Device for reducing dissipated power of device

Abstract

The utility model aims to provide the device for reducing the dissipated power of the device, which can reduce the dissipated power of the device, reduce the heating of the device, prolong the service life of the device and improve the output range of the voltage source without changing the key device. The circuit comprises an operational amplifier, a first power converter and a first digital-to-analog converter, the non-inverting input end of the operational amplifier is connected to the output end of an external error amplifier, the VIN end of the first power converter is connected to an external input voltage, and the SDA end and the SCL end of the first digital-to-analog converter are connected to an external upper computer. The VOUT end of the first digital-to-analog converter is connected with the FBX end of the first power converter, the BIAS end of the first power converter is connected with the V + end of the operational amplifier, namely the positive power supply voltage PPVCC of the operational amplifier, and the output end of the operational amplifier serves as the output voltage AMPOUT of a voltage source. The utility model is applied to the technical field of automatic test equipment.

Description

Technical Field

[0001] The utility model is applied to the technical field of automatic testing equipment, and particularly relates to a device for reducing the power dissipation of a device. Background Art

[0002] A voltage source is a model abstracted from a real-world power source. It maintains a constant voltage across its terminals regardless of the current flowing through it. A voltage source has two fundamental properties: first, its terminal voltage, a constant value U or a time function U(t), is independent of the current flowing through it; second, the voltage of the voltage source itself is fixed, while the current flowing through it is arbitrary. Dissipated power, also known as power dissipation, refers to the difference between the total active input power and the total active output power of a grid element or the entire grid at a given moment. The application of voltage sources in automated testing primarily lies in providing precise voltage signals and improving the overall accuracy and granularity of test equipment in test and measurement systems, thereby enabling more precise control and excitation of external signal sources and nanoactuators. Voltage sources, particularly high-precision voltage sources, play a vital role in the electronics field. They are used to achieve precision measurement, calibration, and voltage signal stability requirements for various applications. Their accuracy, stability, and traceability make them an indispensable component in scientific research, engineering design, and manufacturing. High-precision voltage sources can improve measurement accuracy, reduce errors, and ensure the performance and reliability of electronic equipment and systems. However, existing technologies suffer from the drawbacks of high power dissipation, severe device heat generation, and reduced device lifespan.

[0003] A diode is an electronic device made of semiconductor materials (such as silicon, selenium, and germanium). It has two electrodes: a positive electrode, also called an anode, and a negative electrode, also called a cathode. When a forward voltage is applied between the two electrodes, the diode conducts, and when a reverse voltage is applied, the diode cuts off. The conduction and cutoff states of a diode are analogous to the on and off states of a switch. Diodes are one of the most commonly used semiconductor devices, exhibiting asymmetric forward and reverse current characteristics. They are widely used in electronic devices and circuits. To ensure proper circuit operation, accurate performance testing and evaluation of diodes is essential. Diodes are classified into various types depending on their application. Commonly used diodes include light-emitting diodes, rectifier diodes, and Zener diodes. The voltage and current parameters of different diode types vary significantly. For example, the forward voltage of light-emitting diodes is generally less than 2V, while conventional Zener diodes maintain a voltage between 5 and 25V. Therefore, test equipment must be able to provide different voltage sources to accommodate various tests. However, the supply voltage range of currently used devices is limited to 20V. This makes it impossible to meet testing requirements if a -15 to +15V voltage output is required. Therefore, it is necessary to provide a device for reducing device power dissipation, reducing device heat generation, increasing device life, and increasing the output range of the voltage source without changing key components. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a device for reducing device power dissipation, which can reduce device heat dissipation, increase device life, and increase the output range of the voltage source without changing key components.

[0005] The technical solution adopted by the present invention is as follows: the present invention includes an operational amplifier, a first power converter and a first digital-to-analog converter, the non-inverting input terminal of the operational amplifier is connected to the output terminal of an external error amplifier, the VIN terminal of the first power converter is connected to an external input voltage, the SDA terminal and the SCL terminal of the first digital-to-analog converter are connected to an external host computer, the VOUT terminal of the first digital-to-analog converter is connected to the FBX terminal of the first power converter, the BIAS terminal of the first power converter is connected to the V+ terminal of the operational amplifier, that is, the positive power supply voltage PP_VCC of the operational amplifier, and the output terminal of the operational amplifier serves as the output voltage AMP_OUT of the voltage source.

[0006] As can be seen from the above solution, the external host computer controls the output size of the first digital-to-analog converter, and then controls the output size of the first power converter, thereby changing the output value of PP-VCC. Since Iload is the load current, under the same heat dissipation environment conditions, the greater the dissipation power, the greater the device heat, the higher the body temperature, and the shorter the service life of the device. Therefore, reducing the value of the device forward power supply PP_VCC can reduce the device dissipation power, reduce the device heat, and increase the device life.

[0007] A preferred solution is that the device for reducing device power dissipation further includes a first resistor, and the non-inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier via the first resistor.

[0008] A preferred solution is that the device for reducing device power dissipation also includes a second power converter and a second digital-to-analog converter, the VIN terminal of the second power converter is connected to an external input voltage, the SDA terminal and SCL terminal of the second digital-to-analog converter are connected to an external host computer, the VOUT terminal of the second digital-to-analog converter is connected to the FBX terminal of the second power converter, and the BIAS terminal of the second power converter is connected to the V- terminal of the operational amplifier, that is, the negative power supply voltage PN_VCC of the operational amplifier.

[0009] A preferred solution is that the device for reducing the power dissipation of the device also includes several groups of adjustment output modules arranged in parallel, the output end of the operational amplifier is connected to the high-end HIGH-FORCE of the power output through the adjustment output module, and the adjustment output module includes a relay and a capacitor and a second resistor arranged in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a simplified block diagram of the voltage source output;

[0011] Figure 2 is a circuit schematic diagram of the operational amplifier;

[0012] Figure 3 is a circuit schematic diagram of the first power converter and the first digital-to-analog converter;

[0013] Figure 4 is a circuit schematic diagram of the second power converter and the second digital-to-analog converter. DETAILED DESCRIPTION

[0014] like Figures 1 to 4As shown, in this embodiment, the utility model includes an operational amplifier U801A, a first power converter U701 and a first digital-to-analog converter U703, the non-inverting input terminal of the operational amplifier U801A is connected to the output terminal of the external error amplifier, the VIN terminal of the first power converter U701 is connected to the external input voltage, the SDA terminal and the SCL terminal of the first digital-to-analog converter U703 are connected to the external host computer, the VOUT terminal of the first digital-to-analog converter U703 is connected to the FBX terminal of the first power converter U701, the BIAS terminal of the first power converter U701 is connected to the V+ terminal of the operational amplifier U801A, which is the positive power supply voltage PP_VCC of the operational amplifier U801A, and the output terminal of the operational amplifier U801A serves as the output voltage AMP_OUT of the voltage source.

[0015] The model of the operational amplifier U801A is AD8066ARZ, the model of the first power converter U701 is LT8364EDE#PBF, and the model of the first digital-to-analog converter U703 is MCP4725A0T-E / CH. Figure 1 This is a simplified block diagram of the precision voltage source output. Its principle is to output the voltage AMP_OUT through the operational amplifier U801A. The dissipation function calculation formula of the operational amplifier U801A as a voltage source output is:

[0016] Pd=(PP_VCC-AMP_OUT)*Iload

[0017] Where Pd is the power dissipated by the op amp, PP_VCC is the forward supply voltage of the op amp, AMP_OUT is the output voltage of the voltage source, and Iload is the load current. Under the same thermal environment, greater power dissipation results in greater device heat generation, higher body temperature, and shorter device lifespan. The formula shows that setting PP_VCC to an adjustable voltage can reduce the value of Pd. For example, if a test system originally has a fixed PP_VCC of 20V and is used to test a 2V, 40mA LED, Pd = (20-2) * 0.04 = 0.72W. By reducing the forward supply PP_VCC to 3V, Pd = (3-2) * 0.04 = 0.04W. This represents an 18-fold increase in Pd, and the device temperature rise is 18 times higher, significantly reducing power dissipation. In addition, since AMP_OUT in the test system is determined according to the requirements of the DUT and cannot be changed, and Iload in the test system is determined according to the electrical parameters of the DUT and cannot be changed, it is impossible to increase the output voltage AMP_OUT and reduce the load current Iload.

[0018] like Figures 1 to 4 As shown, in this embodiment, the device for reducing device power dissipation further includes a first resistor R801. The non-inverting input terminal of the operational amplifier U801A is connected to the output terminal of the operational amplifier U801A via the first resistor R801. The first resistor R801 serves to increase damping in the circuit and slow down the operational amplifier effect.

[0019] like Figures 1 to 4 As shown, in this embodiment, the device for reducing the power dissipation of the device also includes a second power converter U702 and a second digital-to-analog converter U704, the VIN terminal of the second power converter U702 is connected to the external input voltage, the SDA terminal and the SCL terminal of the second digital-to-analog converter U704 are connected to the external host computer, the VOUT terminal of the second digital-to-analog converter U704 is connected to the FBX terminal of the second power converter U702, and the BIAS terminal of the second power converter U702 is connected to the V- terminal of the operational amplifier U801A, which is the negative power supply voltage PN_VCC of the operational amplifier U801A.

[0020] The model of the second power converter U702 is LT8364EDE#PBF, and the model of the second digital-to-analog converter U704 is MCP4725A0T-E / CH. Figure 1 The simplified block diagram of a precision voltage source output shows the output voltage AMP_OUT via the op amp. Since the voltage output range depends on the op amp's power rails, the output voltage can only be within the positive and negative supply range. PP_VCC is the positive supply voltage for the output op amp, and PN_VCC is the negative supply voltage. Limited by the op amp's maximum supply voltage, the supply range must meet the condition (PP_VCC - PN_VCC < 20V). Therefore, the output range of this voltage source is fixed within 20V. To increase the output range, the op amp's supply voltages PP_VCC and PN_VCC can be adjusted via an external host program to ensure they do not exceed the op amp's safe supply range. For example, setting PP_VCC = 20V and PN_VCC = 0V allows the voltage source to output a range of 0 to 20V. Adjusting PP_VCC = 0V and PN_VCC = -20V allows the voltage source to output a range of -20 to 0V. Finally, the voltage source output can achieve a range of -20V~20V=40V. The voltage source output range has doubled on the original basis, thereby increasing the voltage source output range and being compatible with more test requirements.

[0021] like Figure 2As shown, in this embodiment, the device for reducing device power dissipation also includes several groups of parallel-connected adjustment output modules. The output end of the operational amplifier U801A is connected to the high-end HIGH-FORCE of the power output via the adjustment output module. The adjustment output module includes a relay and a capacitor and a second resistor connected in parallel. The adjustment output module is used to adjust the output current gear. The relay model is SIP-1A05. Several of the relays include K805, K806, K807, K808, K809, K810, K811, and K812. Several of the capacitors include C805, C806, C807, C808, C809, C810, C811, and C812. Several of the second resistors include R802, R803, R805, R806, R807, R808, R809, and R810.

Claims

1. A device for reducing device power dissipation, characterized in that: It includes an operational amplifier (U801A), a first power converter (U701) and a first digital-to-analog converter (U703), wherein the non-inverting input terminal of the operational amplifier (U801A) is connected to the output terminal of an external error amplifier, the VIN terminal of the first power converter (U701) is connected to an external input voltage, the SDA terminal and the SCL terminal of the first digital-to-analog converter (U703) are connected to an external host computer, the VOUT terminal of the first digital-to-analog converter (U703) is connected to the FBX terminal of the first power converter (U701), the BIAS terminal of the first power converter (U701) is connected to the V+ terminal of the operational amplifier (U801A), which is the positive power supply voltage PP_VCC of the operational amplifier (U801A), and the output terminal of the operational amplifier (U801A) serves as the output voltage AMP_OUT of the voltage source.

2. The device for reducing device power dissipation according to claim 1, characterized in that: The device for reducing device power dissipation also includes a first resistor (R801), and the non-inverting input end of the operational amplifier (U801A) is connected to the output end of the operational amplifier (U801A) via the first resistor (R801).

3. The device for reducing device power dissipation according to claim 1, wherein: The device for reducing device power dissipation also includes a second power converter (U702) and a second digital-to-analog converter (U704), wherein the VIN terminal of the second power converter (U702) is connected to an external input voltage, the SDA terminal and the SCL terminal of the second digital-to-analog converter (U704) are connected to an external host computer, the VOUT terminal of the second digital-to-analog converter (U704) is connected to the FBX terminal of the second power converter (U702), and the BIAS terminal of the second power converter (U702) is connected to the V-terminal of the operational amplifier (U801A), which is the negative power supply voltage PN_VCC of the operational amplifier (U801A).

4. The device for reducing device power dissipation according to claim 1, wherein: The device for reducing device power dissipation also includes several groups of adjustment output modules arranged in parallel. The output end of the operational amplifier (U801A) is connected to the high-end HIGH-FORCE of the power output through the adjustment output module. The adjustment output module includes a relay and a capacitor and a second resistor arranged in parallel.

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