CN112986657A - Self-powered direct-current voltage measurement control circuit and measurement device - Google Patents
Self-powered direct-current voltage measurement control circuit and measurement device Download PDFInfo
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- CN112986657A CN112986657A CN202110493973.3A CN202110493973A CN112986657A CN 112986657 A CN112986657 A CN 112986657A CN 202110493973 A CN202110493973 A CN 202110493973A CN 112986657 A CN112986657 A CN 112986657A
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Abstract
The invention provides a self-powered direct-current voltage measurement control circuit and a self-powered direct-current voltage measurement device, which belong to the technical field of voltage measurement, and comprise a primary side module, a secondary side module and a power supply module, wherein the primary side module is used for generating a corresponding current signal according to an input high-voltage signal and outputting the current signal and an oscillation signal; the voltage transformation module is connected with the primary side module and converts a high-voltage signal into a low-voltage signal according to the oscillation signal; and the output module is connected with the voltage transformation module and is used for outputting the low-voltage signal after rectification and filtering. According to the self-powered direct-current voltage measurement control circuit, the two-way voltage division circuit is adopted, the second voltage division circuit independently supplies power to the oscillating circuit, the self-powered function is realized, an additional external power supply is not needed, the use cost and the space are greatly reduced, the influence of the current consumption of the oscillating circuit on the overall measurement precision and the measurement range is avoided, and the measurement precision and the measurement range are improved.
Description
Technical Field
The invention belongs to the technical field of voltage measurement, and particularly relates to a self-powered direct-current voltage measurement control circuit and a self-powered direct-current voltage measurement control device.
Background
In high power dc power applications, the system needs to perform isolated measurement and control of the dc high voltage. The existing direct current voltage measuring device mainly adopts methods such as a magnetic balance principle, a magnetic modulation principle, photoelectric isolation, digital isolation and the like to realize isolation measurement of direct current high voltage, and the methods all need to provide an independent standard power supply; the introduction of a standard power supply will increase the cost and complexity of the system, and especially in the field reconstruction, it is difficult to add the standard power supply and the power supply connecting wire due to the structural limitation, which limits the application of the sensor.
The existing passive direct current voltage measuring device has the defects of large temperature drift coefficient, poor mechanical vibration performance and the like, and because the passive direct current voltage measuring device adopts a single-way resistor for voltage division, the measuring precision and the measuring range of the passive direct current voltage measuring device are limited by the consumed current of an oscillating circuit.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a self-powered direct-current voltage measurement control circuit and a self-powered direct-current voltage measurement control device which have the characteristics of high measurement precision, large measurement range, small temperature drift, high safety and the like.
The invention aims to provide a self-powered direct-current voltage measurement control circuit, which comprises: the primary side module is used for generating a corresponding current signal according to an input high-voltage signal and outputting a current signal and an oscillation signal; the voltage transformation module is connected with the primary side module and converts a high-voltage signal into a low-voltage signal according to the oscillation signal; the output module is connected with the voltage transformation module and is used for outputting the low-voltage signal after rectification and filtering; the primary side module comprises a first voltage division circuit, a second voltage division circuit and an oscillating circuit, wherein the second voltage division circuit is respectively connected with the first voltage division circuit and the oscillating circuit and supplies power to the oscillating circuit.
In the aforementioned self-powered dc voltage measurement control circuit, the self-powered dc voltage measurement control circuit further includes a compensation module, where the compensation module includes:
the temperature compensation circuit is used for carrying out temperature compensation on the primary side module;
and the coil compensation circuit is used for performing linear compensation on the voltage transformation module.
In the aforementioned self-powered dc voltage measurement control circuit, the first voltage divider circuit includes: a resistor R1, a resistor R2, a resistor R8, a resistor R9 and a voltage stabilizing diode VS 2;
one end of the resistor R1 is connected with a high-voltage input end HT + and the second voltage-dividing circuit respectively, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the temperature compensation circuit, the other end of the temperature compensation circuit is connected with the negative electrode of the voltage stabilizing diode VS2, the positive electrode of the voltage stabilizing diode VS2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with one end of the resistor R8, and the other end of the resistor R8 is connected with the high-voltage input end HT-and the second voltage-dividing circuit respectively.
In the aforementioned self-powered dc voltage measurement control circuit, the second voltage division circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7 and the voltage stabilizing diode VS 1;
one end of the resistor R4 is connected to the first voltage dividing circuit, the other end of the resistor R4 is connected to the resistor R5, one end of the resistor R5, which is far away from the resistor R4, is connected to the cathode of the zener diode VS1, the anode of the zener diode VS1 is connected to the resistor R6, one end of the resistor R6, which is far away from the zener diode VS1, is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the first voltage dividing circuit.
In the self-powered dc voltage measurement control circuit, the oscillation circuit includes an oscillator N1 and a MOS transistor Q1, an input terminal of the oscillator N1 is connected in parallel to two terminals of the zener diode VS1, an output terminal of the oscillator N1 is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to the first voltage dividing circuit, and a drain of the MOS transistor Q1 is connected to the voltage transforming module.
In the self-powered dc voltage measurement control circuit, the transformer module includes a transformer T1, a first port of the transformer T1 is connected to a negative electrode of the zener diode VS2, a second port of the transformer T1 is connected to a drain of the MOS transistor Q1, and a third port and a fourth port of the transformer T1 are both connected to the output module.
In the self-powered direct-current voltage measurement control circuit, the output module includes a resistor R11, a resistor R12, a resistor R13, a capacitor C2, a capacitor C3, a diode VD1, and a diode VD 2;
the anode of the diode VD1 is connected to the third port of the transformer T1, the cathode of the diode VD1 is connected to the cathodes of the resistor R11 and the diode VD2, the anode of the diode VD2 is connected to the fourth port of the transformer T1, one end of the resistor R11, which is far away from the diode VD1, is connected to the resistor R12, one end of the resistor R11, which is connected to the resistor R12, is connected to the low-voltage output terminal V "through the capacitor C2, one end of the resistor R12, which is far away from the resistor R11, is connected to the low-voltage output terminal V +, one end of the resistor R12, which is connected to the low-voltage output terminal V + through the capacitor C3, and the resistor R13 is connected in parallel to both ends of the capacitor C3.
The present invention also provides a self-powered dc voltage measuring device, comprising: the device comprises a shell, a first cavity, a second cavity and a third cavity which are sequentially connected are formed in the shell through partition plates, wherein a primary side circuit board is placed in the first cavity, and a primary side module of the self-powered direct-current voltage measurement control circuit is arranged on the primary side circuit board; a transformer is arranged in the second cavity, and the transformer comprises a transformation module of the self-powered direct-current voltage measurement control circuit; an output circuit board is placed in the third cavity, and the output circuit board comprises an output module of the self-powered direct-current voltage measurement control circuit; the transformer is respectively connected with the primary circuit board and the output circuit board through connecting wires.
In the self-powered dc voltage measuring device, a first colloid is filled in the first cavity and the second cavity, a second colloid is filled in the third cavity, and a height difference exists between the first colloid and the second colloid.
In the self-powered dc voltage measuring device, the housing is provided with a primary screw for connecting an input high voltage and an output screw for outputting a low voltage, wherein the primary screw is connected to the primary circuit board, and the output screw is connected to the output circuit board.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the self-powered direct-current voltage measurement control circuit, the two-way voltage division circuit is adopted, the second voltage division circuit is used for independently supplying power to the oscillation circuit, the self-powered function is realized, an additional external power supply is not needed, the use cost and the space are greatly reduced, the influence of the current consumption of the oscillation circuit on the overall measurement precision and the measurement range is avoided, and the measurement precision and the measurement range are improved;
2. the self-powered direct-current voltage measuring device structurally adopts partitioned isolation assembly and glue filling isolation fixation, and the temperature compensation circuit is used on the circuit, so that the influence of temperature rise of the voltage division circuit on the output module is reduced, the measurement temperature drift is greatly reduced, and the measurement precision is improved.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
FIG. 3 is a schematic diagram of the structure of the present invention after being filled with colloid.
In the figure, 100, the housing; 110. a first cavity; 111. a primary side circuit board; 112. a first support column; 120. a second cavity; 130. a third cavity; 131. an output circuit board; 132. a second support column; 140. a first colloid; 150. a second colloid; 160. a primary screw; 170. an output screw; t1, transformer.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
As shown in fig. 1 to 3, the present invention provides a self-powered dc voltage measurement control circuit, including: the primary side module is used for generating a corresponding current signal according to an input high-voltage signal and outputting a current signal and an oscillation signal; the voltage transformation module is connected with the primary side module and converts a high-voltage signal into a low-voltage signal according to the oscillation signal; the output module is connected with the voltage transformation module and is used for outputting the low-voltage signal after rectification and filtering; the primary side module comprises a first voltage division circuit, a second voltage division circuit and an oscillating circuit, wherein the second voltage division circuit is respectively connected with the first voltage division circuit and the oscillating circuit and supplies power to the oscillating circuit.
According to the self-powered direct-current voltage measurement control circuit, the two-way voltage division circuit is adopted, the second voltage division circuit independently supplies power to the oscillating circuit, the self-powered function is realized, an additional external power supply is not needed, the use cost and the space are greatly reduced, the influence of the current consumption of the oscillating circuit on the overall measurement precision and the measurement range is avoided, and the measurement precision and the measurement range are improved.
Preferably, as shown in fig. 1 to 3, a compensation module is included, the compensation module including:
the temperature compensation circuit is used for carrying out temperature compensation on the primary side module;
and the coil compensation circuit is used for performing linear compensation on the voltage transformation module.
In this embodiment, the temperature compensation circuit includes a thermistor R3, one end of which is connected to the resistor R2 and the other end of which is connected to the zener diode VS 2. The temperature compensation circuit is used for compensating the overall resistance value of the first voltage division circuit when the resistance value of the first voltage division circuit changes due to temperature changes, so that the resistance value of the first voltage division circuit is kept stable, and further the equal proportion conversion of voltage and current is ensured; the coil compensation circuit comprises a resistor R10 and a capacitor C1, one end of the resistor R10 is connected with the first port of the transformer T1, the other end of the resistor R10 is connected with the capacitor C1, and one end of the capacitor C1 far away from the resistor R10 is connected with the first port of the transformer T1. The coil compensation circuit and the primary coil of the transformer T1 form a resonance circuit, which is used for compensating the non-linear change of the transformer T1 caused by different measuring voltages and providing an energy discharge path for the coil, thereby improving the measuring precision. When the MOS transistor Q1 is turned off, the coil compensation circuit provides an energy release path for the primary coil of the transformer T1, so as to prevent the primary coil of the transformer T1 from being damaged by overvoltage, and when the MOS transistor Q1 is turned on, the coil compensation circuit can be charged while regulating the current in the primary coil of the transformer T1.
Preferably, as shown in fig. 1 to 3, the first voltage dividing circuit includes: a resistor R1, a resistor R2, a resistor R8, a resistor R9 and a voltage stabilizing diode VS 2;
one end of the resistor R1 is connected with a high-voltage input end HT + and the second voltage-dividing circuit respectively, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the temperature compensation circuit, the other end of the temperature compensation circuit is connected with the negative electrode of the voltage stabilizing diode VS2, the positive electrode of the voltage stabilizing diode VS2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with one end of the resistor R8, and the other end of the resistor R8 is connected with the high-voltage input end HT-and the second voltage-dividing circuit respectively.
In this embodiment, the first voltage divider circuit converts an input high voltage into a current in an equal proportion through a resistor, and simultaneously protects the MOS transistor Q1 through the zener diode VS2, so that when the MOS transistor Q1 is turned off, the first voltage divider circuit can reduce damage to the MOS transistor Q1 caused by surge impact and common mode interference, and further limit the current of the MOS transistor Q1 through conduction of the zener diode VS 2.
Preferably, as shown in fig. 1 to 3, the second voltage division circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7 and the voltage stabilizing diode VS 1;
one end of the resistor R4 is connected to the first voltage dividing circuit, the other end of the resistor R4 is connected to the resistor R5, one end of the resistor R5, which is far away from the resistor R4, is connected to the cathode of the zener diode VS1, the anode of the zener diode VS1 is connected to the resistor R6, one end of the resistor R6, which is far away from the zener diode VS1, is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the first voltage dividing circuit.
In this embodiment, the second voltage division circuit divides the input voltage and limits the current and then provides a power supply for the oscillation circuit, an additional external power supply is not needed, the use space and the cost are saved, and the applicability of the direct-current voltage measuring device is greatly improved.
Preferably, as shown in fig. 1 to fig. 3, the oscillation circuit includes an oscillator N1 and a MOS transistor Q1, an input end of the oscillator N1 is connected in parallel to two ends of the zener diode VS1, an output end of the oscillator N1 is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to the first voltage dividing circuit, and a drain of the MOS transistor Q1 is connected to the voltage transforming module.
Further preferably, the voltage transformation module includes a transformer T1, a first port of the transformer T1 is connected to a negative electrode of the zener diode VS2, a second port of the transformer T1 is connected to a drain of the MOS transistor Q1, and a third port and a fourth port of the transformer T1 are both connected to the output module.
Further preferably, the oscillator N1 is a low-square wave oscillator.
In the embodiment, a square wave signal with a certain frequency is generated by the low-power square wave oscillator N1, and the square wave signal controls the conversion of the signal of the voltage transformation module to realize the linear transmission of the measurement signal. When the square wave signal is a high level signal, the MOS transistor Q1 is turned on, the current signal flows through the MOS transistor Q1 through the primary coil of the transformer T1, the zener diode VS2 is not turned on, that is, a large current flows through the transformer T1; when the square wave signal is a low level signal, the MOS transistor Q1 is turned off, a current flows out through the zener diode VS2, a current flowing through the primary coil of the transformer T1 is reduced, and a current flows into the coil compensation circuit. The low-consumption square wave oscillator N1 generates alternating current signals in the primary coil of the transformer T1 by continuously generating alternating square wave signals, the transformer T1 generates corresponding low-voltage signals in the secondary coil of the transformer T1 according to the high-voltage alternating current signals, the low-voltage signals are transmitted to the output module, and the measurement control of the high-voltage signals is realized by measuring the low-voltage signals.
Preferably, as shown in fig. 1 to 3, the output module includes a resistor R11, a resistor R12, a resistor R13, a capacitor C2, a capacitor C3, a diode VD1, and a diode VD 2;
the anode of the diode VD1 is connected to the third port of the transformer T1, the cathode of the diode VD1 is connected to the cathodes of the resistor R11 and the diode VD2, the anode of the diode VD2 is connected to the fourth port of the transformer T1, one end of the resistor R11, which is far away from the diode VD1, is connected to the resistor R12, one end of the resistor R11, which is connected to the resistor R12, is connected to the low-voltage output terminal V "through the capacitor C2, one end of the resistor R12, which is far away from the resistor R11, is connected to the low-voltage output terminal V +, one end of the resistor R12, which is connected to the low-voltage output terminal V + through the capacitor C3, and the resistor R13 is connected in parallel to both ends of the capacitor C3.
In this embodiment, the output module rectifies and filters the low-voltage ac signal generated by the secondary coil of the transformer T1 and outputs a low-voltage dc signal, thereby implementing isolation measurement of the dc high-voltage signal.
The invention also provides a self-powered direct-current voltage measuring device, which is characterized by comprising the following components: a housing 100, the interior of the housing 100 is divided into a first cavity 110, a second cavity 120, and a third cavity 130 by a partition board, which are connected in sequence, wherein a primary side circuit board 111 is disposed in the first cavity 110, the primary side circuit board 111 includes a primary side module of the self-powered dc voltage measurement control circuit, a transformer T1 is disposed in the second cavity 120, the transformer T1 includes a transformation module of the self-powered dc voltage measurement control circuit, an output circuit board 131 is disposed in the third cavity 130, the output circuit board 131 includes an output module of the self-powered dc voltage measurement control circuit, and the transformer T1 is connected to the primary side circuit board 111 and the output circuit board 131 by a connection line.
It is further preferable that a first supporting column 112 for supporting the primary circuit board 111 and a second supporting column 132 for supporting the output circuit board 131 are provided in the housing 100.
In this embodiment, the three cavities separated from each other are disposed inside the housing 100, the primary circuit board 111, the transformer T1, and the output circuit board 131 are respectively disposed in the three cavities, and the primary circuit board 111 and the output circuit board 131 are fixed by the support posts, insulated and fixed to each other, and connected by the connection wires, so that adverse phenomena such as short circuit caused by mutual contact are avoided.
Preferably, as shown in fig. 1 to 3, a first colloid 140 is filled in the first cavity 110 and the second cavity 120, a second colloid 150 is filled in the third cavity 130, and a height difference exists between the first colloid 140 and the second colloid 150.
Further preferably, the first colloid 140 is organic silica gel, and the second colloid 150 is epoxy gel.
In this embodiment, the cavities in which the primary circuit board 111 and the transformer T1 are located are filled with silicone rubber having good thermal conductivity, so that the primary circuit board 111 and the transformer T1 are fixed while heat dissipation during operation is facilitated, and the cavity in which the output circuit board 131 is located is filled with epoxy silicone rubber having poor thermal conductivity, so that the output circuit board 131 is fixed while the influence of temperature rise in the first cavity 110 and the second cavity 120 on the output circuit board 131 is reduced. In addition, the filling height of the colloids on the two sides has a height difference, so that on one hand, heat transfer can be avoided, and on the other hand, the automation of colloid pouring can be conveniently realized.
Preferably, as shown in fig. 1 to 3, a primary screw 160 for connecting an input high voltage and an output screw 170 for outputting a low voltage are disposed on the housing 100, wherein the primary screw 160 is connected to the primary circuit board 111, and the output screw 170 is connected to the output circuit board 131.
In this embodiment, the primary screw 160 is connected to the primary circuit board 111 through a connection line for connecting to an input high voltage, and the output screw 170 is connected to the output circuit board 131 through a connection line for outputting a low voltage signal, and when measuring, only the high voltage input end is connected to the primary screw 160, and the measuring end is connected to the output screw 170, so that the dc high voltage can be isolated and measured, which is convenient for operation and high in safety.
It should be noted that the descriptions related to "first", "second", "a", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicit indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The terms "connected," "fixed," and the like are to be construed broadly, e.g., "fixed" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A self-powered dc voltage measurement control circuit, comprising:
the primary side module is used for generating a corresponding current signal according to an input high-voltage signal and outputting a current signal and an oscillation signal;
the voltage transformation module is connected with the primary side module and converts a high-voltage signal into a low-voltage signal according to the oscillation signal;
the output module is connected with the voltage transformation module and is used for outputting the low-voltage signal after rectification and filtering;
the primary side module comprises a first voltage division circuit, a second voltage division circuit and an oscillating circuit, wherein the second voltage division circuit is respectively connected with the first voltage division circuit and the oscillating circuit and supplies power to the oscillating circuit.
2. A self-powered dc voltage measurement control circuit according to claim 1, comprising a compensation module comprising:
the temperature compensation circuit is used for carrying out temperature compensation on the primary side module;
and the coil compensation circuit is used for performing linear compensation on the voltage transformation module.
3. A self-powered dc voltage measurement control circuit according to claim 2, wherein said first voltage divider circuit comprises: a resistor R1, a resistor R2, a resistor R8, a resistor R9 and a voltage stabilizing diode VS 2;
one end of the resistor R1 is connected with a high-voltage input end HT + and the second voltage-dividing circuit respectively, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the temperature compensation circuit, the other end of the temperature compensation circuit is connected with the negative electrode of the voltage stabilizing diode VS2, the positive electrode of the voltage stabilizing diode VS2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with one end of the resistor R8, and the other end of the resistor R8 is connected with the high-voltage input end HT-and the second voltage-dividing circuit respectively.
4. A self-powered dc voltage measurement control circuit according to claim 1, wherein said second voltage divider circuit comprises: the resistor R4, the resistor R5, the resistor R6, the resistor R7 and the voltage stabilizing diode VS 1;
one end of the resistor R4 is connected to the first voltage dividing circuit, the other end of the resistor R4 is connected to the resistor R5, one end of the resistor R5, which is far away from the resistor R4, is connected to the cathode of the zener diode VS1, the anode of the zener diode VS1 is connected to the resistor R6, one end of the resistor R6, which is far away from the zener diode VS1, is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the first voltage dividing circuit.
5. A self-powered DC voltage measurement control circuit as claimed in claim 4, wherein the oscillation circuit comprises an oscillator N1 and a MOS transistor Q1, the input terminal of the oscillator N1 is connected in parallel to the two terminals of the voltage regulator diode VS1, the output terminal of the oscillator N1 is connected to the gate of the MOS transistor Q1, the source of the MOS transistor Q1 is connected to the first voltage-dividing circuit, and the drain of the MOS transistor Q1 is connected to the voltage transformation module.
6. A self-powered DC voltage measurement control circuit as claimed in claim 5, wherein said transforming module comprises a transformer T1, a first port of said transformer T1 is connected to the cathode of said zener diode VS2, a second port of said transformer T1 is connected to the drain of said MOS transistor Q1, and a third port and a fourth port of said transformer T1 are connected to said output module.
7. The self-powered direct-current voltage measurement control circuit of claim 6, wherein the output module comprises a resistor R11, a resistor R12, a resistor R13, a capacitor C2, a capacitor C3, a diode VD1 and a diode VD 2;
the anode of the diode VD1 is connected to the third port of the transformer T1, the cathode of the diode VD1 is connected to the cathodes of the resistor R11 and the diode VD2, the anode of the diode VD2 is connected to the fourth port of the transformer T1, one end of the resistor R11, which is far away from the diode VD1, is connected to the resistor R12, one end of the resistor R11, which is connected to the resistor R12, is connected to the low-voltage output terminal V "through the capacitor C2, one end of the resistor R12, which is far away from the resistor R11, is connected to the low-voltage output terminal V +, one end of the resistor R12, which is connected to the low-voltage output terminal V + through the capacitor C3, and the resistor R13 is connected in parallel to both ends of the capacitor C3.
8. A self-powered dc voltage measurement device, comprising:
a housing, the interior of which is divided into a first cavity, a second cavity and a third cavity which are connected in sequence by a partition board, wherein a primary side circuit board is placed in the first cavity, and the primary side circuit board comprises a primary side module of the self-powered direct current voltage measurement control circuit as claimed in any one of claims 1 to 7; a transformer is placed in the second cavity, and the transformer comprises a transformation module of the self-powered direct current voltage measurement control circuit of any one of claims 1 to 7; an output circuit board is placed in the third cavity, and an output module of the self-powered direct current voltage measurement control circuit is arranged on the output circuit board and comprises the self-powered direct current voltage measurement control circuit of any one of claims 1 to 7; the transformer is respectively connected with the primary circuit board and the output circuit board through connecting wires.
9. A self-powered dc voltage measuring device according to claim 8, wherein the first cavity and the second cavity are filled with a first colloid, the third cavity is filled with a second colloid, and a height difference exists between the first colloid and the second colloid.
10. The self-powered direct-current voltage measuring device according to claim 9, wherein a primary screw for connecting an input high voltage and an output screw for outputting a low voltage are disposed on the housing, wherein the primary screw is connected to the primary circuit board, and the output screw is connected to the output circuit board.
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| CN112986657B (en) | 2021-08-13 |
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