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CN-224233552-U - Decompression circuit and high-voltage direct-current decompression system

CN224233552UCN 224233552 UCN224233552 UCN 224233552UCN-224233552-U

Abstract

The utility model discloses a decompression circuit and a high-voltage direct current decompression system, which relate to the technical field of electronic information, the proposal is that a plurality of first resistors larger than a first preset resistance threshold and a second resistor smaller than a second preset resistance threshold are connected in series between the anode and the cathode of a high-voltage direct current power supply, namely a plurality of high-resistance resistors are connected in series with a low-resistance resistor, and then the voltage at two ends of the second resistor can be tested by a common universal meter or oscilloscope in a voltage division mode, the output voltage of the high-voltage direct-current power supply is determined by the voltage at two ends of the second resistor and the resistance ratio of each first resistor to the second resistor, and whether the voltage output by the high-voltage direct-current power supply is stable or not can be judged by the voltage values at two ends of the second resistor acquired in real time.

Inventors

  • ZHOU RONGCHAO

Assignees

  • 上海品臻影像科技有限公司

Dates

Publication Date
20260512
Application Date
20250416

Claims (10)

  1. 1. The decompression circuit is characterized by comprising a plurality of first resistors and a second resistor, wherein the resistance value of the first resistors is larger than a first preset resistance value threshold, the resistance value of the second resistors is smaller than a second preset resistance value threshold, and the first preset resistance value threshold is larger than the second preset resistance value threshold; The first resistors are connected in series, a first public end is connected with the positive electrode of the high-voltage direct-current power supply, and a second public end is respectively connected with the first end of the second resistor and the voltage acquisition positive end of the universal meter or the oscilloscope; and the second end of the second resistor is respectively connected with the negative electrode of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope.
  2. 2. The decompression circuit according to claim 1, further comprising: And the switching devices are connected with the first resistors in one-to-one correspondence in parallel, and the control end is connected with the controller and used for carrying out corresponding on-off based on the control of the controller.
  3. 3. The decompression circuit according to claim 1, further comprising: The voltage acquisition device comprises an autotransformer, wherein a first end of a primary winding of the autotransformer is connected with an anode of a high-voltage direct-current power supply, a second end of the primary winding of the autotransformer is connected with a cathode of the high-voltage direct-current power supply, a first end of a secondary winding of the autotransformer is connected with a universal meter or a voltage acquisition positive end of an oscilloscope, a second end of the secondary winding of the autotransformer is connected with a voltage acquisition negative end of the universal meter or the oscilloscope, and a secondary winding control end of the autotransformer is connected with a controller for changing the number of turns of the secondary winding of the autotransformer based on the control of the controller.
  4. 4. The decompression circuit according to claim 1, further comprising: The positive input end of the buck DCDC converter is connected with the positive electrode of the high-voltage direct-current power supply, the negative input end of the buck DCDC converter is connected with the negative electrode of the high-voltage direct-current power supply, the positive output end of the buck DCDC converter is connected with the universal meter or the voltage acquisition positive end of the oscilloscope, the negative output end of the buck DCDC converter is connected with the voltage acquisition negative end of the universal meter or the oscilloscope, and the control end of the buck DCDC converter is connected with the controller and used for changing the duty ratio of a switching tube inside the buck DCDC converter based on the control of the controller.
  5. 5. The decompression circuit according to claim 1, further comprising: The first input end of the voltage comparison module is connected with the second end of the second resistor, the second input end of the voltage comparison module is connected with a preset reference voltage, and the output end of the voltage comparison module is connected with the controller and used for comparing the voltage at the two ends of the second resistor with the preset reference voltage; and the first end of the main switch is connected with the positive electrode of the high-voltage direct-current power supply, the second end of the main switch is connected with the first common end of each first resistor, and the control end of the main switch is connected with the controller and is used for being disconnected when the voltage at the two ends of the second resistor is larger than the preset reference voltage.
  6. 6. The decompression circuit according to claim 5, further comprising: The input end of the signal isolation module is connected with the output end of the voltage comparison module; And the input end of the signal amplifier is connected with the output end of the signal isolation module, and the output end of the signal amplifier is connected with the controller.
  7. 7. The decompression circuit according to claim 1, further comprising: The first end of the first filter capacitor is respectively connected with the second public end of each first resistor and the voltage acquisition positive end of the universal meter or the oscilloscope, and the second end of the first filter capacitor is respectively connected with the negative electrode of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope; The cathodes of the first voltage stabilizing diodes are respectively connected with the second public end of each first resistor and the voltage acquisition positive end of the universal meter or the oscilloscope, and the anodes of the first voltage stabilizing diodes are respectively connected with the cathodes of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope.
  8. 8. The decompression circuit according to anyone of claims 1 to 7, further comprising a second filter capacitor, a first current limiting resistor, a second current limiting resistor, a clamping module; the first end of the second filter capacitor is respectively connected with the negative electrode of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope, and the second end of the second filter capacitor is grounded; The first end of the first current limiting resistor is respectively connected with the negative electrode of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope, and the second end of the first current limiting resistor is grounded; The first end of the clamping module is connected with the negative electrode of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope respectively, and the second end of the clamping module is connected with the first end of the second current-limiting resistor; The second end of the second current limiting resistor is grounded.
  9. 9. The decompression circuit according to claim 8, wherein said clamping module comprises a second zener diode and a third zener diode; The cathode of the second zener diode is respectively connected with the cathode of the high-voltage direct-current power supply and the voltage acquisition negative terminal of the universal meter or the oscilloscope, and the anode of the second zener diode is connected with the anode of the third zener diode; And the cathode of the third zener diode is connected with the first end of the second current limiting resistor.
  10. 10. A high-voltage direct-current decompression system is characterized by comprising a shell, a universal meter or an oscilloscope, a high-voltage direct-current power supply and a decompression circuit, wherein the shell is made of insulating materials, the decompression circuit is arranged in the shell and is respectively connected with a voltage acquisition positive end of the universal meter or the oscilloscope, a voltage acquisition negative end of the universal meter or the oscilloscope, a positive electrode of the high-voltage direct-current power supply and a negative electrode of the high-voltage direct-current power supply.

Description

Decompression circuit and high-voltage direct-current decompression system Technical Field The utility model relates to the technical field of electronic information, in particular to a decompression circuit and a high-voltage direct-current decompression system. Background Along with the development of technology, in fields of renewable energy grid connection, ultra-long-distance electric energy transmission, inter-national power grid interconnection and the like, a high-voltage direct current circuit is widely applied by virtue of the fact that the high-voltage direct current circuit is higher in efficiency, lower in loss, better in stability and easier to smooth fluctuation of renewable energy sources during long-distance power transmission, but in actual use, in order to verify whether the voltage of the high-voltage direct current circuit is stable, a high-voltage test special instrument is needed to be adopted for measurement, and the cost of the high-voltage test special instrument is too high. Disclosure of utility model The utility model aims to provide a decompression circuit and a high-voltage direct-current decompression system, which are characterized in that a plurality of first resistors larger than a first preset resistance threshold and a second resistor smaller than a second preset resistance threshold are connected in series between the positive electrode and the negative electrode of a high-voltage direct-current power supply, namely a plurality of high-resistance resistors are connected in series with a low-resistance resistor, and then the voltage at two ends of the second resistor can be tested by a common universal meter or oscilloscope in a voltage division mode, the output voltage of the high-voltage direct-current power supply is determined by the voltage at two ends of the second resistor and the resistance ratio of each first resistor to the second resistor, and whether the voltage output by the high-voltage direct-current power supply is stable or not can be judged by the voltage values at two ends of the second resistor acquired in real time. In order to solve the technical problems, the utility model provides a decompression circuit which comprises a plurality of first resistors and a second resistor, wherein the resistance value of the first resistors is larger than a first preset resistance value threshold, the resistance value of the second resistors is smaller than a second preset resistance value threshold, and the first preset resistance value threshold is larger than the second preset resistance value threshold; The first resistors are connected in series, a first public end is connected with the positive electrode of the high-voltage direct-current power supply, and a second public end is respectively connected with the first end of the second resistor and the voltage acquisition positive end of the universal meter or the oscilloscope; and the second end of the second resistor is respectively connected with the negative electrode of the high-voltage direct-current power supply and the voltage acquisition negative end of the universal meter or the oscilloscope. Optionally, the method further comprises: And the switching devices are connected with the first resistors in one-to-one correspondence in parallel, and the control end is connected with the controller and used for carrying out corresponding on-off based on the control of the controller. Optionally, the method further comprises: The voltage acquisition device comprises an autotransformer, wherein a first end of a primary winding of the autotransformer is connected with an anode of a high-voltage direct-current power supply, a second end of the primary winding of the autotransformer is connected with a cathode of the high-voltage direct-current power supply, a first end of a secondary winding of the autotransformer is connected with a universal meter or a voltage acquisition positive end of an oscilloscope, a second end of the secondary winding of the autotransformer is connected with a voltage acquisition negative end of the universal meter or the oscilloscope, and a secondary winding control end of the autotransformer is connected with a controller for changing the number of turns of the secondary winding of the autotransformer based on the control of the controller. Optionally, the method further comprises: The positive input end of the buck DCDC converter is connected with the positive electrode of the high-voltage direct-current power supply, the negative input end of the buck DCDC converter is connected with the negative electrode of the high-voltage direct-current power supply, the positive output end of the buck DCDC converter is connected with the universal meter or the voltage acquisition positive end of the oscilloscope, the negative output end of the buck DCDC converter is connected with the voltage acquisition negative end of the universal meter or the oscilloscope, and the control end of the buck DC