Direct current electronic load circuit and device
By designing a DC electronic load circuit, including a MOS switch module, a load switch module, a temperature protection module, and an overcurrent protection module, the problems of insufficient adjustment of load output and safety protection in the existing technology are solved, and the effects of high-precision adjustment and safety protection are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-27
AI Technical Summary
Existing DC electronic load modules are insufficient in regulating load output and providing safety protection, making it difficult to meet the high requirements of complex power electronic and consumer electronic systems.
A DC electronic load circuit was designed, including a MOS switch module, a load switch module, a temperature protection module, and an overcurrent protection module. The MOS switch module is controlled by the DAC signal terminal of the IO interface, and the voltage and current are detected by the operational amplifier output module to achieve safety protection and flexible adjustment.
It achieves high-precision regulation of load current, voltage and power, provides safety protection functions, meets the application needs of different scenarios, and improves the safety and convenience of the circuit.
Smart Images
Figure CN224052279U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of aging test, especially relates to a direct current electronic load circuit and equipment. BACKGROUND
[0002] The direct current electronic load module is a kind of key equipment for simulating, testing and verifying direct current power rail system, and is widely used in power electronics, consumer electronics and other fields.The main function of direct current electronic load module is to simulate actual load condition, test the performance of power rail under different loads, and ensure the stability and reliability of power rail system.With the rapid development of power electronics technology, the application scene of consumer electronic system is increasingly complex, and the requirement of load simulation is also higher and higher. SUMMARY
[0003] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a direct current electronic load circuit and equipment, which can adjust pull load output and provide safety protection.
[0004] In one aspect, the utility model embodiment provides a direct current electronic load circuit, comprising:
[0005] MOS switch module is connected to power supply circuit, and the control end of the MOS switch module is connected to the DAC signal end of IO interface through first operational amplifier unit;
[0006] Load switch module is connected to the power supply circuit, and the control end of the load switch module is connected to the load signal end of the IO interface;
[0007] Temperature protection module is connected to the control end of the MOS switch module;
[0008] Overcurrent protection module, input end is connected to the power supply circuit, and the output end of the overcurrent protection module is connected to the control end of the MOS switch module;
[0009] Operational amplifier output module, input end is connected to the power supply circuit, and the output end of the operational amplifier output module is connected to the ADC signal end of the IO interface.
[0010] According to some embodiments of the utility model, the MOS switch module includes a first MOS tube connected to the power supply circuit, and the gate of the first MOS tube is connected to the first operational amplifier unit.
[0011] According to some embodiments of the utility model, the load switch module includes second MOS pipe and first control unit, second MOS pipe is connected in supply circuit, the output of first control unit is connected to the grid of second MOS pipe and first power supply end respectively, the control end of first control unit is connected to the load signal end of IO interface.
[0012] According to some embodiments of the utility model, the first control unit includes third MOS pipe and fourth MOS pipe, the drain of third MOS pipe is connected to second power supply end and the grid of fourth MOS pipe, the grid of third MOS pipe is used as the control end of first control unit, the drain of fourth MOS pipe is used as the output of first control unit.
[0013] According to some embodiments of the utility model, the temperature protection module includes temperature sensor and second control unit, the output of temperature sensor is connected to second control unit, the output of second control unit is connected to MOS switch module.
[0014] According to some embodiments of the utility model, the second control unit includes fifth MOS pipe and sixth MOS pipe, the grid of fifth MOS pipe is used as the input of second control unit, the drain of fifth MOS pipe is connected to second power supply end and the grid of sixth MOS pipe, the drain of sixth MOS pipe is used as the output of second control unit.
[0015] According to some embodiments of the utility model, sampling module is further connected between overcurrent protection module and supply circuit, the output of sampling module is further connected to the inverting input of first operational amplifier unit.
[0016] According to some embodiments of the utility model, the output of sampling module is further connected with second operational amplifier unit, the output of second operational amplifier unit is connected to the sampling signal end of IO interface.
[0017] According to some embodiments of the utility model, overcurrent protection module includes comparator unit and D flip-flop unit, the output of comparator unit is connected to D flip-flop unit, the output of D flip-flop unit is used as the output of overcurrent protection module.
[0018] In another aspect, the utility model embodiment provides a kind of direct current electronic load equipment, including above-mentioned direct current electronic load circuit.
[0019] The utility model embodiment has at least the following beneficial effects:
[0020] The DAC signal terminal of the IO interface can control the MOS switching module through the first operational amplifier unit, thereby adjusting the load current, voltage and power. The power supply circuit is equipped with a load switch module, a temperature protection module and an overcurrent protection module, which can provide safety protection functions. The operational amplifier output module can perform voltage detection and load current detection of the power supply circuit to meet the application requirements of different scenarios.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0023] Figure 1 This is a schematic block diagram of the DC electronic load circuit according to an embodiment of the present invention;
[0024] Figure 2 for Figure 1 The schematic diagram of a partial circuit of a DC electronic load circuit is shown.
[0025] Figure 3 for Figure 1 The circuit schematic of the operational amplifier output module of the DC electronic load circuit is shown.
[0026] Figure 4 for Figure 1 The circuit schematic of the first control unit of the DC electronic load circuit is shown.
[0027] Figure 5 for Figure 1 The circuit diagram of the temperature sensor in the DC electronic load circuit is shown.
[0028] Figure 6 for Figure 1 The circuit diagram of the second control unit of the DC electronic load circuit is shown.
[0029] Figure 7 for Figure 1 The circuit schematic of the second operational amplifier unit of the DC electronic load circuit is shown.
[0030] Figure 8 for Figure 1 The circuit diagram of the comparator unit of the DC electronic load circuit is shown.
[0031] Figure 9 for Figure 1 The circuit diagram shown is of the D flip-flop unit in the DC electronic load circuit.
[0032] Reference signs:
[0033] MOS switch module 100, power supply circuit 101, first operational amplifier unit 110, DAC signal end 120, load switch module 200, load signal end 210, first control unit 220, temperature protection module 300, temperature sensor 310, I2C signal end 311, second control unit 320, overcurrent protection module 400, comparator unit 410, D flip-flop unit 420, operational amplifier output module 500, ADC signal end 510, sampling module 600, signal amplification unit 610, second operational amplifier unit 620. DETAILED DESCRIPTION
[0034] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as limiting the present application.
[0035] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, greater than, less than, more than, etc. are understood as not including the number, "above", "below", "within", etc. are understood as including the number. If there is a description of "first", "second", etc. is only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.
[0036] In the description of the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.
[0037] The present embodiment discloses a kind of direct current electronic load equipment, including direct current electronic load circuit. Please refer to Figure 1The direct current electronic load circuit comprises a MOS switch module 100, a load switch module 200, a temperature protection module 300, an overcurrent protection module 400 and an operational amplifier output module 500. The MOS switch module 100 is connected to a power supply circuit 101, and the control end of the MOS switch module 100 is connected to a DAC signal end 120 of an IO interface through a first operational amplifier unit 110. The load switch module 200 is connected to the power supply circuit 101, and the control end of the load switch module 200 is connected to a load signal end 210 of the IO interface. The temperature protection module 300 is connected to the control end of the MOS switch module 100. The input end of the overcurrent protection module 400 is connected to the power supply circuit 101, and the output end of the overcurrent protection module 400 is connected to the control end of the MOS switch module 100. The input end of the operational amplifier output module 500 is connected to the power supply circuit 101, and the output end of the operational amplifier output module 500 is connected to an ADC signal end 510 of the IO interface. The DAC is a digital-to-analog converter, and the ADC is an analog-to-digital converter.
[0038] The IO interface integrates multiple signal ends, such as the DAC signal end 120, the load signal end 210 and the ADC signal end 510, so as to reduce the number of interfaces and the wiring complexity and facilitate user use. In use, the upper control module is connected to the DAC signal end 120 of the IO interface through the DAC module, so that the upper control module sends a control signal to the MOS switch module 100 through the DAC module, thereby adjusting the conduction state of the MOS switch module 100 and further adjusting the load current, voltage and power. Since the adjustment range of the MOS switch module 100 is wide, the MOS switch module 100 is easy to heat and even damage the circuit when the load current is large. Therefore, the temperature protection module 300 and the overcurrent protection module 400 can play a protection role and improve the safety of use. The load switch module 200 is also integrated in the circuit, which can switch control the load and improve the convenience of use. The operational amplifier output module 500 can detect the voltage of the power supply circuit 101 and the load current, thereby reading the voltage value and the load current of the load, and meeting the application requirements of different scenes.
[0039] Please refer to Figure 2 The MOS switch module 100 comprises a first MOS tube connected to the power supply circuit 101, such as Figure 2The gate of the first MOS tube is connected with the first operational amplifier unit 110, as shown by the mark Q803. The drain of the first MOS tube is connected with the positive voltage node ELOAD_IN_P, and the source of the first MOS tube is connected with the reference voltage node DGND. The first MOS tube is a power electronic device, has a fast switching speed, and serves as a control switch of the load circuit, can quickly respond to load conversion, and the DAC signal end 120 of the IO interface is connected with the upper control module. Through high-precision digital control, high-precision voltage and current output can be realized, and by controlling the working state of the first MOS tube, different load conditions can be simulated, and a wide range of load simulation can be realized. Please refer to Figure 2 and Figure 3 , Figure 3 The circuit principle diagram of the operational amplifier output module 500 is shown, and the two input ends of the operational amplifier output module 500 are connected at both ends of the power supply circuit 101, as shown by the nodes Vsense_P and Vsense_N.
[0040] Please refer to Figure 2 and Figure 4 The load switch module 200 includes a second MOS tube (as shown by the mark Q801 in Figure 2 ) and a first control unit 220. The second MOS tube is connected with the power supply circuit 101, the output end of the first control unit 220 is respectively connected with the gate of the second MOS tube and the first power supply end (as shown by the mark PP19V5 in Figure 4 ), and the control end of the first control unit 220 is connected with the load signal end 210 of the IO interface. The load signal end 210 of the IO interface is connected with the upper control module. According to the control signal issued by the upper control module, the first control unit 220 can perform switching control on the second MOS tube. The second MOS tube is connected with the power supply circuit 101, and when the second MOS tube is cut off, the power supply circuit 101 can be cut off, and when the second MOS tube is turned on, the power supply circuit 101 can be turned on.
[0041] Please refer to Figure 4 The first control unit 220 includes a third MOS tube (as shown by the mark Q804 in Figure 4 ) and a fourth MOS tube (as shown by the mark Q802 in Figure 4 ), the drain of the third MOS tube is connected with the second power supply end (as shown by the mark PP5V in Figure 4The gate of the third MOS tube is used as the control end of the first control unit 220, and the drain of the fourth MOS tube is used as the output end of the first control unit 220. The voltage value of the first power supply end is higher than that of the second power supply end. The control signal of the upper control module is transmitted to the gate of the third MOS tube to control the conduction of the third MOS tube, and then the fourth MOS tube is controlled to be turned on. In this way, the conduction state of the second MOS tube can be controlled, so as to control the conduction of the power supply loop 101.
[0042] Please refer to Figure 5 and Figure 6 The temperature protection module 300 includes a temperature sensor 310 and a second control unit 320. The output end of the temperature sensor 310 is connected to the second control unit 320, and the output end of the second control unit 320 is connected to the MOS switch module 100. The temperature sensor 310 is used to detect the temperature of the circuit. When the output signal of the temperature sensor 310 is higher than a preset threshold, the second control unit 320 controls the MOS switch module 100 to be cut off, so as to disconnect the power supply loop 101 and realize over-temperature protection. The output end of the temperature sensor 310 is also connected to the I2C signal end 311 of the IO interface, so as to send the temperature detection signal to the upper control module.
[0043] Please refer to Figure 6 The second control unit 320 includes a fifth MOS tube (as shown by a mark Q807 in Figure 6 ) and a sixth MOS tube (as shown by a mark Q806 in Figure 6 ). The gate of the fifth MOS tube is used as the input end of the second control unit 320, the drain of the fifth MOS tube is connected to the second power supply end and the gate of the sixth MOS tube, and the drain of the sixth MOS tube is used as the output end of the second control unit 320. The output signal of the temperature sensor 310 is transmitted to the gate of the fifth MOS tube to control the conduction or cut-off of the fifth MOS tube, so as to control the conduction or cut-off of the sixth MOS tube.
[0044] Please refer to Figure 2 The sampling module 600 is also connected between the over-current protection module 400 and the power supply loop 101, and the output end of the sampling module 600 is also connected to the inverting input end of the first operational amplifier unit 110. The sampling module 600 includes a sampling resistor (as shown by a mark R826 in Figure 2 ) and a signal amplification unit 610. The sampling resistor is connected to the power supply loop 101, and the input end of the signal amplification unit 610 is connected to the sampling resistor to receive the sampling signal of the sampling resistor and amplify and output the sampling signal.
[0045] Please refer to Figure 7The output end of the sampling module 600 is further connected with a second operational amplifier unit 620, and the output end of the second operational amplifier unit 620 is connected to a sampling signal end (as shown in Figure 7 CURR_OUT) of the IO interface. The second operational amplifier unit 620 amplifies and outputs the output signal of the sampling module 600 to the sampling signal end of the IO interface, and transmits the signal to the upper control module through the sampling signal end, so as to realize signal monitoring and feedback control.
[0046] Please refer to Figure 8 and Figure 9 The over-current protection module 400 comprises a comparator unit 410 and a D flip-flop unit 420, the output end of the comparator unit 410 is connected to the D flip-flop unit 420, and the output end of the D flip-flop unit 420 is used as the output end of the over-current protection module 400. The output end of the sampling module 600 is connected to the input end of the comparator unit 410, the comparator unit 410 compares the sampling signal with a preset signal and then outputs the signal to the D flip-flop unit 420, so as to control the conduction or cut-off of the MOS switch module 100, and then control the conduction or cut-off of the power supply circuit 101, thereby realizing over-current protection. The D flip-flop unit 420 is further connected to a reset signal end of the IO interface, so as to receive a reset control signal (as shown in Figure 9 RST_OCP) of the upper control module.
[0047] The embodiment can realize wide-range adjustment by digitally controlling the MOS switch module 100, and the temperature protection and over-current protection are added to improve the safety of the circuit. The IO interface is integrated with multiple signal ends, so the circuit is simple and convenient to use, has high integration, small size and low power consumption.
[0048] The above embodiment of the utility model is described in detail in combination with the drawings, but the utility model is not limited to the above embodiment. Within the knowledge range possessed by those skilled in the art, various changes can be made without departing from the purpose of the utility model.
Claims
1. A DC electronic load circuit, characterized in that, include: A MOS switch module (100) is connected to a power supply circuit (101). The control terminal of the MOS switch module (100) is connected to the DAC signal terminal (120) of the IO interface through a first operational amplifier unit (110). A load switch module (200) is connected to the power supply circuit (101), and the control terminal of the load switch module (200) is connected to the load signal terminal (210) of the IO interface. A temperature protection module (300) is connected to the control terminal of the MOS switch module (100); An overcurrent protection module (400) has its input terminal connected to the power supply circuit (101) and its output terminal connected to the control terminal of the MOS switch module (100). The op-amp output module (500) has its input terminal connected to the power supply circuit (101), and its output terminal connected to the ADC signal terminal (510) of the IO interface.
2. The DC electronic load circuit according to claim 1, characterized in that, The MOS switch module (100) includes a first MOS transistor connected to the power supply circuit (101), and the gate of the first MOS transistor is connected to the first operational amplifier unit (110).
3. The DC electronic load circuit according to claim 1 or 2, characterized in that, The load switch module (200) includes a second MOS transistor and a first control unit (220). The second MOS transistor is connected to the power supply circuit (101). The output terminal of the first control unit (220) is connected to the gate of the second MOS transistor and the first power supply terminal, respectively. The control terminal of the first control unit (220) is connected to the load signal terminal (210) of the IO interface.
4. The DC electronic load circuit according to claim 3, characterized in that, The first control unit (220) includes a third MOS transistor and a fourth MOS transistor. The drain of the third MOS transistor is connected to the second power supply terminal and the gate of the fourth MOS transistor. The gate of the third MOS transistor is used as the control terminal of the first control unit (220), and the drain of the fourth MOS transistor is used as the output terminal of the first control unit (220).
5. The DC electronic load circuit according to claim 1, characterized in that, The temperature protection module (300) includes a temperature sensor (310) and a second control unit (320). The output terminal of the temperature sensor (310) is connected to the second control unit (320), and the output terminal of the second control unit (320) is connected to the MOS switch module (100).
6. The DC electronic load circuit according to claim 5, characterized in that, The second control unit (320) includes a fifth MOS transistor and a sixth MOS transistor. The gate of the fifth MOS transistor is used as the input terminal of the second control unit (320). The drain of the fifth MOS transistor is connected to the second power supply terminal and the gate of the sixth MOS transistor. The drain of the sixth MOS transistor is used as the output terminal of the second control unit (320).
7. The DC electronic load circuit according to claim 1, characterized in that, A sampling module (600) is also connected between the overcurrent protection module (400) and the power supply circuit (101), and the output terminal of the sampling module (600) is also connected to the inverting input terminal of the first operational amplifier unit (110).
8. The DC electronic load circuit according to claim 7, characterized in that, The output of the sampling module (600) is also connected to a second operational amplifier unit (620), and the output of the second operational amplifier unit (620) is connected to the sampling signal terminal of the IO interface.
9. The DC electronic load circuit according to claim 1, 7, or 8, characterized in that, The overcurrent protection module (400) includes a comparator unit (410) and a D flip-flop unit (420). The output terminal of the comparator unit (410) is connected to the D flip-flop unit (420), and the output terminal of the D flip-flop unit (420) is used as the output terminal of the overcurrent protection module (400).
10. A DC electronic load device, characterized in that, Includes the DC electronic load circuit as described in any one of claims 1 to 9.