CN218783719U - Current type control circuit - Google Patents
Current type control circuit Download PDFInfo
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- CN218783719U CN218783719U CN202222799547.5U CN202222799547U CN218783719U CN 218783719 U CN218783719 U CN 218783719U CN 202222799547 U CN202222799547 U CN 202222799547U CN 218783719 U CN218783719 U CN 218783719U
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Abstract
The utility model provides a current type control circuit, which comprises a current transformer module, a window comparator module, a signal isolation module and an integrated monostable circuit module, wherein the current transformer module comprises a measuring current transformer TA1, a precision current transformer TA2 and a sampling resistor R1; the window comparator module comprises an operational amplifier U1A, an operational amplifier U1B, a diode D1, a diode D2 and a pull-down resistor R2; the signal isolation module comprises a photoelectric coupler U2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C1; the integrated monostable circuit module comprises a monostable trigger circuit U3 and a relay K1. The utility model discloses in, increase the collection of bus current return circuit, relay contact output, access controller node provides a criterion or the condition that the conversion started, and control system detects power supply non-pressure, when having no current, starts automatic input, realizes the electric current blocking function, improves the power supply reliability, realizes user's preventive maintenance simultaneously.
Description
Technical Field
The utility model belongs to automatic change over switch's measurement and control system field especially relates to a design of generating line current loop.
Background
The automatic transfer switch collects the voltage of the power supply under the automatic transfer condition, when the monitored voltage state is no voltage, the automatic transfer switch starts the transfer, disconnects the circuit breaker connected with the power supply, closes the circuit breaker connected with the power supply and having the voltage, and the load power supply is interrupted in short time in the process.
The power supply voltage of the main wiring is connected to a control system through a lead and an electrical element, the voltage state monitored by the system is used as a condition for selecting control conversion, if the power supply voltage is normal, and when the voltage of the acquisition loop is not pressurized, the microprocessor can monitor that the power supply state is pressurized, so that the microprocessor is put into a normal power supply, the load power supply is interrupted in the process, and a user may think that the power failure is unnecessary and the power supply is unreliable in special and rare application scenes.
In summary, in the measurement control design of the automatic transfer switch, a bus current loop needs to be designed, bus current loop acquisition is added, relay contact output is connected to a controller node, a criterion or condition for starting transfer is provided, when a control system detects that a power supply is not voltage or current, automatic switching is started, when the power supply is detected to be not voltage or current, a circuit breaker connected with the power supply keeps closed, the transfer is stopped, and the controller indicates a fault and gives an alarm, so that a current locking function is realized.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a control circuit of electric current type to realize the electric current shutting function, improve the power supply reliability, realize user's preventive maintenance simultaneously.
In a first aspect, an embodiment of the present invention provides a current-mode control circuit, which includes a current transformer module, a window comparator module, a signal isolation module, and an integrated monostable circuit module,
the current transformer module, the window comparator module, the signal isolation module and the integrated monostable circuit module are sequentially connected;
the current transformer module comprises a measuring current transformer TA1, a precision current transformer TA2 and a sampling resistor R1, and is used for converting primary current of a bus into secondary current;
the window comparator module comprises an operational amplifier U1A, an operational amplifier U1B, a diode D1, a diode D2 and a pull-down resistor R2, and is used for converting an alternating voltage signal into a pulse signal;
the signal isolation module comprises a photoelectric coupler U2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C1;
the integrated monostable circuit module comprises a monostable trigger circuit U3, a resistor R8, a resistor R9, a capacitor C2, a capacitor C3 and a relay K1, and the integrated monostable circuit module is used for converting a plurality of continuous pulse signals into continuous high signals.
Further, the secondary side of the measuring current transformer TA1 is connected with the primary side of the precision current transformer TA2, the secondary side of the precision current transformer TA2 is connected with two ends of the sampling resistor R1, and the sampling resistor R1 is used for converting secondary current into an alternating voltage signal.
Furthermore, the input end U1A + of the operational amplifier U1A is connected with the input end U1B-of the operational amplifier U1B and is connected with one end of a sampling resistor R1, the other end of the sampling resistor R1 is grounded,
the input end U1A-of the operational amplifier U1A is led from the positive threshold voltage end VREF +,
the output end of the operational amplifier U1A is connected with the anode of the diode D1;
the input end U1B + of the operational amplifier U1B is led from a threshold voltage positive end VREF-, and the output end of the operational amplifier U1B is connected with the anode of a diode D2;
the diode D1 is connected with the cathode of the diode D2 in parallel and is grounded through the pull-down resistor R2.
Further, the input end of the photoelectric coupler U2 is connected to one end of a resistor R3 and one end of a resistor R4, respectively, one end of the output end is connected to a power supply voltage, and the other end is connected to one end of a resistor R5;
the other end of the resistor R3 is connected with the resistor R2, the other end of the resistor R4 is grounded, and the other end of the resistor R5 is respectively connected with A of the monostable trigger circuit U3 A One end of the port, the resistor R6 and one end of the resistor R7 are connected;
the other end of the resistor R7 is respectively connected with B of the monostable trigger circuit U3 B The port is connected with one end of a capacitor C1; the other ends of the resistor R6 and the capacitor C1 are grounded.
Further, a RESETA port of the monostable trigger circuit U3 is connected with a power supply voltage, B A
ˉ
Port and Q A Port connection, Q A Port and A B Connecting ports;
the RESETB port of the monostable trigger circuit U3 is connected with a power supply voltage Q B The port is connected with one end of the relay K1, and the other end of the relay K1 is grounded.
Further, C of the monostable trigger circuit U3 X R X One end of a resistor R9 is connected with one end of a capacitor C3, and the other end of the resistor R is connected with a power supply voltage; c of the monostable trigger circuit U3 X R X One end of a resistor R8 is connected with one end of a capacitor C2, and the other end of the resistor R8 is connected with a power supply voltage; the other ends of the capacitor C2 and the capacitor C3 are grounded.
Furthermore, the type of the measuring current transformer TA1 is AKH-0.66-100III, and the transformation ratio is 5000/5; the model of the precision current transformer TA2 is HCT226JY-2, and the transformation ratio is 5A/2.5mA.
Furthermore, the monostable trigger circuit is a dual-channel monostable trigger circuit, and the type of the monostable trigger circuit is MC14538.
The embodiment of the utility model provides a following beneficial effect has been brought:
1. the circuit breaker is applied to a measurement and control system of an automatic transfer switch, keeps power supply when the circuit breaker is in a closed state, and has a current locking function;
2. the trigger condition delay function is provided, and the signal processing reliability is improved;
3. the current transformer, the integrated circuit and the resistor-capacitor component are designed and applied to realize the quick signal response.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram of a prior art control system provided by an embodiment of the present invention;
fig. 2 is a schematic circuit diagram provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
To facilitate understanding of the present embodiment, a detailed description will be given first of all of a current-mode control circuit disclosed in the present embodiment with reference to fig. 2, which includes a current transformer module, a window comparator module, a signal isolation module and an integrated monostable circuit module,
the current transformer module, the window comparator module, the signal isolation module and the integrated monostable circuit module are sequentially connected;
the current transformer module comprises a measuring current transformer TA1, a precise current transformer TA2 and a sampling resistor R1, the current transformer module is used for converting primary current of a bus into secondary current, the secondary current is converted into a required alternating current voltage signal through the sampling resistor R1, and the frequency is 50Hz;
the window comparator module comprises an operational amplifier U1A, an operational amplifier U1B, a diode D1, a diode D2 and a pull-down resistor R2, and an alternating voltage signal is converted into a pulse signal through a window comparator formed by the operational amplifier and the diode;
the signal isolation module comprises a photoelectric coupler U2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C1, and a signal channel is isolated by the photoelectric coupler;
the integrated monostable circuit module comprises a monostable trigger circuit U3, a resistor R8, a resistor R9, a capacitor C2, a capacitor C3 and a relay K1, the integrated monostable circuit module converts a plurality of continuous pulse signals into continuous high signals to drive the relay, the relay outputs a closed node, and the closed state is a current criterion for starting conversion.
Furthermore, the type of the measuring current transformer TA1 is AKH-0.66-100III, and the transformation ratio is 5000/5; the model of the precision current transformer TA2 is HCT226JY-2, and the transformation ratio is 5A/2.5mA.
Furthermore, the monostable trigger circuit is a two-channel monostable trigger circuit, the model is MC14538, a two-channel integrated monostable circuit MC14538 is adopted, the output of a channel 1 is connected to the input of a channel 2, a plurality of continuous pulse signals are converted into continuous high signals, the switching value is output, and a state current acquisition port is opened.
In this embodiment, the primary sides P1 and P2 of the bus current TA1, the secondary sides S1 and S2 are connected to the primary side of TA2, the secondary side of TA2 is connected to the sampling resistor R1, the voltage Ui at the two ends of R1 is an ac voltage signal with a frequency of 50Hz, and the strong current is converted into the weak current.
In this embodiment, U1 is an integrated circuit including an operational amplifier U1A and an operational amplifier U1B, and U1A + (in-phase terminal) and U1B- (inverting terminal) are connected to U i Signal one terminal, U i The other end of the signal is grounded GND-ISO, U1A-From the positive terminal VREF + of the threshold voltage, U1B + from the positive terminal VREF-of the threshold voltage, the output of the operational amplifier U1A is connected to the anode of the diode D1, the output of the operational amplifier U1B is connected to the anode of the diode D2, the cathodes of the diodes D1 and D2 are connected in parallel, the output voltage U is out And is grounded GND-ISO through a pull-down resistor R2,
u2 is a photoelectric coupler, the input end of U2 is respectively connected with one end of a resistor R3 and one end of a resistor R4, and the other end of R3 is connected with U out The other end of the resistor R4 is grounded GND-ISO, the output end of U2, one end is connected to the power supply voltage VDD, the other end is connected to one end of a resistor R5, and the other end of the resistor R5 is respectively connected with A of the monostable trigger circuit U3 A One ends of resistors R6 and R7, and the other end of the resistor R7 are respectively connected with one end of a capacitor C1 and B of a monostable trigger circuit U3 B The other ends of the capacitor C1 and the resistor R6 are simultaneously grounded to VSS, and the photoelectric coupler U2 realizes signal isolation.
Is characterized in that U i Unidirectional change from low enough to high enough, U i Value between VREF-and VREF +, U out Set low, not between VREF-and VREF +, U out Set high, output voltage U out And hopping twice.
Positive half wave part U i Higher than VREF +, U1A output is high, U out Set high, lower than VREF +, U1A output low, U1B output low, U out And (5) lowering.
Negative half-wave part U i Below VREF-, U1B output is high, uout is high, above VREF-, U1B output is low, U1A output is low, U out And (5) lowering.
Thereby completing the conversion of the alternating voltage signal into the pulse signal.
In this embodiment, U3 is a dual-channel monostable flip-flop circuit having a retriggerable/unremittable resettable monostable multivibrator, VSS and VDD are the operating power supply of U3, C X R X One end of a resistor R9 is connected with one end of a capacitor C3, the other end of the resistor R9 is connected to VDD, the other end of the capacitor C3 is grounded, a channel A outputs pulse width time TA in a temporary and steady state, and RESETA is a channel A reset input end and is connected to VDD; a. The A 、B A Is the input end of the A channel and is provided with a plurality of input ends,
Q A is the output end of channel A, B A Connection of
Q A To A of U3 B ；
C X R X One end of a resistor R8 is connected with one end of a capacitor C2, the other end of the resistor R8 is connected to VDD, the other end of the capacitor C2 is grounded, and a channel B outputs pulse width time TB; RESETB is a B channel reset input end and is connected to VDD; a. The B 、B B Is the input end of the B channel and is provided with a plurality of channels,
Q B is the output of channel B, Q B Is connected to one end of the relay K1, and the other end of the relay K1 is grounded.
The working principle of the embodiment is as follows:
channel A operates in a non-retriggerable mode, channel A A The rising edge triggers.
B channel is retriggerable, A B Rising edge triggered, B B Enable condition triggered for rising edge, i.e. B B At a high time, A B With rising edge, channel B is triggered, Q B Output TB pulse, during output pulse time (transient steady state period), A B Rising edge input, circuit retriggering, Q B Continue to hold output (pulse lengthening), A B When triggered by successive pulses, Q B The output is high until the input has no rising edge to trigger or reset.
The parameters R7, C1 value, (20K Ω,0.1 μ F) were chosen, the capacitor C1 charging time was about 0.002 seconds, A A At rising edge 1, Q A Output pulse, A B Rising edge input due to B B Is low, Q B No output, no action of relay K1.
The value of the parameter R6 (100K omega) is selected, the safe discharge time of the capacitor C1 is about 0.01 second, A A The time between the 2 nd rising edge input and the 1 st falling edge is far less than 0.01 second)，B B Remains high, Q A Output pulse, A B With rising edge, channel B is triggered, Q B And (4) outputting TB pulse, and electrifying a relay coil.
In the temporary steady state period, because the A channel works in the unretriggerable state, when the 3 rd rising edge is input, a pulse is output after time delay, and A B Rising edge input, B channel circuit retrigger, Q B The output continues to be held (pulse lengthening),
the relay coil is always electrified, the relay acts, and the contact is closed.
When current exists, the rising edge signal is converted into a pulse signal, the continuous rising edge signal is converted into a continuous high signal, the charging/discharging time of a capacitor is reasonably utilized in the process, the 1 st pulse (the 1 st rising edge signal, the pulse width is 5-8 milliseconds) is only the starting condition of circuit triggering, when 2 or more continuous pulses are triggered, the circuit is triggered, the high level is output, the relay is driven to act, and the reliability of current detection is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A current mode control circuit, comprising: a current transformer module, a window comparator module, a signal isolation module and an integrated monostable circuit module,
the current transformer module, the window comparator module, the signal isolation module and the integrated monostable circuit module are sequentially connected;
the current transformer module comprises a measuring current transformer TA1, a precision current transformer TA2 and a sampling resistor R1, and is used for converting primary current of a bus into secondary current;
the window comparator module comprises an operational amplifier U1A, an operational amplifier U1B, a diode D1, a diode D2 and a pull-down resistor R2, and is used for converting an alternating voltage signal into a pulse signal;
the signal isolation module comprises a photoelectric coupler U2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C1;
the integrated monostable circuit module comprises a monostable trigger circuit U3 and a relay K1, and the integrated monostable circuit module is used for converting a plurality of continuous pulse signals into continuous high signals.
2. The control circuit according to claim 1, wherein the secondary side of the measuring current transformer TA1 is connected to the primary side of a precision current transformer TA2, the secondary side of the precision current transformer TA2 is connected to two ends of a sampling resistor R1, and the sampling resistor R1 is used for converting a secondary current into an ac voltage signal.
3. The control circuit of claim 1,
the input end U1A + of the operational amplifier U1A is connected with the input end U1B-of the operational amplifier U1B and is connected with one end of a sampling resistor R1, the other end of the sampling resistor R1 is grounded,
the input end U1A-of the operational amplifier U1A is led from the positive threshold voltage end VREF +,
the output end of the operational amplifier U1A is connected with the anode of the diode D1;
the input end U1B + of the operational amplifier U1B is led from a threshold voltage positive end VREF-, and the output end of the operational amplifier U1B is connected with the anode of a diode D2;
the diode D1 is connected with the cathode of the diode D2 in parallel and is grounded through the pull-down resistor R2.
4. The control circuit according to claim 1, wherein the input end of the photocoupler U2 is connected to one end of a resistor R3 and one end of a resistor R4, respectively, one end of the output end is connected to the supply voltage, and the other end is connected to one end of a resistor R5;
the other end of the resistor R3 is connected with the resistor R2, the other end of the resistor R4 is grounded, and the other end of the resistor R5 is respectively connected with A of the monostable trigger circuit U3 A One end of the port, one end of the resistor R6 and one end of the resistor R7 are connected;
the other end of the resistor R7 is respectively connected with B of the monostable trigger circuit U3 B The port is connected with one end of a capacitor C1;
the other ends of the resistor R6 and the capacitor C1 are grounded.
5. The control circuit of claim 1, wherein said monostable trigger-circuit
RESETA port of U3 is connected to supply voltage, B A Port and Q A Port connection, Q A Port and A B Connecting ports;
the RESETB port of the monostable trigger circuit U3 is connected with a power supply voltage Q B The port is connected with one end of the relay K1, and the other end of the relay K1 is grounded.
6. The control circuit of claim 5, further comprising a capacitor C2, a capacitor C3, a resistor R8, and a resistor R9,
c of the monostable trigger circuit U3 X R X One end of a resistor R9 is connected with one end of a capacitor C3, and the other end of the resistor R is connected with a power supply voltage;
c of the monostable trigger circuit U3 X R X One end of a resistor R8 is connected with one end of the capacitor C2, and the other end of the resistor R8 is connected with a power supply voltage;
the other ends of the capacitor C2 and the capacitor C3 are grounded.
7. The control circuit of claim 1,
the measuring current transformer TA1 is AKH-0.66-100III in model number and has a transformation ratio of 5000/5;
the model of the precision current transformer TA2 is HCT226JY-2, and the transformation ratio is 5A/2.5mA.
8. The control circuit of claim 1, wherein the one-shot circuit is a two-channel one-shot circuit model MC14538.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222799547.5U CN218783719U (en) | 2022-10-24 | 2022-10-24 | Current type control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222799547.5U CN218783719U (en) | 2022-10-24 | 2022-10-24 | Current type control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218783719U true CN218783719U (en) | 2023-03-31 |
Family
ID=85709642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222799547.5U Active CN218783719U (en) | 2022-10-24 | 2022-10-24 | Current type control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218783719U (en) |
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2022
- 2022-10-24 CN CN202222799547.5U patent/CN218783719U/en active Active
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