High-voltage capacitor electricity-taking direct-current module

Abstract

The invention discloses an efficient high-voltage electricity taking module which comprises a high-voltage electricity taking capacitor, a main transformer and a stabilizing circuit. External high voltage is firstly reduced through the high-voltage capacitor, electric energy is generated on the primary side of the transformer, and the electric energy is further reduced through the transformer, rectified and then output through the voltage stabilizing circuit. The voltage stabilizing circuit is composed of an internal consumption load and an automatic control circuit. When the output load is reduced, the output energy is reduced by automatically increasing the load of the internal consumption resistor; otherwise, the output energy is increased. Therefore, the stability of the output voltage is realized. According to the high-voltage capacitor electricity taking module, the effect that the internal consumption is the lowest under the high-load operation condition can be achieved, the conversion efficiency of a circuit is improved, the internal loss is basically Ow, all energy is output, and the highest efficiency reaches 99% or above. And the output is direct-current voltage.

Description

Technical Field

[0001] The present invention relates to a power taking circuit, and more particularly to a high voltage capacitor power taking direct current module. Background Art

[0002] High-voltage capacitor power supply technology refers to a technology that converts high-voltage electrical energy of high-voltage transmission lines into safe low-voltage electrical energy. It is usually used to supply stable power to low-voltage control electrical equipment of high-voltage lines and equipment. It can ensure the long-term use of load equipment and is suitable as a reliable power supply equipment for online detection, inspection, anti-theft, control and other electrical equipment on high-voltage transmission lines.

[0003] Based on the method of using batteries as voltage stabilization buffer in the prior art, there is currently a patent in the prior art with patent number 202110144674.9, entitled High Voltage Power Supply Circuit, Device, Control Method and High Voltage Power Supply, which discloses a method of controlling the conduction time of the first field effect tube by a control circuit to achieve the effect of adjusting the output voltage of the first inductor. Compared with the method of using batteries in the prior art, this solves the problem of short working life caused by batteries. However, the control circuit of the above method controls the opening and closing of the first field effect tube, and then realizes voltage stabilization and regulation through the charging and discharging of the first inductor. During the operation, the current needs to flow through the first inductor. In this way, when providing power to a high load, a large switching impact current will flow through the first inductor, causing the first inductor and the field effect tube to heat up seriously, and its conversion efficiency is basically less than 90%. At the same time, since the high voltage on the input line is not stepped down by a capacitor and there is no transformer isolation, it is directly connected to the control system, and the safety is poor. In addition, due to the use of high-frequency modulation, the high-frequency harmonic current is directly connected to the high-voltage side, and its partial discharge characteristics are very poor, and it is easy to interfere with peripheral electrical equipment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a high-voltage capacitor power supply DC module that generates less heat and has the lowest loss when supplying power to a high load, and is safe and reliable.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-voltage capacitor power supply DC module, characterized in that it includes: The power taking circuit is connected to the external high-voltage line to receive the electric energy from the high-voltage line and output the electric energy after isolation and voltage reduction; The rectifier circuit is composed of a rectifier diode Z and capacitors C1 and C2; the rectifier diode Z is connected to the power-taking circuit, the capacitor C2 is connected between the rectifier diode Z and the power-taking circuit, and the capacitor C1 is connected to the output end of the rectifier diode Z to convert the AC voltage output by the power-taking circuit into a DC voltage output; The voltage stabilizing circuit is connected to the rectifier circuit and the output load. The voltage stabilizing circuit has a consumption load and controls the output voltage by adjusting the current of the internal consumption load, thereby achieving the stability of the output voltage. Among them, when the output load becomes smaller, that is, the output current becomes smaller and the output voltage becomes higher, the voltage stabilizing circuit reduces the output voltage by increasing the current flowing through the internal consumption load; when the external load becomes larger, the output voltage is increased by reducing the current on the internal consumption load.

[0006] Alternatively, when the input voltage becomes higher, that is, the output voltage becomes higher, the output voltage is reduced by increasing the current flowing through the internal consumption load; when the input voltage becomes lower, the output voltage is increased by reducing the current on the internal consumption load.

[0007] As a further improvement of the present invention, the voltage stabilizing circuit comprises: A consumption resistor R1, which is a consumption load, one end of which is connected to the output end of the rectifier diode Z and is in parallel with the external output load; The modulation tube Q has a first end connected to the end of the consumption resistor R1, and a second end connected to the output end of the module, and forms a current loop with the consumption resistor R1; the control end receives a signal to adjust the current flowing between the consumption resistor R1 and the output end; A control circuit U, which is connected to the control end of the modulation tube Q to send a signal to the control end of the modulation tube Q; Among them, when the output load becomes smaller or the high-voltage input voltage becomes higher and the output voltage becomes higher, the control circuit U reduces the output voltage by controlling the modulation tube Q to increase the current flowing through the internal consumption resistor R1; when the external load becomes larger or the high-voltage input voltage becomes lower, the control circuit U reduces the current on the internal consumption resistor R1 through the modulation tube Q to increase the output voltage on the output load, thereby stabilizing the output voltage within a certain value.

[0008] As a further improvement of the present invention, the modulator tube Q is a triode, the collector of which is connected to the end of the consumption resistor R1, the emitter is connected to the output end of the overall module, and the base is connected to the control circuit U. The control circuit U controls the current flowing through the consumption resistor R1 by changing the current input into the base.

[0009] As a further improvement of the present invention, the modulator tube Q is a field effect tube, the drain of which is connected to the end of the consumption resistor R1, the source is connected to the output end of the overall module, and the gate is connected to the control circuit U. The control circuit U controls the current flowing through the consumption resistor R1 by changing the duty cycle of the square wave input to the gate.

[0010] As a further improvement of the present invention, the power taking circuit comprises: A step-down capacitor C, one end of which is connected to one end of an external high-voltage line; Transformer T, the input side of the transformer T is connected to the end of the step-down capacitor C, and the other end is connected to the other end of the high-voltage line, forming a high-voltage energy-taking loop to receive the electric energy after the step-down capacitor C, and further step down and isolate the electric energy before outputting it through the output side of the transformer T.

[0011] As a further improvement of the present invention, the control circuit U is also connected to the output load as a sampling signal of the output voltage to form a closed-loop control.

[0012] As a further improvement of the present invention, the output side of the voltage stabilizing circuit is further connected to a diode D and a capacitor C3 and then connected to an output load, thereby playing an isolation and filtering role.

[0013] The beneficial effect of the present invention is that by setting up the power-taking circuit and the voltage-stabilizing circuit, it is possible to simply and effectively realize power taking from the high-voltage line, and output after isolation, step-down and rectification by the transformer. When it is detected that the output load becomes lighter or the high-voltage input voltage becomes higher, the control circuit U increases the current on the internal consumption resistor R1 through the modulation tube Q, thereby reducing the output voltage; when the external load becomes heavier or the high-voltage input voltage becomes lower, the control circuit U decreases the current on the internal consumption load R1 through the modulation tube Q, thereby increasing the output voltage. The overall module output voltage can be stabilized; when there is less consumption under long-term high load conditions, compared with the method in the prior art, the current on the consumption resistor R1 and the modulation tube Q is zero, all the energy is used for output, less heat is generated and the loss is very low, and the maximum conversion efficiency is greater than 99%; the reliability and life under normal operation are improved.

[0014] At the same time, since the energy on the input side of the transformer is always in a balanced state, the current fluctuation and current harmonic components on the primary high-voltage circuit can be effectively reduced, which has greater advantages and significance for the high-voltage ground leakage current power supply device, reducing the amplitude of the local discharge characteristics. In addition, through the setting of capacitor C2, the harmonic current of the circuit can also be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a circuit diagram of the high-voltage capacitor power supply DC module of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in detail with reference to the embodiments shown in the accompanying drawings.

[0017] Reference Figure 1 As shown, a high-voltage capacitor power supply DC module of this embodiment includes: The power taking circuit 1 is connected to an external high-voltage line to receive electric energy from the high-voltage line and output the electric energy after voltage transformation, isolation and voltage reduction; The rectifier circuit is composed of a rectifier diode Z, capacitors C1 and C2; the rectifier diode Z is connected to the power circuit 1, the capacitor C2 is connected between the rectifier diode Z and the power circuit 1, and the capacitor C1 is connected to the output end of the rectifier diode Z to convert the AC voltage output by the power circuit 1 into a DC voltage output; The voltage stabilizing circuit 2 is connected to the rectifier circuit and the output load. The voltage stabilizing circuit 2 has a consumption load, and controls the output voltage by adjusting the current of the internal consumption load, thereby achieving the stability of the output voltage. Among them, when the output load becomes smaller, that is, the output current becomes lighter or the high-voltage input voltage becomes higher, and the output voltage becomes higher, the voltage stabilizing circuit 2 reduces the output voltage by increasing the current flowing through the internal consumption load; when the external load becomes heavier or the high-voltage input voltage becomes lower, the output voltage is increased by reducing the current on the internal consumption load. When using the high-voltage capacitor power supply DC module of this embodiment, it is only necessary to connect the power supply circuit 1 to the external high-voltage line and the voltage stabilizing circuit 2 to the load. In this way, the power supply circuit 1 and the voltage stabilizing circuit 2 are used to obtain power from the high-voltage line, and then a stable DC voltage is output. During the voltage stabilization control by the voltage stabilization circuit 2, compared with the prior art, it can be achieved that under high load conditions, that is, when the power taking module outputs at high or heavy loads, the internal digestion load does not consume energy, and all energy is used for output; therefore, the loss is very low at full power output, and thus very little heat is generated. At the same time, since the detection equipment on the actual high-voltage line basically does not have a no-load operation condition, compared with the existing method, it can effectively achieve the effect of very low overall loss, and through the setting of capacitor C2, the current harmonics of the overall circuit can be reduced. Similarly, when the input voltage (that is, the external line input voltage) becomes higher, the voltage applied to the load is stabilized by increasing the internal consumption. When the input voltage becomes lower, the voltage applied to the output load is stabilized by reducing the internal consumption, thereby achieving output DC voltage stabilization when the input voltage changes.

[0018] As an improved specific implementation, the voltage stabilizing circuit 2 includes: A consumption resistor R1, which is a consumption load, one end of which is connected to the output end of the rectifier diode Z and is in parallel with the external output load; The modulation tube Q has a first end connected to the end of the consumption resistor R1, and a second end connected to an output end of the overall module, and forms a current loop with the consumption resistor R1; the control end receives a signal to adjust the current flowing between the consumption resistor R1 and the output end; A control circuit U, which is connected to the control end of the modulation tube Q to send a signal to the control end of the modulation tube Q; Among them, when the output load becomes lighter, that is, the output current becomes smaller and the output voltage becomes higher, the control circuit U reduces the output voltage by controlling the modulator Q to increase the current flowing through the internal consumption resistor R1; when the external load becomes heavier, the current on the internal consumption resistor R1 is reduced by the modulator Q to increase the output voltage on the output load, so that the output voltage is stabilized within a certain value. By setting the consumption resistor R1, the current value can be effectively adjusted, thereby adjusting the consumption current limit value, that is, the voltage regulation range can be adjusted; and through the combined setting of the modulator Q and the control circuit U, the current flowing through the consumption resistor R1 can be effectively controlled according to the output load change to achieve output voltage regulation.

[0019] As a specific implementation of the improvement of the modulator tube Q, the modulator tube Q is a triode, the collector of the triode is connected to the end of the consumption resistor R1, the emitter is connected to the output end of the overall module, and the base is connected to the control circuit U. The control circuit U controls the current flowing through the consumption resistor R1 by changing the current input into the base, so that the current flowing through the consumption resistor R1 can be regulated by the current amplification principle of the triode.

[0020] As another specific implementation of the improvement of the modulator Q, the modulator Q is a field effect tube, the drain of the field effect tube is connected to the end of the consumption resistor R1, the source is connected to the output end of the overall module, and the gate is connected to the control circuit U. The control circuit U controls the current flowing through the consumption resistor R1 by changing the duty cycle of the square wave input to the gate. By transmitting the PWM signal to the field effect tube Q, the on-time ratio of the modulator Q can be changed by changing the duty cycle of the square wave output by the control circuit U, thereby further changing the current flowing through the consumption resistor R1.

[0021] As an improved specific implementation, the power taking circuit 1 includes: A step-down capacitor C, one end of which is connected to one end of an external high-voltage line; Transformer T, the input side of the transformer T is connected to the end of the step-down capacitor C, and the other end is connected to the other end of the high-voltage line to form a loop to receive the electric energy after the step-down capacitor C, and further step-down and isolate the electric energy through the transformer T and output it through the output side of the transformer T. Through the setting of the step-down capacitor C, the voltage input from the external high-voltage line can be effectively stepped down so that the voltage can be converted by the transformer T. Through the setting of the transformer T, the voltage stepped down by the step-down capacitor C can be further stepped down and output after safe isolation, while reducing the difficulty of the processing technology and the volume and weight of the transformer.

[0022] As an improved specific implementation, the control circuit U is also connected to the external output load end as a sampling signal of the output voltage to form a closed-loop control, thereby increasing the accuracy of the control circuit U in controlling the current flowing through the consumption resistor R1.

[0023] As a specific implementation of the improvement, the output side of the voltage stabilizing circuit 2 is also connected to the output load after being connected with a diode D and a capacitor C3. In this way, through the combined action of the diode D and the capacitor C3, the output load and the voltage stabilizing circuit can be isolated, while reducing the internal current harmonics when the module is running, and further reducing the harmonic current on the input side of the transformer T in the power supply circuit 1.

[0024] To summarize, the high-voltage capacitor power supply DC module of this embodiment can effectively realize the effect of drawing power from the external high-voltage line and then stabilizing the output through the voltage stabilizing circuit 2 by setting the power supply circuit 1 and the voltage stabilizing circuit 2. When the output load is small, the voltage stabilizing circuit 2 increases the internal consumption to stabilize the voltage applied to the load. When the output load is large, the voltage stabilizing circuit 2 reduces the internal consumption to stabilize the voltage applied to the output load, thereby achieving voltage stabilization. At the same time, it can effectively achieve the effect of less consumption and heat generation of the power supply module under high load conditions; at the same time, the current harmonics are smaller and the interference is smaller.

[0025] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high voltage capacitor power supply DC module, characterized in that: include: A power taking circuit (1) is connected to an external high-voltage line to receive electric energy from the high-voltage line and output the electric energy after voltage transformation, isolation and voltage reduction; The rectifier circuit is composed of a rectifier diode Z and capacitors C1 and C2; the rectifier diode Z is connected to the power circuit (1), the capacitor C2 is connected between the rectifier diode Z and the power circuit (1), and the capacitor C1 is connected to the output end of the rectifier diode Z to convert the AC voltage output by the power circuit (1) into a DC voltage output; The voltage stabilizing circuit (2) is connected to the rectifier circuit and also connected to the output load. The voltage stabilizing circuit (2) has a consumption load inside, and the magnitude of the output voltage is controlled by adjusting the current of the internal consumption load, thereby achieving stability of the output voltage. Wherein, when the output load becomes lighter, that is, the output current becomes smaller and the output voltage becomes higher, the voltage stabilizing circuit (2) reduces the output voltage by increasing the current flowing through the internal consumption load; when the output load becomes heavier, the voltage stabilizing circuit (2) increases the output voltage by reducing the current flowing through the internal consumption load; Alternatively, when the input voltage becomes higher, that is, the output voltage becomes higher, the output voltage is reduced by increasing the current flowing through the internal consumption load; when the input voltage becomes lower, the output voltage is increased by reducing the current on the internal consumption load.

2. The high-voltage capacitor power supply DC module according to claim 1, characterized in that: The voltage stabilizing circuit (2) comprises: A consumption resistor R1, which is a consumption load, one end of which is connected to the output end of the rectifier diode Z and is in parallel with the external output load; The modulation tube Q has a first end connected to the end of the consumption resistor R1, a second end connected to the output end of the overall module, and forms a current loop with the consumption resistor R1; the control end receives a signal to adjust the current flowing between the consumption resistor R1 and the output end; A control circuit U, which is connected to the control end of the modulation tube Q to send a signal to the control end of the modulation tube Q; Among them, when the output load becomes lighter or the input voltage becomes higher, that is, the output current becomes smaller and the output voltage becomes higher, the control circuit U reduces the output voltage by controlling the modulation tube Q to increase the current flowing through the internal consumption resistor R1; when the output load becomes heavier or the input voltage becomes lower, the control circuit U reduces the current on the internal consumption resistor R1 through the modulation tube Q to increase the output voltage on the output load, thereby stabilizing the output voltage within a certain value.

3. The high-voltage capacitor power supply DC module according to claim 2 is characterized in that: The modulator Q is a triode, the collector of which is connected to the end of the consumption resistor R1, the emitter is connected to the output end of the overall module, and the base is connected to the control circuit U. The control circuit U controls the current flowing through the consumption resistor R1 by changing the current input into the base.

4. The high-voltage capacitor power supply DC module according to claim 2, characterized in that: The modulator tube Q is a field effect tube, the drain of which is connected to the end of the consumption resistor R1, the source is connected to the output end of the overall module, and the gate is connected to the control circuit U. The control circuit U controls the current flowing through the consumption resistor R1 by changing the duty cycle of the square wave input to the gate.

5. The high-voltage capacitor power supply DC module according to any one of claims 1 to 4, characterized in that: The power taking circuit (1) comprises: A step-down capacitor C, one end of which is connected to one end of an external high-voltage line; Transformer T, the input side of the transformer T is connected to the end of the step-down capacitor C, and the other end is connected to the other end of the high-voltage line, forming a high-voltage energy-taking loop to receive the electric energy after the step-down capacitor C, and further step down and isolate the electric energy before outputting it through the output side of the transformer T.

6. The high-voltage capacitor power supply DC module according to any one of claims 2 to 4, characterized in that: The control circuit U is also connected to an external output load as a sampling signal of the output voltage to form a closed-loop control.

7. The high-voltage capacitor power supply DC module according to any one of claims 1 to 4, characterized in that: The output side of the voltage stabilizing circuit (2) is also connected to a diode D and a capacitor C3 and then to an output load.

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