CN212723066U

CN212723066U - Integrated high-voltage line current detection and temperature detection device

Info

Publication number: CN212723066U
Application number: CN202022081765.6U
Authority: CN
Inventors: 刘将
Original assignee: Shenzhen Jiachuangda Power Supply Technology Co ltd
Current assignee: Shenzhen Jiachuangda Power Supply Technology Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-03-16
Anticipated expiration: 2030-09-21

Abstract

The utility model discloses an integral type high tension line current detection and temperature-detecting device, included the CT circuit, got electric circuit, converting circuit, sampling feedback circuit connects the output, again through keeping apart optoelectronic coupling and connecting PWM control circuit, and transformer pulse width is kept apart in PWM control circuit's output adjustment, measuring coil provides alternating current signal for RS1000 current transformer, carries out comparison and enlargies, provides alternating current signal for check out test set, and temperature measurement probe provides the impedance of a change for check out test set. The utility model has the advantages that: high voltage line does not need independent power supply at check out test set, solves power supply and detection difficult problem together, the utility model discloses the isolation of the switching characteristic of MOS pipe, transformer and opto-coupler, control chip's effective control to and measures such as reference voltage that steady voltage chip provided, safety, high efficiency, stable performance are not fragile, and the interference elimination can generally be applicable to in the check out test set.

Description

Integrated high-voltage line current detection and temperature detection device

Technical Field

The utility model relates to a detection device, more specifically say, relate to integral type high tension line current detection and temperature-detecting device.

Background

The current power supply method of the high-voltage intelligent electrical appliance comprises the following steps: the power supply system comprises a transformer direct power supply, an electromagnetic voltage transformer (PT) power supply, a CT power supply, a solar power generation power supply, a laser power supply and a capacitor series connection voltage division power supply, but the power supply system has many defects.

The high-voltage transformer and the electromagnetic voltage transformer mainly have the functions of realizing voltage transformation, have large volume and high cost, so that the application range is limited, and are particularly not suitable for being used as a primary conversion power supply of an electronic voltage transformer or a power supply of a power transmission line state detection system and the like; the solar power supply needs sunlight for solar power generation, so that the output electric energy is limited by the environment; the laser power supply has high cost, low efficiency and limited service life of optical elements, and the power supply method is limited by places and is not suitable for outdoor; the current transformer induction power taking device is small in size, light in weight and relatively ideal in power supply mode, is strongly influenced by current fluctuation, can ensure normal work of a load only by depending on the cooperation of an energy storage device when a circuit is in an idle load or a low current state close to the idle load, and needs to design a protection circuit load overvoltage when the current is large. Other detection equipment all need supply power for it alone, and is more loaded down with trivial details, if select this kind of integral type high-voltage line current detection and temperature-detecting device, small, light in weight are the ideal selection.

SUMMERY OF THE UTILITY MODEL

The utility model aims to realize getting the electricity and detecting the integration, ordinary check out test set all needs the independent power supply, and the utility model discloses fine solution this a difficult problem.

The utility model adopts the following technical scheme, include: the CT circuit comprises a power taking coil, a measuring coil and a temperature measuring probe; the power-taking circuit comprises a surge suppression circuit, a rectification energy storage circuit, an isolation transformer, a rectification filter circuit, an output circuit, a sampling feedback circuit, a photoelectric isolation circuit and a PWM control circuit, the electricity taking coil is connected with the input end of the electricity taking circuit, after voltage reduction is carried out by the surge suppression circuit, the rectification energy storage circuit and the isolation transformer, then the voltage is transmitted to an output circuit through a rectifying and filtering circuit to provide stable direct current voltage for the RS1000 current converter, and also charges the spare battery, the sampling feedback circuit is connected with the output end and then is connected with the PWM control circuit through isolation photoelectric coupling, the output end of the PWM control circuit adjusts the pulse width of the isolation transformer, the measuring coil provides an alternating current signal for the RS1000 current converter, the alternating current signal is compared and amplified and provided for the detection equipment, and the temperature measuring probe provides variable impedance for the detection equipment.

The utility model has the advantages that: high voltage line does not need independent power supply at check out test set, solves power supply and detection difficult problem together, the utility model discloses the isolation of the switching characteristic of MOS pipe, transformer and opto-coupler, control chip's effective control to and measures such as reference voltage that steady voltage chip provided, safety, high efficiency, stable performance are not fragile, and the interference elimination can generally be applicable to in the check out test set.

The detection equipment has the advantages that the current detection and temperature detection device of the integrated high-voltage line does not need to be additionally supplied with power.

Drawings

Fig. 1 is a block diagram of the present invention;

fig. 2 is a circuit of the surge suppression circuit, the rectification energy storage and conversion part of the utility model;

fig. 3 is a PWM control circuit diagram of the present invention;

fig. 4 is an output circuit diagram of the isolation transformer of the present invention.

Detailed Description

Fig. 1 is a block diagram of the present invention. As shown in fig. 1, the integrated high voltage line current detection and temperature detection apparatus includes: the CT circuit comprises a power taking coil, a measuring coil and a temperature measuring probe; the power-taking circuit comprises a surge suppression circuit, a rectification energy storage circuit, an isolation transformer, a rectification filter circuit, an output circuit, a sampling feedback circuit, a photoelectric isolation circuit and a PWM control circuit, the electricity taking coil is connected with the input end of the electricity taking circuit, after voltage reduction is carried out by the surge suppression circuit, the rectification energy storage circuit and the isolation transformer, then the voltage is transmitted to an output circuit through a rectifying and filtering circuit to provide stable direct current voltage for the RS1000 current converter, and also charges the spare battery, the sampling feedback circuit is connected with the output end and then is connected with the PWM control circuit through isolation photoelectric coupling, the output end of the PWM control circuit adjusts the pulse width of the isolation transformer, the measuring coil provides an alternating current signal for the RS1000 current converter, the alternating current signal is compared and amplified, the alternating current signal is provided for the detection equipment, and the temperature measuring probe provides variable impedance for the detection equipment.

Fig. 2 is the circuit of the surge suppressing circuit, the rectifying energy storage and the converting part of the present invention. As shown in fig. 2, after being rectified by BR1, the smoothed dc voltage obtained by C1 filtering is sent to primary L1-3 of isolation transformer T1.

Fig. 3 is a PWM control circuit diagram of the present invention. As shown in fig. 3, the control circuit includes a control chip U1(UC2845A), a MOS transistor Q1 and a peripheral circuit thereof, the peripheral circuit includes resistors R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, capacitors C3, C4, C5, C6, C7, C8, C9, C10, C11, diodes D1, D2, D3, D4, D5, a primary winding of an isolation transformer T1 has two coils L1-3 and L4-5, which are connected in series through a source and a drain of Q1, a head end of the coil L1-3 is connected to a source of the Q1, and a tail end of the coil L4-5 is connected to a drain 1 of the Q1 through R13; the other end of R13 is connected with the P5 GND end of U1, the (P7) VI end of U1 is connected with R11 to supply power for the chip initially, R11 is connected with the direct current output end of the rectifying circuit and the joint of the primary winding of the isolation transformer T1, the joint is also connected with one ends of R15 and C8, the other ends of R15 and C8 are connected with the cathode of a diode D2, and the anode of D2 is connected with the source of Q1; the (P2) VFB terminal of U1 is connected to one end of R8, the other end of R8 is connected to the output P3 of the isolation optocoupler U2 to control the pulse width (duty ratio) of the output, the (P3) OUT terminal of U3 is connected to R3, the other end of R3 is connected to the gate of Q3, the (P3) GND terminal of U3 is further connected to one ends of capacitors C3 and C3, the other end of C3 is connected to one ends of C3 and R3 (P3) CT/RT terminal of U3, C3 is used for determining the operating frequency of U3, the (P3) CT/RT terminal of U3 is connected to one ends of R3 and C3, the other ends of C3, C3 and R3 are connected to the (P3) ISEN terminal of U3, the other end of R3 is connected to the drain of Q3, the P3 of the optical-electrical isolation U3 is connected to the other end of R3, the P3 is connected to the P3, the P3 (P3) P3, the P3 is connected to the P3 of the P36. After normal operation, L4-5 is rectified by diodes D5 and D3, and filtered by capacitors C11 and C10 to continuously supply power to U1.

Fig. 4 is an output circuit diagram of the isolation transformer of the present invention. As shown in FIG. 4, the secondary side of the isolation transformer T1 has two coils L9-10 and L6-7, the coil L9-10 is rectified by D6, and filtered by C12, L7 and C13, so as to provide stable direct current voltage for the RS1000 current converter and charge a backup battery. The coil L6-7 is rectified by R20 and D7, C14 filters the current and supplies power to U3, P1 and P7 of an operational amplifier U4 pass through R34 to the B pole of Q3, the power is switched on and off, the grid of an MOS transistor Q2 is controlled, so that the output is controlled, P2 and P6 of U4 detect the voltage of an RS1000 current converter, P1 and P7 of U3 output low levels, an optical coupler U2 works, P3 of U2 is connected with P2 of U1 to control the output voltage of VFB, the voltage of U1-P2 drops to be more than the voltage of U1-P6 drops (pulse width is narrowed, duty ratio is reduced), the output voltage is restrained from increasing, so that the output voltage is stabilized, and the wider the control pulse width is the higher.

Adopt this embodiment, high voltage transmission lines need not supply power alone at check out test set, solves power supply and detection difficult problem together, the utility model discloses the isolation of the switching characteristic of MOS pipe, transformer and opto-coupler, control chip's effective control to and measures such as reference voltage that steady voltage chip provided, safety, high efficiency, stable performance, it is not fragile, the interference elimination can generally be applicable to in the check out test set.

Claims

1. Integral type high-tension line current detection and temperature-detecting device, its characterized in that includes: the CT circuit comprises a power taking coil, a measuring coil and a temperature measuring probe; the power taking circuit comprises a surge suppression circuit, a rectification energy storage circuit, an isolation transformer, a rectification filter circuit, an output circuit, a sampling feedback circuit, a photoelectric isolation circuit and a PWM control circuit, the power taking coil is connected with the input end of the power taking circuit, after the voltage of the power taking coil is reduced through the surge suppression circuit, the rectification energy storage circuit and the isolation transformer, the power taking coil passes through the rectification filter circuit to the output circuit, stable direct current voltage is provided for the RS1000 current transformer, meanwhile, a standby battery is charged, the sampling feedback circuit is connected with the output end, the sampling feedback circuit is connected with the PWM control circuit through isolation photoelectric coupling, the pulse width of the isolation transformer is adjusted through the output end of the PWM control circuit, the measuring coil provides alternating current signals for the RS1000 current transformer, comparison amplification is carried out, alternating current signals are provided for the detection equipment, and the temperature measuring.

2. The integrated high-voltage line current detection and temperature detection device according to claim 1, wherein the PWM control circuit comprises a control chip and a MOS tube.