it will be distorted). For example, the sampling resistance of 7816 (smart card) interface devices is about 5Ω, and the amplifying circuit of the power collector can be under 5Ω sampling resistance. Ensure that the output power consumption signal of the 7816 interface device is not distorted. At this time, if the device is replaced with a USB interface device (such as USBKEY (Universal Serial Bus Password Disk)), its power consumption is much greater than the 7816 interface device, and sampling If the resistance is constant, it may cause distortion of the power consumption signal output by the power collector (that is, the minimum sampling gain adjustment, the minimum offset adjustment may also be distorted), so the sampling resistance of the USBKEY must be reduced to ensure the amplifier circuit The output signal is not distorted. If the device with 7816 interface and USB interface, or even more interfaces (SPI, SCI, SDIO, etc.) is integrated on the power collector, different sampling resistors must be configured for each interface device, and different sampling resistors are required Equipped with corresponding selection circuits such as relays or variable resistors. At the same time, since this method mainly collects real-time power consumption change information of the device under test, it needs to truly and accurately reflect the power consumption change of the device under test while it is working, and other signals cannot be introduced, so the grounding of the circuit is very demanding.

[0037] Such as image 3 As shown, the foregoing embodiment specifically includes the following steps:

[0038] 1) Use the microcontroller hardware pins to connect different interfaces. This example mainly implements the smart card interface (7816) interface and the USB (USBKEY) interface to realize the communication between the microcontroller and the device under test. At the same time the microcontroller can communicate with the computer.

[0039] 2) The sampling resistor of the smart card (7816) interface uses a precision resistor with a resistance of 5Ω, and the sampling resistor of the USB (USBKEY) interface uses a precision resistor with a resistance of 0.3Ω.

[0040] 3) The microcontroller controls the high-frequency relay (such as G6K-2F0RF), and selects different sampling resistors for different interface devices.

[0041] 4) The ground wire of the entire device is divided into two ground wires, the first ground wire is the ground wire of the external power supply, the second ground wire is the ground wire of the amplifying circuit, and the two ground wires are not directly connected.

[0042] 5) The two grounds are connected through the drain and source of the MOS tube. The microcontroller controls the gate of the MOS tube. When the power consumption information of the smart card (7816) interface device is collected, the drain and source of the MOS tube are turned off. , To isolate the two ground wires; when collecting the power consumption information of the USB (usbkey) interface device, the drain and source of the MOS tube are turned on to connect the two grounds.

[0043] 6) The system shares a set of signal amplification circuit.