CN222087824U - A ground fault detection circuit and frequency converter - Google Patents
A ground fault detection circuit and frequency converter Download PDFInfo
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Abstract
本实用新型涉及接地故障检测技术领域，公开了一种可靠性较高的接地故障检测电路及变频器，接地故障检测电路包括信号检测模块(101)、反相求和模块(102)、电压比较模块(103)、开关模块(104)、钳位模块(105)及主控模块(106)，其中，当电压比较模块(103)输出的控制电平信号为高电平时，开关模块(104)截止，钳位模块(105)输出为高电平，主控模块(106)根据输入的高电平判断无接地故障发生；当电压比较模块(103)输出的控制电平信号为低电平时，开关模块(104)被控导通，钳位模块(105)输出为低电平，主控模块(106)根据输入的低电平判断接地故障发生，并输出控制主回路关断的控制信号。
The utility model relates to the technical field of ground fault detection, and discloses a ground fault detection circuit and a frequency converter with high reliability. The ground fault detection circuit comprises a signal detection module (101), an anti-phase summing module (102), a voltage comparison module (103), a switch module (104), a clamping module (105) and a main control module (106), wherein when the control level signal output by the voltage comparison module (103) is at a high level, the switch module (104) is turned off, the clamping module (105) outputs a high level, and the main control module (106) determines that no ground fault occurs according to the input high level; when the control level signal output by the voltage comparison module (103) is at a low level, the switch module (104) is controlled to be turned on, the clamping module (105) outputs a low level, and the main control module (106) determines that a ground fault occurs according to the input low level, and outputs a control signal for controlling the main circuit to be shut down.
Description
Technical Field
The utility model relates to the technical field of ground fault detection, in particular to a ground fault detection circuit and a frequency converter.
Background
Inverter control/drive motors are more common devices in the industry. With the operation of the motor in the service time, the motor may have insulation degradation and cable breakage, so as to cause the motor to have a grounding fault (such as poor grounding or disconnection). When the control system cannot timely feed back the current ground fault, the normal operation of the motor can be affected, and the personal safety of operators can be possibly endangered.
Therefore, how to improve the accuracy and reliability of the grounding detection is a technical problem that needs to be solved by those skilled in the art.
Disclosure of utility model
The utility model aims to solve the technical problem that when the control system cannot timely feed back the current ground fault in the prior art, the normal operation of a motor is affected, and the personal safety of operators is possibly endangered, and provides a ground fault detection circuit with higher reliability.
The technical scheme adopted by the utility model for solving the technical problems is that a ground fault detection circuit is constructed and provided with:
The signal detection module is configured in the detection circuit and is used for acquiring a current signal input by a power supply side;
the input end of the inverting summation module is coupled with the output end of the signal detection module and is used for receiving the current signal;
A voltage comparison module provided with a preset value,
The input end of the voltage comparison module is connected with the output end of the inverting summation module and is used for receiving the current signal, comparing the input current signal with the preset value and outputting a control level signal according to the comparison result;
the input end of the switch module is connected with the output end of the voltage comparison module and is used for receiving the control level signal;
the input end of the clamping module is connected with the output end of the switch module;
The input end of the main control module is connected with the output end of the clamping module;
when the control level signal output by the voltage comparison module is at a high level, the switch module is turned off, the clamp module outputs the control level signal at the high level, and the main control module judges that no ground fault occurs according to the input high level;
When the control level signal output by the voltage comparison module is low level, the switch module is controlled to be turned on, the clamp module outputs low level, the main control module judges that the ground fault occurs according to the input low level, and outputs a control signal for controlling the main loop to be turned off.
In some embodiments, the signal detection module includes a first resistor, a second resistor, and a third resistor connected in parallel,
One end of the first resistor is connected with the output end of the first phase line and is used for receiving a first current signal,
One end of the second resistor is connected with the output end of the second phase line and is used for receiving a second current signal,
One end of the third resistor is connected with the output end of the third phase line and is used for receiving a third current signal,
The other ends of the first resistor, the second resistor and the third resistor are respectively connected with the input end of the inverting summation module and used for receiving the current signals.
In some embodiments, the inverting summing module includes at least an amplifier,
The inverting terminal of the amplifier is connected with one end of the first resistor, the second resistor and the third resistor for receiving the current signal,
The in-phase end of the amplifier is connected with the common end,
The output end of the amplifier is connected with the input end of the voltage comparison module,
When the 3-phase currents acquired by the first resistor, the second resistor and the third resistor are balanced, the voltage of the inverting terminal of the amplifier is 0V, and the output of the amplifier is 0V.
In some implementations, the voltage comparison module includes at least a first comparator and a second comparator,
The non-inverting terminal of the first comparator and the inverting terminal of the second comparator are connected with the output terminal of the amplifier for receiving the current signal,
The inverting terminal of the first comparator and the non-inverting terminal of the second comparator are connected with a 15V power supply terminal,
The output ends of the first comparator and the second comparator are coupled with the input end of the switch module,
When the input current signal is in the range of the preset value, the output of the first comparator and the second comparator is high level,
When the input current signal is larger or smaller than the preset value, the output of the first comparator and the second comparator is low level.
In some embodiments, the switch module includes at least a transistor and a third diode,
The base electrode of the triode is connected with the output end of the first comparator and the second comparator,
The emitter of the triode is connected with the anode of the third diode and the 15V power supply end,
The collector of the triode is connected with the common terminal,
The cathode of the third diode is coupled to the input end of the clamping module.
In some embodiments, the clamping module includes a fourth diode and a fifth diode connected in series,
The anode of the fourth diode and the cathode of the fifth diode are respectively connected with the cathode of the third diode and the input end of the main control module,
The cathode of the fourth diode is connected with a 6V power end,
And the cathode of the fifth diode is connected with the common terminal.
In some embodiments, the transistor is selected to be a PNP transistor.
In a second aspect, a frequency converter includes the above ground fault detection circuit.
The ground fault detection circuit comprises a signal detection module, an inverting summation module, a voltage comparison module, a switch module, a clamping module and a main control module, wherein the signal detection module is used for acquiring a current signal input by a power supply side, when a control level signal output by the voltage comparison module is high level, the switch module is turned off, the clamping module outputs high level, the main control module judges that no ground fault occurs according to the input high level, when the control level signal output by the voltage comparison module is low level, the switch module is controlled to be turned on, the clamping module outputs low level, and the main control module judges that the ground fault occurs according to the input low level and outputs a control signal for controlling the turn-off of a main circuit. Compared with the prior art, the main control module judges whether the load has a ground fault according to the input level signal so as to improve the safety and reliability of the frequency converter and the load operation, and the problems that when the control system cannot timely feed back the current ground fault, the normal operation of the motor is affected and the personal safety of operators is possibly endangered can be effectively solved.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
Fig. 1 is a schematic circuit diagram of an embodiment of a ground fault detection circuit provided by the present utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of the ground fault detection circuit 100 of the present utility model, the ground fault detection circuit 100 includes a signal detection module 101, an inverse summation module 102, a voltage comparison module 103, a switch module 104, a clamp module 105 and a main control module 106,
The signal detection module 101 is used for acquiring a current/voltage signal input by an alternating current power supply side;
the inverting summing module 102 has a signal amplifying function, and is configured to receive the current/voltage signal input by the signal detecting module 101 and output a high level or a low level according to the state of the input current/voltage signal;
The voltage comparison module 103 is used for comparing the input current/voltage signal with a preset value and outputting a control level signal according to the comparison result of the input current/voltage signal and the preset value;
The switch module 104 is used for controlling the output direction of the +15V voltage signal;
The clamping module 105 is used for clamping a level signal input into the main control module 106;
The main control module 106 is configured to receive the level signal output by the clamp module 105, and determine whether a ground fault exists according to the input level signal.
Specifically, the signal detection module 101 is configured in a detection circuit, and is configured to acquire a current/voltage signal input from the 3-phase power supply side, and output the current/voltage signal to the inverse summation module 102;
The input end of the inverting summing module 102 is coupled to the output end of the signal detecting module 101, and is configured to receive the current/voltage signal and output a level signal according to the voltage state of the input current/voltage signal;
For example, when the output 3-phase current is balanced, the voltage forming a "neutral point" in the signal detection module 101 is close to 0V, the input end of the inverting summing module 102 is also close to 0V, and the output end thereof is also close to 0V (or is at a low level);
When the 3-phase current imbalance rises to a certain extent due to single-phase grounding faults (or other reasons) of the load motor windings, the signal voltage difference appears in the summation of the UI, the VI and the WI, and when the input voltage value of the input end of the inverting summation module 102 is higher than a certain voltage (such as 0.9V) or lower than a certain voltage (such as-1.05V), the output is high level;
further, a voltage comparison module 103, which is provided with a preset value (0.9V or-1.05V),
The input end of the voltage comparison module 103 is connected with the output end of the inverse summation module 102, and is used for receiving current/voltage signals, comparing the input current signals with preset values, and outputting control level signals according to comparison results;
one input end of the switch module 104 is connected with the output end of the voltage comparison module 103 and is used for receiving a control level signal, the other input end of the switch module 104 is connected with a 15V power supply end,
When the input control level signal is at a high level, the switch module 104 is controlled to be turned off, and a +15v voltage signal is output to the clamp module 105;
When the input control level signal is at a low level, the switch module 104 is controlled to be turned on, and a +15V voltage signal flows to the common terminal;
The input end of the clamping module 105 is respectively connected with the output end of the switch module 104 and the 15V power supply end;
further, an input end of the main control module 106 is connected with an output end of the clamping module 105;
When the control level signal output by the voltage comparison module 103 is at a high level, the switch module 104 is turned off, the +15v voltage signal is processed by the clamp module 105 and then is output at a high level (about 5.6V), and the main control module 106 judges that no ground fault occurs according to the input high level (about 5.6V);
When the control level signal output by the voltage comparison module 103 is at a low level, the switch module 104 is controlled to be turned on, the +15v voltage signal flows to the common terminal, the clamp module 105 outputs at a low level (about 0V), the main control module 106 determines that a ground fault occurs according to the input low level (about 0V), and outputs a control signal for controlling the main circuit (such as a control circuit or a driving circuit of the IGBT bridge arm) to be turned off, so as to control the load to stop running.
By using the technical scheme, the main control module 106 judges whether the load has a ground fault according to the input level signal, and when the ground fault occurs, the main control module outputs a control signal for controlling the main loop to be turned off so as to improve the safety and reliability of the operation of the frequency converter and the load, and the problems that when the control system cannot timely feed back the current ground fault, the normal operation of the motor is affected and the personal safety of an operator is possibly endangered can be effectively solved.
In some embodiments, the signal detection module 101 includes a first resistor R101, a second resistor R102, and a third resistor R103 connected in parallel, where the resistance of the resistors is selected to be 7.5K;
Specifically, one end of the first resistor R101 is connected to an output end of the first phase line (U-phase) for receiving the first current signal,
One end of the second resistor R102 is connected to the output end of the second phase line (V-phase), for receiving the second current signal,
One end of the third resistor R103 is connected to the output end of the third phase line (W-phase) for receiving the third current signal,
The other ends of the first resistor R101, the second resistor R102 and the third resistor R103 are respectively connected with the input end of the inverting summing module 102, and are used for receiving current/voltage signals.
In some embodiments, the inverting summing module 102 includes at least an amplifier U1A that has the effect of signal amplification.
Specifically, the inverting terminal (corresponding to 3 pins) of the amplifier U1A is connected to one terminal of the first resistor R101, the second resistor R102 and the third resistor R103, for receiving the current/voltage signal,
The non-inverting terminal (corresponding to pin 2) of the amplifier U1A is connected to the common terminal,
The output of the amplifier U1A (corresponding to 4 pins) is connected to the input of the voltage comparison module 103,
When the 3-phase currents obtained by the first resistor R101, the second resistor R102, and the third resistor R103 are balanced, the voltage at the inverting terminal of the amplifier U1A is 0V, and the output of the amplifier U1A is 0V.
Specifically, when the output 3-phase current is balanced, the voltage at the "neutral point" formed by the first resistor R101, the second resistor R102, and the third resistor R103 is close to 0V, and therefore, the voltage at the inverting terminal (corresponding to 3 pins) of the amplifier U1A is also close to 0V, and the output is also 0V;
When the 3-phase current imbalance rises to a certain extent due to single-phase ground faults (or other reasons) of the load motor winding, U, V, W add up to generate a signal voltage difference, and at this time, the input voltage value of the 4 pins of the amplifier U1A is higher than 0.9V or lower than-1.05V.
In some embodiments, the voltage comparison module 103 includes at least a first comparator U2A and a second comparator U2B, wherein the first comparator U2A and the second comparator U2B constitute a voltage window comparator.
Specifically, the non-inverting terminal (corresponding to 3 pins) of the first comparator U2A and the inverting terminal (corresponding to 6 pins) of the second comparator U2B are connected with the output terminal (corresponding to 4 pins) of the amplifier U1A, for receiving the current signal, for receiving the current/voltage signal,
Wherein the inverting terminal (corresponding to 2 pins) of the first comparator U2A is connected with the +15V power supply terminal through a fifth resistor R105 and a sixth resistor R106 which are connected in series, wherein the resistance value of the fifth resistor R105 is 8.2K, the resistance value of the sixth resistor R106 is 10K, the +15V voltage is about-1.05V after being divided by the fifth resistor R105 and the sixth resistor R106,
The non-inverting terminal (corresponding to 5 pins) of the second comparator U2B is connected with the +15V power supply terminal through an eighth resistor R108 and a ninth resistor R109 which are connected in series, wherein the resistance value of the eighth resistor R108 is selected to be 2.7K, the resistance value of the ninth resistor R109 is selected to be 1.8K, the +15V voltage is approximately 0.9V after being divided by the eighth resistor R108 and the ninth resistor R109,
It can be seen that the preset value or window voltage of the voltage comparison module 103 is about 0.9V-1.05V;
the output terminal (corresponding to pin 1) of the first comparator U2A and the output terminal (corresponding to pin 7) of the second comparator U2B are respectively connected with the input terminal of the switch module 104,
When the input current/voltage signal is within the preset value range (0.9V-1.05V), the first comparator U2A and the second comparator U2B output high levels, and the switch module 104 is controlled to be turned off;
When the input current/voltage signal is greater than or less than the preset value (0.9V-1.05V), the first comparator U2A and the second comparator U2B output low levels, and the switch module 104 is controlled to be turned on.
In some embodiments, the switch module 104 includes at least a transistor Q101 and a third diode D103, wherein the transistor Q101 has a switching function, and is selected as a PNP transistor.
Specifically, the base of the transistor Q101 is connected to the output terminal (corresponding to pin 1) of the first comparator U2A and the output terminal (corresponding to pin 7) of the second comparator U2B through an eleventh resistor R111,
The emitter of the triode Q101 is connected with the anode of the third diode D103 and the +15V power supply end,
Wherein the +15V power supply terminal applies +15V voltage to the emitter of the triode Q101 and the anode of the third diode D103 through a thirteenth resistor R113,
The collector of transistor Q101 is connected to a common terminal,
The cathode of the third diode D103 is coupled to the input terminal of the clamping module 105.
When the triode Q101 is controlled to be conducted, +15V voltage is connected to a common end through a thirteenth resistor R113 and an emitter-collector of the triode Q101;
when the transistor Q101 is turned off, the +15v voltage is output to the clamping module 105 through the thirteenth resistor R113 and the third diode D103.
In some embodiments, the clamping module 105 includes a fourth diode D104 and a fifth diode D106 connected in series, wherein an anode of the fourth diode D104 and a cathode of the fifth diode D106 are respectively connected with a cathode of the third diode D103 and an input terminal (corresponding to pin 70) of the master control MCU (belonging to the master control module 106),
The cathode of the fourth diode D104 is connected to the +6v power supply terminal, and the cathode of the fifth diode D106 is connected to the common terminal.
The +15v voltage is input through the thirteenth resistor R113 and the third diode D103, and after being clamped by the fourth diode D104 and the fifth diode D106, the voltage is output at about 5.6V, and the master controller MCU determines that no ground short circuit fault occurs according to the input voltage (or high level) of 5.6V.
The working principle is as follows:
The U, V, W current detection signal led in by the first resistor R101, the second resistor R102 and the third resistor R103 is input into the 3 pin of the amplifier U1A, when the 3-phase current is output and balanced, the voltage of a neutral point formed by the first resistor R101, the second resistor R102 and the third resistor R103 is close to 0V, the 7 pin of the amplifier U1A is close to 0V, the first comparator U2A and the second comparator U2B of the later stage keep the original output state unchanged (the voltages of the 1 pin and the 7 pin are 15V high level), the base bias current of the triode Q101 is zero and is in a cut-off state, the 70 pin input signal of the master controller MCU is led in by the thirteenth resistor R113 in a current limiting way, after the fourth diode D104 is clamped, a 5.6V high level signal is output, and the MCU judges that no ground short circuit fault is generated, and the frequency converter operates normally;
When the 3-phase current imbalance rises to a certain degree due to single-phase grounding faults (or other reasons) of the load motor windings, when U, V, W is added and a signal voltage difference occurs, the 7-pin input voltage value of the amplifier U1A is higher than 0.9V or lower than-1.05V, the internal amplifying tubes of the 1-pin or 7-pin output ends of the first comparator U2A and the second comparator U2B are conducted, the 15V high level is changed to the 15V low level, the triode Q101 generates base bias current and is saturated and conducted, the emitter level is changed to the 0V low level, the third diode D103 is reversely biased and cut off, the 5.6V high level signal of the 70 pin of the MCU is changed to 0V, the MCU judges that the grounding fault signal is generated, and the frequency converter alarms and stops protecting.
In a second aspect, a frequency converter includes the above ground fault detection circuit 100.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.
Claims (8)
1. A ground fault detection circuit, comprising:
The signal detection module is configured in the detection circuit and is used for acquiring a current signal input by a power supply side;
the input end of the inverting summation module is coupled with the output end of the signal detection module and is used for receiving the current signal;
A voltage comparison module provided with a preset value,
The input end of the voltage comparison module is connected with the output end of the inverting summation module and is used for receiving the current signal, comparing the input current signal with the preset value and outputting a control level signal according to the comparison result;
the input end of the switch module is connected with the output end of the voltage comparison module and is used for receiving the control level signal;
the input end of the clamping module is connected with the output end of the switch module;
The input end of the main control module is connected with the output end of the clamping module;
when the control level signal output by the voltage comparison module is at a high level, the switch module is turned off, the clamp module outputs the control level signal at the high level, and the main control module judges that no ground fault occurs according to the input high level;
When the control level signal output by the voltage comparison module is low level, the switch module is controlled to be turned on, the clamp module outputs low level, the main control module judges that the ground fault occurs according to the input low level, and outputs a control signal for controlling the main loop to be turned off.
2. The ground fault detection circuit of claim 1, wherein,
The signal detection module comprises a first resistor, a second resistor and a third resistor which are connected in parallel,
One end of the first resistor is connected with the output end of the first phase line and is used for receiving a first current signal,
One end of the second resistor is connected with the output end of the second phase line and is used for receiving a second current signal,
One end of the third resistor is connected with the output end of the third phase line and is used for receiving a third current signal,
The other ends of the first resistor, the second resistor and the third resistor are respectively connected with the input end of the inverting summation module and used for receiving the current signals.
3. The ground fault detection circuit of claim 2, wherein,
The inverse summation module comprises at least an amplifier,
The inverting terminal of the amplifier is connected with one end of the first resistor, the second resistor and the third resistor for receiving the current signal,
The in-phase end of the amplifier is connected with the common end,
The output end of the amplifier is connected with the input end of the voltage comparison module,
When the 3-phase currents acquired by the first resistor, the second resistor and the third resistor are balanced, the voltage of the inverting terminal of the amplifier is 0V, and the output of the amplifier is 0V.
4. The ground fault detection circuit of claim 3, wherein,
The voltage comparison module at least comprises a first comparator and a second comparator,
The non-inverting terminal of the first comparator and the inverting terminal of the second comparator are connected with the output terminal of the amplifier for receiving the current signal,
The inverting terminal of the first comparator and the non-inverting terminal of the second comparator are connected with a 15V power supply terminal,
The output ends of the first comparator and the second comparator are coupled with the input end of the switch module,
When the input current signal is in the range of the preset value, the output of the first comparator and the second comparator is high level,
When the input current signal is larger or smaller than the preset value, the output of the first comparator and the second comparator is low level.
5. The ground fault detection circuit of claim 4, wherein,
The switch module at least comprises a triode and a third diode,
The base electrode of the triode is connected with the output end of the first comparator and the second comparator,
The emitter of the triode is connected with the anode of the third diode and the 15V power supply end,
The collector of the triode is connected with the common terminal,
The cathode of the third diode is coupled to the input end of the clamping module.
6. The ground fault detection circuit of claim 5, wherein,
The clamping module comprises a fourth diode and a fifth diode which are connected in series,
The anode of the fourth diode and the cathode of the fifth diode are respectively connected with the cathode of the third diode and the input end of the main control module,
The cathode of the fourth diode is connected with a 6V power end,
And the cathode of the fifth diode is connected with the common terminal.
7. The ground fault detection circuit of claim 6, wherein,
The triode is selected as a PNP triode.
8. A frequency converter comprising the ground fault detection circuit of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202420487632.4U CN222087824U (en) | 2024-03-13 | 2024-03-13 | A ground fault detection circuit and frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420487632.4U CN222087824U (en) | 2024-03-13 | 2024-03-13 | A ground fault detection circuit and frequency converter |
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| CN222087824U true CN222087824U (en) | 2024-11-29 |
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