CN213633594U

CN213633594U - High-voltage sampling circuit compatible with discharging

Info

Publication number: CN213633594U
Application number: CN202021285671.4U
Authority: CN
Inventors: 高三益; 李建军; 郑春阳
Original assignee: Zhixin Control System Co ltd
Current assignee: Zhixin Control System Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-07-06
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a compatible high pressure sampling circuit who releases, keep apart and filter circuit, MCU including partial pressure sampling and bleeder circuit, opto-coupler, two inputs of partial pressure sampling and bleeder circuit are connected with the positive negative pole of waiting to sample the generating line respectively, partial pressure sampling and filter circuit's output passes through the opto-coupler and keeps apart and filter circuit is connected with MCU. The utility model discloses can satisfy sampling circuit and bleeder circuit's function simultaneously, simple structure, with low costs, security are high, save the hardware space.

Description

High-voltage sampling circuit compatible with discharging

Technical Field

The utility model relates to a high pressure sampling technical field, concretely relates to compatible high pressure sampling circuit who releases.

Background

At present, a large number of devices are driven by a direct-current high-voltage power supply, and the normal operation of the devices is often performed under the control of a control system. The control system, in controlling these devices, needs to monitor the voltage of the high voltage drive power supply that powers the device. When the voltage of the high-voltage power supply is within a normal range, the control system controls the equipment to normally operate, and if the voltage of the high-voltage power supply is higher or lower than the normal range, the control system stops the operation of the equipment and sends alarm information. In the process, a direct current high voltage detection method is crucial to the reliable control of the control system. In the direct-current high-voltage detection link, firstly, the correctness of a detection signal is ensured; in addition, one side of the direct current high voltage detection link is connected with high voltage equipment, and the other side of the direct current high voltage detection link is connected with a low voltage control system, so that the direct current high voltage detection link has to have good electrical isolation characteristics of high and low voltage sides in order to ensure the safety of the control system; moreover, the direct-current high-voltage detection link should be simple in structure to save production cost.

A bleeder circuit is a circuit that is capable of discharging the charge stored on a capacitor and causing the voltage on the capacitor to drop rapidly. The servo controller includes a control circuit and a power circuit, wherein the power circuit generally includes a rectifying circuit and an inverter circuit connected by a bus. The inside big electric capacity that all has a number of general machine controller stores the energy for the motor operation, and the electric energy release of storing on the electric capacity is comparatively slow after machine controller falls the electricity, and the time of waiting to release to safe voltage is longer, causes the injury to the circuit easily, and operating personnel operates before the voltage does not reduce to safe value simultaneously and receives the electric shock injury easily.

The existing high-voltage sampling circuit and the bleeder circuit are independent, and as a result, the problems of complex structure and high cost are brought to the whole circuit.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of above-mentioned background art, provide a compatible high pressure sampling circuit who releases.

In order to realize above mesh, the utility model provides a pair of compatible high pressure sampling circuit of releasing, keep apart and filter circuit, MCU including partial pressure sampling and release circuit, opto-coupler, two inputs of partial pressure sampling and release circuit are connected with the positive negative pole of waiting to sample the generating line respectively, partial pressure sampling and filter circuit's output is kept apart through the opto-coupler and filter circuit is connected with MCU.

Preferably, the voltage division sampling and bleeding circuit comprises a plurality of voltage division resistors and a plurality of sampling resistors which are connected in series and in parallel.

Preferably, the number of the divider resistors is 20, the divider resistors are connected in a 2-to-10 series mode, the number of the sampling resistors is 2, and the 2 sampling resistors are sequentially connected in series at one end of the 20 divider resistors.

Preferably, the optical coupling isolation and filtering circuit comprises an ACPL-C87AT-500E optical coupling chip.

Preferably, the optical coupling isolation and filter circuit comprises a TLC2272 rail-to-rail operational amplifier chip.

Preferably, the optical coupling isolation and filter circuit is provided with a clamping tube.

The utility model provides a beneficial effect that technical scheme brought is:

the utility model discloses can satisfy sampling circuit and bleeder circuit's function simultaneously, simple structure, with low costs, security are high, save the hardware space.

Drawings

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

FIG. 2 is a circuit diagram of a divided voltage sampling and bleeding circuit;

fig. 3 is a circuit diagram of an opto-isolator and filter circuit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the high-voltage sampling circuit compatible with discharging comprises a voltage division sampling and discharging circuit, an optical coupling isolation and filter circuit and an MCU, wherein two input ends of the voltage division sampling and discharging circuit are respectively connected with the positive electrode and the negative electrode of a bus to be sampled, and the output end of the voltage division sampling and filter circuit is connected with the MCU through the optical coupling isolation and filter circuit.

As shown in fig. 2, the voltage division sampling and bleeding circuit includes 20 voltage division resistors (R184-R195, R750-R756, R758) connected in series-parallel and 2 sampling resistors R53, R760, 20 of the voltage division resistors are connected in series by 2-10 series, 2 of the sampling resistors are connected in series at one end of 20 voltage division resistors in sequence, if the resistance values of 20 voltage division resistors are all R₀And 2 the resistance values of the sampling resistors are all R₁The formula of the partial pressure is Vo ═Vi*(2R₁/5R₀+2R₁)。

As shown in fig. 3, the optical coupling isolation and filter circuit includes an ACPL-C87AT-500E optical coupling chip and a TLC2272 rail-to-rail operational amplifier chip,

pins

1 and 8 of the ACPL-C87AT-500E optical coupling chip are both connected with a +5V power supply, pin 2 is connected with an output end of a voltage division sampling and bleeding circuit through a resistor R759,

pins

3, 4 and 5 are grounded,

pins

6 and 7 are connected with an input end of an operational amplifier following and filtering circuit, a capacitor C739 is connected in parallel between pins 2 and 3 of the ACPL-C87AT-500E optical coupling chip, pin 8 is grounded through a capacitor C135, pin 1 of the TLC2272 rail-to-rail operational amplifier chip is connected with an MCU through a resistor R775, pins 2 and 3 are connected with

pins

6 and 7 of the ACPL-C87AT-500E optical coupling chip through resistors R770 and R771, respectively, a resistor R772 and a capacitor C736 are connected in parallel between pins 1 and 2 of the TLC 72 rail-to-rail operational amplifier chip, the pin 3 is grounded through a resistor R773, a capacitor C735 is connected in parallel with two ends of the resistor R773, the output end of the resistor R775 is grounded through a capacitor C210, and a clamping tube is arranged at the output end of the resistor R775 and comprises two reversely connected diodes.

The utility model discloses a concrete theory of operation does:

in the sampling process, the high voltage between the positive and negative of the bus is divided by a resistor in the voltage division sampling and discharge circuit and then converted into low voltage, then isolated by an optical coupler, and transmitted to the MCU for A/D conversion and final treatment after operational amplifier following and filtering.

In the discharging process, the resistor in the partial pressure sampling and discharging circuit is used as a discharging resistor to discharge the voltage on the bus capacitor, and the resistor in the partial pressure sampling and discharging circuit is calculated by using a discharging formula according to the actual bus low voltage and the voltage and time needing to be discharged. Considering the power consumption of the resistor and the derating situation at high temperature, the power on the resistor does not exceed 1/2 of the power of the resistor itself as much as possible.

Other parts not described in detail are known in the art.

Claims

1. The utility model provides a compatible high pressure sampling circuit who releases which characterized in that: including partial pressure sampling and bleeder circuit, opto-coupler isolation and filter circuit, MCU, partial pressure sampling and bleeder circuit's two inputs are connected with the positive negative pole of treating the sampling generating line respectively, partial pressure sampling and filter circuit's output is kept apart through the opto-coupler and filter circuit is connected with MCU.

2. The bleeding compatible high voltage sampling circuit of claim 1, wherein: the voltage division sampling and discharging circuit comprises a plurality of voltage division resistors and a plurality of sampling resistors which are connected in series and in parallel.

3. The bleeding compatible high voltage sampling circuit of claim 2, wherein: the quantity of divider resistance is 20, adopts 2 and 10 series connection modes to connect, the quantity of sampling resistance is 2, 2 sampling resistance establishes ties in proper order at 20 divider resistance one end.

4. The bleeding compatible high voltage sampling circuit of claim 1, wherein: the optical coupling isolation and filtering circuit comprises an ACPL-C87AT-500E optical coupling chip.

5. The bleeding compatible high voltage sampling circuit of claim 1, wherein: the optical coupling isolation and filter circuit comprises a TLC2272 rail-to-rail operational amplifier chip.

6. The bleeding compatible high voltage sampling circuit of claim 1, wherein: the optical coupling isolation and filter circuit is provided with a clamping tube.