CN212207514U - A relay control circuit and a DC resistance test device for a capacitor discharge coil - Google Patents

Abstract

The utility model provides a relay control circuit. The relay control circuit includes an input interface group, an output interface group, a test branch and several correction branches; the input interface group includes a first input interface and a second input interface, and an output interface group It includes a first output interface and a second output interface; any one of the several calibration branches is connected in parallel with the test branch between the first input interface and the first output interface, and the second input interface and the second output interface Direct connection; the test branch includes a test switch; any one of the several correction branches includes a series-connected correction switch and a correction resistor. The test branch and the correction branch are integrated in the relay circuit, which can conveniently realize the function of correcting the current sensor and measuring the resistance value of the discharge coil, and has good operation convenience. In addition, the utility model also provides a capacitor discharge coil DC resistance testing device.

Description

A relay control circuit and a DC resistance test device for a capacitor discharge coil

technical field

The utility model relates to the field of detection, in particular to a relay control circuit and a DC resistance test device of a capacitor discharge coil.

Background technique

The discharge coil is a special auxiliary equipment for the high-voltage parallel capacitor device. It is directly connected to the terminals of the capacitor bank. When the capacitor is disconnected from the power grid, the stored charge is discharged by itself, and the residual voltage of the capacitor is reduced to below the specified value within a specified time. It is one of the main technical measures for the capacitor device to ensure the safety of the equipment itself and maintenance personnel. Therefore, the measurement of the DC resistance value of the discharge coil is a relatively important work.

In the specific implementation, the DC resistance value of the discharge coil is generally measured by using Ohm's law, that is, by applying pressure to both ends of the discharge coil and measuring the current value flowing through the discharge coil, the DC resistance value of the discharge coil is finally obtained by using Ohm's law. . In order to ensure the accuracy of the obtained current value, the current sensor usually needs to be calibrated in daily use.

In a specific implementation, the calibration of the current sensor and the measurement of the current value of the discharge coil need to be realized by various devices, which is inconvenient to operate and takes a long time to operate.

Utility model content

The utility model provides a DC resistance test device for a capacitor discharge coil of a relay control circuit. The relay circuit integrates a test branch and a correction branch. Through the external control of the control switches on the test branch and the correction branch, it can be compared The calibration of the current sensor and the measurement of the current value of the discharge coil are conveniently realized, and the operation is convenient.

Correspondingly, the present invention also provides a relay control circuit, the relay control circuit includes an input interface group, an output interface group, a test branch and several correction branches; the input interface group includes a first input interface and a a second input interface, the output interface group includes a first output interface and a second output interface;

Any one of the several correction branches is connected in parallel with the test branch between the first input interface and the first output interface, and the second input interface and the second output interface are directly connected;

The test branch includes a test switch; any correction branch in the several correction branches includes a correction switch and a correction resistor arranged in series, and the resistances of the correction resistors of different correction branches in the several correction branches are different values;

The calibration switches in the several calibration branches and the test switches in the test branches respectively have switch control terminals.

An optional embodiment, further comprising a discharge branch;

Both ends of the discharge branch are respectively connected between the first input interface and the second input interface, or both ends of the discharge branch are respectively connected between the second input interface and the second output interface;

The discharge branch includes a discharge switch and a discharge resistor arranged in series;

The discharge switch of the discharge branch has a switch control terminal.

Correspondingly, the utility model also provides a capacitor discharge coil DC resistance testing device, which includes an adjustable working power supply, a current sensor, a processor module and the relay control circuit;

The adjustable working power supply has a voltage regulation output end and a voltage regulation control end, and the voltage regulation output end is connected with the input interface group;

The current sensor has a current signal output terminal and a test terminal;

The processor module has a voltage regulation output terminal, a current signal receiving terminal, a test switch terminal and several calibration switch terminals; the voltage regulation output terminal is connected to the voltage regulation control terminal, and the current signal receiving terminal is connected to the voltage regulation control terminal. Current signal output terminal connection;

The test switch terminal is connected to the control terminal of the test switch, and the several calibration switch terminals are respectively connected to the control terminals of the correction switches of the several correction branches.

An optional embodiment further includes a power supply circuit.

In an optional implementation manner, the output voltage range of the adjustable working power supply is 0V to 50V.

In an optional implementation manner, the circuit sensor is a Hall current sensor.

Optional embodiments also include several peripheral devices for display and/or control.

In an optional implementation manner, the plurality of peripheral devices include a display screen;

The processor module has a display output terminal, and the display output terminal is connected to the display screen.

In an optional implementation manner, the plurality of peripheral devices include a controller;

The processor module has a control receiving end connected with the controller.

To sum up, the present utility model provides a relay control circuit and a DC resistance test device for a capacitor discharge coil. The relay control circuit integrates a test branch, a test branch and a correction branch. The branch circuit control can conveniently realize the correction of the current sensor, the measurement of the DC resistance of the capacitor discharge coil and the discharge function of the high-voltage parallel capacitor device, which has good operation convenience; the DC resistance test equipment of the capacitor discharge coil can control the relay through the processor module. The access control of different branches of the circuit and different wiring methods can realize the correction of the current sensor, the measurement of the DC resistance of the capacitor discharge coil and the discharge function of the high-voltage parallel capacitor device, which has good operational convenience.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 shows a schematic structural diagram of a capacitor discharge coil DC resistance testing device according to an embodiment of the present invention;

2 shows a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;

Figure 3 shows a schematic diagram of the processor structure of the STM32F103xx;

4 shows a schematic flowchart of a method for testing the DC resistance of a capacitor discharge coil according to an embodiment of the present invention;

5 shows a schematic structural diagram of a correction circuit for measuring the DC resistance of a capacitor discharge coil according to an embodiment of the present invention;

6 shows a schematic diagram of a circuit structure for measuring the DC resistance of a capacitor discharge coil according to an embodiment of the present invention;

FIG. 7 shows a schematic diagram of the circuit structure of the device for measuring the DC resistance of the discharge coil of the capacitor according to the embodiment of the present invention when the device is discharged.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Before describing the method for testing the DC resistance of the capacitor discharge coil involved in the present invention, in order to facilitate understanding, the embodiment of the present invention first provides one of the capacitor discharge coil DC resistance testing equipment among the capacitor discharge coil DC resistance testing equipment. The method for testing the DC resistance of the capacitor discharge coil of the present invention will be described in conjunction with the capacitor discharge coil DC resistance test equipment.

relay control circuit

In the embodiment of the present invention, the relay control circuit includes an input interface group, an output interface group, a test branch, several correction branches and a discharge branch.

Specifically, the input interface group includes a first input interface and a second input interface, and the output interface group includes a first output interface and a second output interface. Since the circuit wiring generally includes a positive pole and a negative pole (which can be understood as a ground pole), the input interface group and the output interface group respectively have two interfaces. In the embodiment of the present invention, the first input interface can be understood as the positive pole The input interface, the first output interface can be understood as a positive output interface; and the second input interface and the second output interface can be understood as a ground wire, correspondingly, the second input interface and the second output interface are directly connected to form a ground wire. In this embodiment, the first input interface, the second input interface, the first output interface, and the second output interface are all connected to devices or modules outside the relay control circuit. For the entire circuit in which the relay control circuit actually works , by connecting different branches between the first input interface and the first output interface or between the second input interface and the second output interface, different circuit effects can be achieved. The actual running circuit between the input interface group and the output interface group is the main circuit of the relay control circuit.

Specifically, in this embodiment of the present invention, any correction branch among the several correction branches and the test branch are connected in parallel between the first input interface and the first output interface, that is, in the A plurality of parallel branches are arranged between the first input interface and the first output interface, and the plurality of parallel branches include several correction branches and one test branch.

Specifically, the test branch includes a test switch.

Specifically, any one of the several correction branches includes a correction switch and a correction resistor arranged in series, and the resistance values of the correction resistors of different correction branches of the several correction branches are different.

The calibration switches in the several calibration branches and the test switches in the test branches respectively have a switch control terminal and a switch drive terminal.

Through the above setting form, when it needs to be applied to a certain branch or combined application of multiple branches, it is only necessary to close the switch on the corresponding branch; since the switch adopts the signal control method, the processor module can pass the corresponding The type of signal controls the switches in each branch respectively. In actual operation, the purpose of changing the circuit loop can be realized without controlling the change of the circuit structure through physical operation, so as to realize various circuit functions and have good operation convenience. .

Specifically, since the DC resistance testing device of the capacitor discharge coil of the embodiment of the present invention needs to be used for the actual measurement of the high-voltage parallel capacitor device, in order to ensure the safety of use, the relay control circuit of the embodiment of the present invention further includes a discharge branch; the discharge Both ends of the branch are respectively connected between the first output interface and the second output interface; the discharge branch includes a discharge switch and a discharge resistor arranged in series; the discharge switch of the discharge branch has a switch control terminal and a switch drive end.

Similar to the correction branch and the test branch, the discharge switch is controlled by the processor module, and the timing of the discharge branch being connected to the circuit loop can be controlled, the discharge is fast, the operation is convenient, and it has good practicability and safety.

Adjustable working power

Specifically, the adjustable working power supply has a voltage regulation output end and a voltage regulation control end, and the voltage regulation output end is connected to the input interface group; it should be noted that the voltage regulation output end actually has a positive output end Corresponding to a negative output terminal (ground terminal), the positive output terminal and the negative output terminal of the voltage regulating output terminal are respectively connected with the first input interface and the second input interface of the relay control circuit.

The voltage regulation control terminal is mainly for the adjustable working power supply, which can output the corresponding output voltage according to the external voltage regulation signal.

In the embodiment of the present invention, the adjustable DC power supply converts 220V AC mains into DC output, and the voltage output range is 0V-50V.

current sensor

The current sensor has a current signal output terminal and a test terminal. The test terminal is used to obtain the current value of the target circuit, and the current signal output terminal is used to output the obtained current value of the target circuit; specifically, the current value of the target circuit is output to the processor module in the form of a voltage signal , the processor module converts the voltage signal into a current value according to its built-in data correspondence corresponding to a specific current sensor.

For ease of operation, the current sensor in the embodiment of the present invention selects an open-type Hall current sensor, the model is HKCT100-5, and the diameter is 40 mm. In the specific implementation, the current sensor only needs to be clamped on the loop of the target circuit, the operation is convenient, and the utility model has good practicability.

power supply circuit

FIG. 2 shows a schematic structural diagram of a power supply circuit according to an embodiment of the present invention. The power supply circuit has a power supply input end and a power supply output end, and the power supply output ends are respectively connected with components or circuits that need power supply. In specific use, the DC resistance testing device of the capacitor discharge coil of the embodiment of the present invention is generally directly connected to the commercial power for operation. Therefore, the power supply input terminal is used to connect to the commercial power, and the power supply circuit converts the commercial power into a specific voltage for output. Specifically, according to the selected component model, the specific required power supply circuit structure will also be changed accordingly. For various common component models in the prior art, optionally, the power supply circuit includes a direct connection circuit, a first conversion circuit and a second conversion circuit; the number of the power supply output terminals is multiple.

It should be noted that the power supply circuit in the embodiment of the present invention is directly powered by commercial power (220V alternating current). Therefore, the following content about voltage conversion is mainly implemented for commercial power.

Direct connection circuit: the input end of the direct connection circuit is connected to the power supply input end, the voltage of the output end of the direct connection circuit is the same as the voltage of the input end of the direct connection circuit, and the output end of the direct connection circuit is the same as the voltage of the input end of the direct connection circuit. One of the plurality of power supply output terminals is electrically connected; the function of the direct connection circuit is to directly output commercial power. In the embodiment of the present invention, the direct connection circuit can be used for power supply of the adjustable working power supply.

The first conversion circuit: the input terminal of the first conversion circuit is connected to the power supply input terminal, the output terminal voltage of the first conversion circuit is DC 12V, and the output terminal of the first conversion circuit is connected to a plurality of the One of the power supply output terminals is electrically connected; specifically, the implementation structure of the first conversion circuit can refer to the schematic structural diagram of the first conversion circuit shown in FIG. 2 of the accompanying drawings, wherein J1 is a 220 AC input interface, That is, the power supply input terminal; F1 is the insurance; C1 is the safety capacitor, which is used to protect the human body, so that the human body will not be affected by the motor after the power is cut off and contacting the circuit; R1 is the varistor, which will clamp after overvoltage voltage, so that the circuit voltage will not exceed the allowable threshold value of the varistor; T1 is a transformer, which is used to step down the 220V AC to the required 12V voltage; D1 to D4 are diodes of type IN4007, used to form a rectifier bridge, so that The AC 12V voltage is converted into a DC 12V voltage; C2 and C3 are filter capacitors and voltage regulator capacitors respectively. Through the setting of the first conversion circuit, the power supply circuit can output 12V DC voltage. In the embodiment of the present invention, the first conversion circuit may be used to supply power to the switch drive terminals of various control switches in the relay control circuit.

Second conversion circuit: the input terminal of the second conversion circuit is connected to the power supply input terminal, the output terminal voltage of the second conversion circuit is DC 5V, and the output terminal of the second conversion circuit is connected to a plurality of the One of the power supply output ends is electrically connected. In a specific implementation, the structure of the second conversion circuit may be similar to that of the first conversion circuit, and it is only necessary to replace the transformer model. In this embodiment of the present invention, the second conversion circuit may be used to supply power to the processor module.

In specific implementation, the first conversion circuit and the second conversion circuit are mainly used for power supply of peripheral devices and processor modules, and may be used according to actual conditions in specific implementation.

In the structure shown in FIG. 1 of the accompanying drawings, since the specific power supply situation of the power supply circuit needs to be confirmed according to the actual setting form, therefore, FIG. The power supply of the device or circuit needs to be adapted according to the actual implementation.

peripheral equipment

Specifically, since the embodiments of the present invention involve different job contents required by the processor module in different steps, in order to facilitate the control of the processor module, it is generally necessary to add a display device for displaying the contents of the processor module and for processing A control device that is controlled by the controller module.

Specifically, the control device may be a controller, and the plurality of peripheral devices include a controller; the processor module has a control receiving end connected to the controller. In specific implementation, the controller may select peripheral input devices such as buttons, knobs, keyboards, and mice.

Specifically, the plurality of peripheral devices include a display screen; the processor module has a display output terminal, and the display output terminal is connected to the display screen.

processor module

The processor module has a voltage regulation output end, a current signal receiving end, a test switch end, several calibration switch ends and a discharge switch end; the voltage regulation output end is connected to the voltage regulation control end, and the current signal receiving end The terminal is connected to the current signal output terminal; the test switch terminal is connected to the control terminal of the test switch, and the several correction switch terminals are respectively connected to the control terminals of the correction switches of the several correction branches; The discharge switch terminal is connected to the control terminal of the discharge switch.

Specifically, the processor module plays the roles of data reception, circuit control, and signal output.

Figure 3 shows a schematic diagram of the processor structure of the STM32F103xx. In specific implementation, the processor module can be based on STM32F103xx series processors. STM32F103xx uses a high-performance ARM Cortex-M3 32-bit RISC core; specifically, the processor includes ADC (Analog-to-Digital Converter, analog-to-digital converter), general-purpose 16-bit timer and PWM timer and communication interface; Generally, the communication interface includes an I2C interface, an SPI interface, a USART interface, a USB interface and a CAN interface (the above-mentioned communication interfaces are all interfaces of a specific protocol).

Specifically, the ADC interface can be used to connect with the current sensor to obtain the analog signal fed back by the current sensor; the GPIO interface (general-purpose input output interface) can be used to connect with the switch control terminal of the switch of each branch to control the access of each branch to the overall loop; the SPI interface can be used to connect with the voltage regulation control terminal of the adjustable working power supply to realize the control of the output voltage of the adjustable working power supply by the processor module; Interfaces such as an interface, a USART interface, a USB interface, and a CAN interface are connected, and the embodiments of the present invention will not be described one by one.

In the specific implementation, since the relay control circuit has built-in correction branch, test branch and discharge branch, the control of the access of different branches to the circuit loop can be realized through the signal control of the processor module, so that the present invention can be quickly realized The method for testing the DC resistance of the capacitor discharge coil of the embodiment is convenient in practical application and has good practicability.

Correspondingly, an embodiment of the present invention provides a method for testing the DC resistance of a capacitor discharge coil, which will be described below with reference to the device for testing the DC resistance of a capacitor discharge coil provided by the embodiment of the present invention.

Test method for DC resistance of capacitor discharge coil

FIG. 4 shows a schematic flowchart of a method for testing the DC resistance of a capacitor discharge coil according to an embodiment of the present invention. The method for testing the DC resistance of a capacitor discharge coil according to an embodiment of the present invention includes:

S101: Calibrate the current sensor and obtain the data sheet of the current sensor:

The current sensor transmits its data through an analog signal (voltage signal) during operation. After receiving the analog signal, the processor module converts it into a digital signal and converts it according to the preset correspondence (correspondence between the voltage signal and the current value). It is converted into a current value; since each current sensor has individual differences, the preset corresponding relationship provided by the manufacturer is not completely accurate. Therefore, the current sensor needs to be calibrated.

Specifically, the purpose of calibrating the current sensor is to find out the corresponding calibration current according to the calibration voltage of the current sensor. This step may not be required if the current sensor has been calibrated for a short period of time before use.

It should be noted that, in the specific implementation, to complete the calibration of the current sensor, a large amount of data needs to be tested, and the embodiment of the present invention only needs to obtain several (a small amount) of accurate data corresponding to the specific application scenarios required. , that is, to obtain several (a small amount) of correction voltages and their corresponding correction currents.

Specifically, the data table generating method includes:

S201: Correction wiring steps:

In the embodiment of the present invention, in step S101, it is first necessary to wire the capacitor discharge coil DC resistance testing device. Specifically, the first output interface and the second output interface of the output interface group of the relay control circuit are short-circuited to form a closed calibration main loop, and the current sensor is clamped on the calibration main loop; the current sensor is used to obtain all Correct the current of the main circuit as described above. After wiring, the specific schematic diagram of the circuit can refer to the schematic structural diagram of the correction circuit shown in FIG. 5 .

S202: Correction control steps:

The processor module controls the correction switches on the i-th correction branch of the n-way correction branches of the relay control circuit to be closed, and the correction switches on the remaining correction branches in the n-way correction branches are kept open, and the i-th correction branch is kept open. The ith correction branch is connected to the correction main circuit, and the i-th correction branch includes a correction resistor R _pi and a corresponding correction switch; specifically, the acquisition circuit of each group of correction data can be simplified as shown in FIG. 5 . the circuit structure shown.

It should be noted that the calibration resistance R _pi is known; in the embodiment of the present invention, the number of calibration branches connected to the calibration main circuit is one each time, therefore, the resistance value on the calibration main circuit is equal to the connection Correct the resistance value of the correction resistor on the correction branch of the main circuit. Specifically, the resistance values of the correction resistors between each group of correction branches are different. In the embodiment of the present invention, considering the resistance value of the actual discharge coil, the resistance value range of the correction resistor may be 1kΩ-5kΩ.

Specifically, the number of correction branches is represented by n, i=1, 2, ···, n. In the embodiment of the present invention, n=5, i=1, 2, 3, 4, and 5.

Specifically, the processor module enables the adjustable working power supply to output an adjustable power supply voltage U _s to the input interface group of the relay control circuit; in the embodiment of the present invention, U _s =48V. It should be noted that the adjustable power supply voltage U _s is only used for the output voltage of the adjustable working power supply, and U _s is not a constant value, and can be adjusted according to requirements in the specific implementation.

In the embodiment of the present invention, the resistance values of the calibration resistors of each set of calibration branches are R _p1 =1kΩ, R _p2 =2kΩ, R _p3 =3kΩ, R _p4 =4kΩ, R _p5 =5kΩ.

S203: Correction data acquisition steps:

所述可调电源电压

为所述继电器控制电路的输入接口组的输入电压，所述校正电阻R_pi两端电压为

The processor module controls the adjustable power supply voltage of the adjustable working power supply output DC

The adjustable supply voltage

is the input voltage of the input interface group of the relay control circuit, and the voltage across the correction resistor R _pi is

S204: Correction calculation steps:

得到第i组校正数据{U_pi,I_pi,R_pi}。The processor module calculates the correction current of the i-th correction branch

Obtain the i-th set of correction data {U _pi , I _pi , R _pi }.

The calibration wiring step, the calibration control step, the calibration data acquisition step, and the calibration calculation step are repeatedly performed to obtain n sets of calibration data.

(本发明实施例以48V为例)至继电器控制电路的输入接口组，然后处理器模块同步接收基于所述电流传感器发送的对应于所述第i路校正支路的放电线圈两端的校正电压U_pi；然后，处理器模块计算第i路校正支路的校正电流

通过以上实施方式，可得到若干组(本发明实施例为五组)精确的校正电压U_pi和校正电流I_pi的对应关系，从而处理器模块可以通过电流传感器所反馈的校正电压U_pi找到精确的对应校正电流I_pi。In S101, when starting the calibration, the processor module first closes the calibration switch of the i-th calibration branch, so that the i-th calibration branch is connected to the main circuit; then the processor module drives the adjustable working power supply to output the adjustable power supply voltage

(The embodiment of the present invention takes 48V as an example) to the input interface group of the relay control circuit, and then the processor module synchronously receives the correction voltage U corresponding to the two ends of the discharge coil of the i-th correction branch sent based on the current sensor. _pi ; then, the processor module calculates the correction current of the i-th correction branch

Through the above implementation manner, several groups (five groups in the embodiment of the present invention) can be obtained to obtain accurate correspondences between the correction voltage U _pi and the correction current I _pi , so that the processor module can find the accurate correction voltage U _pi through the feedback of the current sensor. The corresponding correction current I _pi .

Specifically, the data measured in the embodiment of the present invention are shown in the following table:

In a specific implementation, all the correction data are aggregated to form a data table, the data table includes n groups of correction data {U _pi , I _pi , R _pi }, i=1, 2,...,n, where U _pi is the i-th Correction voltage of the group of correction data, I _pi is the correction current of the i-th group of correction data, R _pi is the correction resistance value of the i-th group of correction data, where i=1,2,...,n.

Through this S101, the correction of several data correspondences in the current sensor can be completed, and a data table can be obtained; the data table can be updated to the processor module synchronously, so that the processor module can accurately obtain the voltage signal fed back by the current sensor according to the current sensor. The current magnitude data that the current sensor actually needs to transmit (correction current I _pi ).

S102: Test wiring steps;

Specifically, after the data table is acquired in step S101, it is necessary to connect the capacitor discharge coil DC resistance test equipment to the working circuit where the discharge coil is located. Correspondingly, it is necessary to perform new wiring for the capacitor discharge coil DC resistance test equipment .

Connect the first output interface and the second output interface of the output interface group of the relay control circuit to the two ends of the discharge coil respectively, and clamp the current sensor on the branch where the measured discharge coil is located; specifically, Figure 6 shows A schematic diagram of the circuit structure for measuring the DC resistance of the capacitor discharge coil according to the embodiment of the present invention is shown. The working circuit where the discharge coil is located mainly includes a capacitor device (represented by a capacitor symbol in FIG. 6 ) and a corresponding discharge coil, and the discharge coil is connected in parallel with the capacitor device.

S103: test control step;

The processor module controls the test switch on the test branch of the relay control circuit to close to form a test main circuit, and the test branch includes the test switch;

After the step S103 , a schematic diagram of the circuit structure of the device for testing the DC resistance of the capacitor discharge coil according to the embodiment of the present invention is shown in FIG. 6 .

S104: Steps for acquiring target data:

Specifically, the acquisition of the target data in the embodiment of the present invention has two modes, namely the precise mode and the fast mode.

Specifically, in the precise mode, the processor module controls the adjustable working power supply to output a DC adjustable power supply voltage U _S , the adjustable power supply voltage U _S is the input voltage of the input interface group of the relay control circuit, the The output voltage of the output interface group of the relay control circuit is the same as _US ; in the embodiment of the present invention, the boost stop condition is that the adjustable power supply voltage US reaches the upper limit of the output voltage of _50V or the upper limit of the output current of 100mA. When the boost stop condition is reached, the adjustable supply voltage US can be _obtained .

The current sensor converts the current I _f of the branch where the discharge coil is located into a real-time feedback voltage U _f and sends it back to the processor module;

The processor module adjusts the adjustable power supply voltage U _S according to the real-time feedback voltage U _f until the real-time feedback voltage U _f is equal to the correction voltage U _pk of the kth group of correction data in the data table; at this time, the The adjustable power supply voltage U _S is the target voltage U _S0 , the real-time feedback voltage U _f is the target feedback voltage U _f0 , and in the kth group of correction data, the correction current I _pk corresponding to the correction voltage U _pk is target current I _f0 ;

The processor module obtains a set of target data, and the target data is {U _S0 , U _f0 , I _f0 }.

Specifically, in the fast mode, a calibration function curve f(I _p ', U _p ') is used to fit I _pi and U _pi in the n sets of calibration data based on the least squares method, and I _p ' is the fitting current , U _p ' is the fitting feedback voltage;

The processor module controls the adjustable working power supply to output a DC adjustable power supply voltage _US ', the adjustable power supply voltage _US ' is the input voltage of the input interface group of the relay control circuit, and the output interface of the relay control circuit The output voltage of the group is both U _S '; the adjustable power supply voltage U _S ' is the target voltage U _S0 ;

The current sensor converts the current I _f of the branch where the discharge coil is located into a real-time feedback voltage U _f and sends it back to the processor module, where the real-time feedback voltage U _f is the target feedback voltage U _f0 ;

Substitute the target feedback voltage U _f0 into the correction function curve f(I _p ', U _p ') as the fitting feedback voltage U _p ' to obtain the corresponding fitting current, and the corresponding fitting The current is the target current I _f0 ;

The processor module obtains a set of target data, and the target data is {U _So , U _fo , I _fo }.

In step S104, the ultimate purpose is to obtain a set of target data {U _So , U _fo , I _fo }.

S105: calculation step;

Specifically, the processor module calculates the DC resistance of the discharge coil

S106: discharge step;

After step S105 is completed, the capacitor needs to be fully discharged.

The discharging step includes:

S301: Discharge control steps:

The processor module controls the discharge switch on the discharge branch of the relay control circuit to close, and simultaneously opens the test switch on the test branch to form a discharge main circuit. The discharge branch includes a discharge switch and a discharge resistor. The residual charge on the capacitor can be discharged through the discharge main circuit. In the embodiment of the present invention, the discharge starting condition is that the adjustable power supply voltage US drops to _0V .

Specifically, the schematic diagram of the discharge circuit structure of the capacitor discharge coil DC resistance test equipment is shown in FIG. 7 .

To sum up, the embodiments of the present utility model provide a relay control circuit, in which a test branch, a test branch and a correction branch are integrated, and the branch in the relay control circuit can be controlled externally, which can be more convenient. It realizes the calibration of the current sensor, the measurement of the DC resistance of the capacitor discharge coil and the discharge function of the high-voltage parallel capacitor device, which has good operation convenience; the DC resistance test equipment of the capacitor discharge coil is connected to the different branches of the relay control circuit through the processor module. Control and different wiring methods can realize the correction of the current sensor, the measurement of the DC resistance of the capacitor discharge coil and the discharge function of the high-voltage parallel capacitor device, with good operational convenience.

The relay control circuit and the DC resistance testing equipment of the capacitor discharge coil provided by the embodiments of the present utility model have been introduced in detail above. The principles and implementations of the present utility model are described with specific examples in this paper. The descriptions of the above embodiments are only It is used to help understand the method of the present utility model and its core idea; meanwhile, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and the scope of application. In summary, the above , the content of this specification should not be construed as a limitation to the present invention.

Claims (9)

1. The relay control circuit is characterized by comprising an input interface group, an output interface group, a test branch and a plurality of correction branches; the input interface group comprises a first input interface and a second input interface, and the output interface group comprises a first output interface and a second output interface;

any one of the plurality of correction branches and the test branch are connected between the first input interface and the first output interface in parallel, and the second input interface and the second output interface are directly connected;

the test branch comprises a test switch; any one of the plurality of correction branches comprises a correction switch and a correction resistor which are arranged in series, and the resistance values of the correction resistors of different correction branches in the plurality of correction branches are different;

the correcting switches in the correcting branches and the testing switches in the testing branches are respectively provided with a switch control end.

2. The relay control circuit of claim 1, further comprising a discharge branch;

two ends of the discharging branch circuit are respectively connected between the first input interface and the second input interface, or two ends of the discharging branch circuit are respectively connected between the second input interface and the second output interface;

the discharge branch circuit comprises a discharge switch and a discharge resistor which are arranged in series;

the discharge switch of the discharge branch circuit is provided with a switch control end.

3. A capacitor discharge coil dc resistance test apparatus comprising an adjustable operating power supply, a current sensor, a processor module and a relay control circuit according to claim 1 or 2;

the adjustable working power supply is provided with a voltage-regulating output end and a voltage-regulating control end, and the voltage-regulating output end is connected with the input interface group;

the current sensor is provided with a current signal output end and a test end;

the processor module is provided with a voltage regulating output end, a current signal receiving end, a test switch end and a plurality of correction switch ends; the voltage regulating output end is connected with the voltage regulating control end, and the current signal receiving end is connected with the current signal output end;

the test switch end is connected with the control end of the test switch, and the plurality of correction switch ends are respectively connected with the control ends of the correction switches of the plurality of correction branches.

4. The capacitor discharge coil direct current resistance test apparatus as set forth in claim 3, further comprising a power supply circuit.

5. The capacitor discharge coil dc resistance test apparatus of claim 3, wherein the output voltage of the adjustable operating power supply ranges from 0V to 50V.

6. The capacitor discharge coil direct current resistance test apparatus of claim 3, wherein the current sensor is a Hall current sensor.

7. The capacitor discharge coil direct current resistance test device of claim 3, further comprising a number of peripheral devices for display and/or control.

8. The capacitor discharge coil direct current resistance test apparatus of claim 7, wherein the number of peripheral devices includes a display screen;

the processor module is provided with a display output end, and the display output end is connected with the display screen.

9. The capacitor discharge coil direct current resistance test apparatus of claim 7, wherein the number of peripheral devices includes a controller;

the processor module is provided with a control receiving end which is connected with the controller.

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