CN112421754B - Excitation control circuit and UPS - Google Patents
Excitation control circuit and UPS Download PDFInfo
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- CN112421754B CN112421754B CN202011147602.1A CN202011147602A CN112421754B CN 112421754 B CN112421754 B CN 112421754B CN 202011147602 A CN202011147602 A CN 202011147602A CN 112421754 B CN112421754 B CN 112421754B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/067—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems using multi-primary transformers, e.g. transformer having one primary for each AC energy source and a secondary for the loads
Abstract
The invention is applicable to the technical field of UPS, and provides an excitation control circuit and UPS, wherein the excitation control circuit comprises: the current sampling module and the excitation control output module; the excitation control output module detects the size of excitation current data, and when the excitation current data is detected to be not smaller than a first threshold value, the excitation control output module starts to continuously output a first control signal until the excitation current data is detected to be not larger than a second threshold value; when the exciting current data is detected not to be larger than the second threshold value, the second control signal is started to be continuously output until the exciting current data is detected not to be smaller than the first threshold value. The first control signal cuts off the power supply of the isolation transformer, and the second control signal restores the power supply of the isolation transformer; according to the invention, the peak value of the exciting current is reduced, the instantaneous heating of the device is reduced, meanwhile, the return difference of the exciting current is increased, the effective value of the exciting current is reduced as a whole, and the heating of the device is reduced, so that the probability of UPS fault is reduced, and the reliability and stability of the UPS are improved.
Description
Technical Field
The invention belongs to the technical field of UPS (uninterrupted Power supply), and particularly relates to an excitation control circuit and UPS.
Background
The uninterruptible power supply (Uninterruptible Power System, UPS) is a device which can continuously supply power to a load when an alternating current input power supply is abnormal or powered off, and ensure that the load supplies power normally. Because of its excellent performance and convenient maintenance functions, is widely applied in various fields. In order to improve the safety and reliability of a UPS, an isolation transformer is often provided in the UPS to ensure that the load is not affected by the input signal.
When the UPS with the isolation transformer is started, a main power supply circuit in the UPS supplies exciting current to the isolation transformer, and the exciting current is larger and exceeds the bearing capacity of devices in the UPS, so that the devices are damaged to cause the UPS to break down.
Disclosure of Invention
In view of the above, the embodiment of the invention provides an excitation control circuit and a UPS, so as to solve the problem that the UPS is failed due to the damage of devices caused by the large excitation current of an isolation transformer in the prior art.
A first aspect of an embodiment of the present invention provides an excitation control circuit applied to a UPS including an isolation transformer, the excitation control circuit including: the current sampling module and the excitation control output module;
the current sampling module is used for collecting exciting current of the isolation transformer and sending the collected exciting current data to the excitation control output module;
the excitation control output module is used for detecting the size of excitation current data, and when the excitation current data is detected to be not smaller than a first threshold value, the excitation control output module starts to output a first control signal until the excitation current data is detected to be not larger than a second threshold value; when the exciting current data is detected to be not more than a second threshold value, starting to output a second control signal until the exciting current data is detected to be not less than the first threshold value;
the first control signal is used for disconnecting the power supply of the isolation transformer, and the second control signal is used for recovering the power supply of the isolation transformer;
wherein the first threshold is greater than the second threshold.
Optionally, the current sampling module includes: a current sampling unit and a first signal conversion unit;
the current acquisition unit is used for acquiring exciting current of the isolation transformer and transmitting initial current data acquired by the current acquisition unit to the first signal conversion unit;
the first signal conversion unit obtains exciting current data by calculating absolute value of initial current data.
Optionally, the first signal conversion unit includes: the first comparator, the first unidirectional conduction element, the second unidirectional conduction element, the first resistor and the second resistor;
the first input end of the first comparator is respectively connected with the first end of the first resistor and the first end of the second resistor, the second input end of the first comparator is grounded, and the output end of the first comparator is respectively connected with the second end of the second resistor and the anode of the first unidirectional conducting element;
the second end of the first resistor is connected with the anode of the second unidirectional conducting element, and the second end of the first resistor is also used for receiving initial current data;
the cathode of the second unidirectional conduction element is connected with the cathode of the first unidirectional conduction element, and the cathode of the second unidirectional conduction element is also used for outputting exciting current data.
Optionally, the excitation control output module includes: a comparison unit and a second signal conversion unit;
the comparing unit is connected with the first input end and the reference voltage end, the second input end is used for receiving exciting current data, and the output end is connected with the input end of the second signal converting unit;
the output end of the second signal conversion unit outputs a first control signal or a second control signal;
the comparison unit is used for determining a first threshold value and a second threshold value according to the voltage of the reference voltage end and comparing the exciting current data with the first threshold value and the second threshold value; when the exciting current data is not smaller than a first threshold value, starting to continuously output a first intermediate signal until the exciting current data is not larger than a second threshold value; when the exciting current data is not more than the second threshold value, starting to continuously output the second intermediate signal until the exciting current data is not less than the first threshold value;
the second signal conversion unit is used for conditioning the first intermediate signal to obtain a first control signal, and conditioning the second intermediate signal to obtain a second control signal.
Optionally, the comparing unit includes: the second comparator, the first capacitor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the third unidirectional conductive element;
the first input end of the second comparator is respectively connected with the first end of the third resistor, the first end of the first capacitor and the anode of the third unidirectional conducting element, the second input end of the second comparator is respectively connected with the first end of the fourth resistor and the first end of the fifth resistor, and the output end of the second comparator is respectively connected with the first end of the sixth resistor and the output end of the comparison unit;
the second end of the third resistor is connected with the first input end of the comparison unit; the second end of the fourth resistor is connected with the second input end of the comparison unit; the second end of the fifth resistor and the second end of the first capacitor are grounded;
the negative electrode of the third unidirectional conduction element is connected with the second end of the sixth resistor.
Optionally, the second signal conversion unit includes: the fourth unidirectional conduction element, the seventh resistor, the eighth resistor, the ninth resistor, the second capacitor and the third capacitor;
the anode of the fourth unidirectional conduction element is respectively connected with the first end of the seventh resistor, the first end of the second capacitor and the input end of the second signal conversion unit, and the cathode of the fourth unidirectional conduction element is respectively connected with the first end of the eighth resistor, the first end of the ninth resistor, the first end of the third capacitor and the output end of the second signal conversion unit;
the second end of the seventh resistor is connected with the first power supply end; the second end of the ninth resistor is connected with a second power supply end;
the second end of the second capacitor, the second end of the third capacitor and the second end of the eighth resistor are all grounded.
Optionally, the excitation control circuit further includes: a reference voltage generation module; the reference voltage generation module includes: a third comparator, a tenth resistor, an eleventh resistor, and a fourth capacitor;
the first input end of the third comparator is respectively connected with the first end of the fourth capacitor, the first end of the tenth resistor and the first end of the eleventh resistor, and the second input end and the output end of the third comparator are both connected with the reference voltage end;
the second end of the tenth resistor is connected with the first power supply end;
the second end of the eleventh resistor and the second end of the fourth capacitor are grounded.
Optionally, the excitation control circuit further includes: and an AND gate;
the AND gate is used for receiving the first control signal or the second control signal at a first input end, receiving the initial driving signal at a second input end and outputting the target driving signal at an output end;
the target drive signal is used to control the supply of the isolation transformer.
A second aspect of an embodiment of the present invention provides a UPS, including a main power supply circuit, an isolation transformer, and an excitation control circuit as provided in the first aspect of the embodiment of the present invention;
the main power supply circuit supplies power to the isolation transformer;
the excitation control circuit is respectively connected with the isolation transformer and the main power supply circuit.
The embodiment of the invention provides an excitation control circuit, which is applied to a UPS comprising an isolation transformer, and comprises: the current sampling module and the excitation control output module; the current sampling module is used for collecting exciting current of the isolation transformer and sending the collected exciting current data to the excitation control output module; the excitation control output module is used for detecting the size of excitation current data, and when the excitation current data is detected to be not smaller than a first threshold value, the excitation control output module starts to output a first control signal until the excitation current data is detected to be not larger than a second threshold value; when the exciting current data is detected to be not more than a second threshold value, starting to output a second control signal until the exciting current data is detected to be not less than the first threshold value; the first control signal is used for disconnecting the power supply of the isolation transformer, and the second control signal is used for recovering the power supply of the isolation transformer; wherein the first threshold is greater than the second threshold. According to the embodiment of the invention, the peak value of exciting current is reduced through the exciting control circuit, and short-time heating is reduced; meanwhile, by lengthening the excitation time, the return difference of the excitation current of the isolation transformer is increased, the effective value of the excitation current is reduced as a whole, and the heating of the device is reduced, so that the probability of UPS fault is reduced, and the reliability and stability of the UPS are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of an excitation control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an excitation control circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a UPS according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Referring to fig. 1, an embodiment of the present invention provides an excitation control circuit 10, applied to a UPS including an isolation transformer T, the excitation control circuit 10 including: a current sampling module 11 and an excitation control output module 12;
the current sampling module 11 is used for collecting exciting current of the isolation transformer T and transmitting the collected exciting current data to the excitation control output module 12;
the excitation control output module 12 is configured to detect a magnitude of excitation current data, and when the excitation current data is detected to be not less than a first threshold value, start outputting a first control signal until the excitation current data is detected to be not greater than a second threshold value; when the exciting current data is detected to be not more than a second threshold value, starting to output a second control signal until the exciting current data is detected to be not less than the first threshold value;
the first control signal is used for disconnecting the power supply of the isolation transformer T, and the second control signal is used for recovering the power supply of the isolation transformer T;
wherein the first threshold is greater than the second threshold.
The excitation control circuit 10 provided in this embodiment collects the excitation current of the isolation transformer T and detects the magnitude of the excitation current, when the excitation current data is greater than the first threshold value, the power supply of the isolation transformer T is disconnected, and at this time, the excitation current of the isolation transformer T starts to continuously decrease, that is, the excitation current data starts to continuously decrease; when the exciting current data of the isolation transformer T is reduced to the second threshold value, the power supply of the isolation transformer T is restored, the exciting current of the isolation transformer T starts to continuously rise until the exciting current data reaches the first threshold value, and the actions are repeated. Therefore, the exciting current of the isolation transformer T reciprocally changes in a preset range, the peak value of the exciting current is reduced, and the short-time heating is reduced; meanwhile, the return difference of the exciting current of the isolation transformer is increased by lengthening the exciting time, so that the effective value of the exciting current is greatly reduced, the heating of devices in the UPS is reduced, the probability of damaging the devices is further reduced, and the reliability and stability of the UPS are improved.
In some embodiments, the current sampling module 11 may include: a current sampling unit 111 and a first signal conversion unit 112;
the current sampling unit 111 is configured to collect exciting current of the isolation transformer T, and send initial current data obtained by collection to the first signal conversion unit 112;
the first signal conversion unit 112 obtains excitation current data by taking an absolute value of the initial current data.
In some embodiments, referring to fig. 2, the first signal conversion unit 112 may include: the first comparator U1, the first unidirectional conduction element D1, the second unidirectional conduction element D2, the first resistor R1 and the second resistor R2;
the first input end of the first comparator U1 is respectively connected with the first end of the first resistor R1 and the first end of the second resistor R2, the second input end of the first comparator U is grounded, and the output end of the first comparator U is respectively connected with the second end of the second resistor R2 and the anode of the first unidirectional conducting element D1;
the second end of the first resistor R1 is connected with the anode of the second unidirectional conduction element D2, and the second end of the first resistor R1 is also used for receiving initial current data;
the cathode of the second unidirectional conduction element D2 is connected with the cathode of the first unidirectional conduction element D1, and the cathode of the second unidirectional conduction element D2 is also used for outputting exciting current data.
In some embodiments, the first input of the first comparator U1 may be a negative input and the second input of the first comparator U1 may be a positive input.
Since the exciting current is positive or negative, the first signal conversion unit 112 in the embodiment of the present invention converts all the collected initial current data into positive values. For example, when the initial current data is positive, the second unidirectional conductive element D2 is turned on, the first unidirectional conductive element D1 is turned off, and the initial current data is output through the second unidirectional conductive element D2; when the initial current data is negative, the first unidirectional conduction element D1 is turned on, the second unidirectional conduction element D2 is turned off, and the initial current data is inverted by the comparator to be converted into positive value and then is output by the first unidirectional conduction element D1.
In some embodiments, the excitation control output module 12 includes: a comparing unit 121 and a second signal converting unit 122;
the comparing unit 121 has a first input terminal connected to the reference voltage terminal, a second input terminal for receiving exciting current data, and an output terminal connected to an input terminal of the second signal converting unit 122;
the output terminal of the second signal conversion unit 122 outputs the first control signal or the second control signal;
the comparing unit 121 is configured to determine a first threshold value and a second threshold value according to a voltage of the reference voltage terminal, and compare the exciting current data with the first threshold value and the second threshold value; when the exciting current data is not smaller than a first threshold value, starting to continuously output a first intermediate signal until the exciting current data is not larger than a second threshold value; when the exciting current data is not more than the second threshold value, starting to continuously output the second intermediate signal until the exciting current data is not less than the first threshold value;
the second signal conversion unit is used for conditioning the first intermediate signal to obtain a first control signal, and conditioning the second intermediate signal to obtain a second control signal.
In some embodiments, referring to fig. 2, the comparison unit 121 includes: the second comparator U2, the first capacitor C1, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the third unidirectional conductive element D3;
the first input end of the second comparator U2 is respectively connected with the first end of the third resistor R3, the first end of the first capacitor C1 and the anode of the third unidirectional conducting element D3, the second input end of the second comparator U2 is respectively connected with the first end of the fourth resistor R4 and the first end of the fifth resistor R5, and the output end of the second comparator U2 is respectively connected with the first end of the sixth resistor R6 and the output end of the comparison unit 121;
the second end of the third resistor R3 is connected to the first input end of the comparing unit 121; a second end of the fourth resistor R4 is connected to a second input end of the comparing unit 121; the second end of the fifth resistor R5 and the second end of the first capacitor C1 are grounded;
the negative electrode of the third unidirectional conduction element D3 is connected to the second end of the sixth resistor R6.
In some embodiments, the first input of the second comparator U2 is a positive input and the second input of the second comparator U2 is a negative input.
Referring to fig. 2, in the embodiment of the present invention, the first threshold value and the second threshold value are determined by the voltage value of the reference voltage terminal. For example, the value of the exciting current data is proportional to the magnitude of the exciting current of the isolation transformer T, and when the exciting current data of the isolation transformer T is smaller than the first threshold value, the voltage of the positive input terminal of the second comparator U2 is greater than the voltage of the negative input terminal, and the second comparator U2 outputs a high level. As the exciting current increases, the exciting current data gradually increases, and when the exciting current data reaches the first threshold value, at this time, the voltage of the positive input terminal of the second comparator U2 is not greater than the voltage of the negative input terminal, and the second comparator U2 starts to output a low level. Theoretically, when the second comparator U2 outputs a low level, the power supply of the isolation transformer T is disconnected and the exciting current decreases. If the voltage at the positive input end of the second comparator U2 is unchanged, the voltage at the positive input end of the second comparator U2 is greater than the voltage at the negative input end, and the second comparator U2 outputs a high level.
However, since the third unidirectional conductive element D3 is turned on when the second comparator U2 outputs a low level, and the third resistor R3 is divided by the sixth resistor R6, the voltage of the positive input terminal of the second comparator U2 decreases, and therefore, although the exciting current of the isolation transformer T decreases, the second comparator U2 continues to output a low level due to a change in the voltage of the positive input terminal, and the power supply of the isolation transformer T is still in an off state. When the value of the exciting current data reaches the second threshold value, the voltage of the negative input end of the second comparator U2 is not greater than the voltage of the positive input end, the power supply of the isolation transformer T is recovered, the exciting current of the isolation transformer T starts to rise gradually, and the actions are repeated.
As can be seen, the arrangement of the third unidirectional conducting element D3 in the comparing unit 121 increases the return difference and period of the exciting current by automatically adjusting the voltage of the positive input terminal of the second comparator U2, and decreases the effective value of the exciting current as a whole, thereby improving the reliability and effectiveness of the UPS.
In some embodiments, the return difference of the exciting current of the isolation transformer T can be adjusted by adjusting the resistances of the third resistor R3 and the sixth resistor R6 and the voltage value of the reference voltage terminal to adjust the first threshold and the second threshold.
In some embodiments, referring to fig. 2, the second signal conversion unit 122 includes: the fourth unidirectional conduction element D4, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the second capacitor C2 and the third capacitor C3;
the anode of the fourth unidirectional conductive element D4 is respectively connected to the first end of the seventh resistor R7, the first end of the second capacitor C2, and the input end of the second signal conversion unit 122, and the cathode is respectively connected to the first end of the eighth resistor R8, the first end of the ninth resistor R9, the first end of the third capacitor C3, and the output end of the second signal conversion unit 122;
the second end of the seventh resistor R7 is connected with the first power supply end VCC 1; a second end of the ninth resistor R9 is connected with a second power supply end VCC 2;
the second end of the second capacitor C2, the second end of the third capacitor C3 and the second end of the eighth resistor R8 are all grounded.
In some embodiments, the voltage of the first power source terminal VCC1 may be +15v, and the voltage of the second power source terminal VCC2 may be +3.3v.
In the embodiment of the present invention, the conversion of the signal level is achieved by the second signal conversion unit 122. For example, the embodiment of the invention may also be provided with a main control module, and the main control module is used for controlling the power supply of the isolation transformer T, so that signal level conversion is required.
Meanwhile, in order to prevent the second signal conversion unit 122 from affecting the signal of the comparing unit 121, in the embodiment of the present invention, the second signal conversion unit 122 is provided with the fourth unidirectional conductive element D4, so as to isolate the second signal conversion unit 122 from the comparing unit 121, and prevent signal crosstalk.
In some embodiments, referring to fig. 2, the excitation control circuit 10 further includes: a reference voltage generation module 13; the reference voltage generation module 13 includes: a third comparator U3, a tenth resistor R10, an eleventh resistor R11, and a fourth capacitor C4;
the first input end of the third comparator U3 is respectively connected with the first end of the fourth capacitor C4, the first end of the tenth resistor R10 and the first end of the eleventh resistor R11, and the second input end and the output end are both connected with the reference voltage end;
the second end of the tenth resistor R10 is connected with the first power end VCC 1;
the second end of the eleventh resistor R11 and the second end of the fourth capacitor C4 are grounded.
In some embodiments, referring to fig. 2, the excitation control circuit 10 further includes: and an AND gate;
the AND gate is used for receiving the first control signal or the second control signal at a first input end, receiving the initial driving signal at a second input end and outputting the target driving signal at an output end;
the target drive signal is used to control the supply of the isolation transformer T.
The initial driving signal is a power supply control signal of an original isolation transformer T in the UPS, namely a switch control signal of a main power supply circuit 20 in the UPS.
Referring to fig. 3, corresponding to the above embodiment, the embodiment of the present invention further provides a UPS, including a main power supply circuit 20, an isolation transformer T, and the excitation control circuit 10 provided in the above embodiment;
the main power supply circuit 20 supplies power to the isolation transformer T;
the excitation control circuit 10 is connected to the isolation transformer T and the main power supply circuit 20, respectively.
As in the above embodiment, when the excitation control circuit 10 detects that the excitation current data of the isolation transformer T is greater than the first threshold value, the main power supply circuit 20 is controlled to be not operated, the power supply of the isolation transformer T is disconnected, and the excitation current of the isolation transformer T starts to decrease; when the exciting current data of the isolation transformer T is reduced to be smaller than a second threshold value, the main power supply circuit 20 is controlled to work, the power supply of the isolation transformer T is recovered, and the exciting current of the isolation transformer T starts to rise; the above-described operation is repeated when the exciting current data of the isolation transformer T rises to reach the first threshold value. Therefore, the UPS provided by the embodiment of the invention reduces the peak value of the exciting current, thereby reducing the short-time heating of devices, increasing the return difference of the exciting current, reducing the effective value of the exciting current, reducing the probability of device damage and improving the reliability and the stability of the UPS.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (9)
1. An excitation control circuit for use in a UPS including an isolation transformer, the excitation control circuit comprising: the current sampling module and the excitation control output module;
the current sampling module is used for collecting exciting current of the isolation transformer and sending exciting current data obtained by collection to the excitation control output module;
the excitation control output module is used for detecting the size of the excitation current data, and when the excitation current data is detected to be not smaller than a first threshold value, the excitation control output module starts to output a first control signal until the excitation current data is detected to be not larger than a second threshold value; when the exciting current data is detected not to be larger than the second threshold value, starting to output a second control signal until the exciting current data is detected not to be smaller than the first threshold value;
the first control signal is used for disconnecting the power supply of the isolation transformer, and the second control signal is used for recovering the power supply of the isolation transformer;
wherein the first threshold is greater than the second threshold.
2. The excitation control circuit of claim 1, wherein the current sampling module comprises: a current sampling unit and a first signal conversion unit;
the current acquisition unit is used for acquiring exciting current of the isolation transformer and sending initial current data acquired by acquisition to the first signal conversion unit;
the first signal conversion unit obtains the exciting current data by calculating an absolute value of the initial current data.
3. The excitation control circuit according to claim 2, wherein the first signal conversion unit includes: the first comparator, the first unidirectional conduction element, the second unidirectional conduction element, the first resistor and the second resistor;
the first input end of the first comparator is respectively connected with the first end of the first resistor and the first end of the second resistor, the second input end of the first comparator is grounded, and the output end of the first comparator is respectively connected with the second end of the second resistor and the anode of the first unidirectional conducting element;
the second end of the first resistor is connected with the anode of the second unidirectional conduction element, and the second end of the first resistor is also used for receiving the initial current data;
the cathode of the second unidirectional conduction element is connected with the cathode of the first unidirectional conduction element, and the cathode of the second unidirectional conduction element is also used for outputting the excitation current data.
4. The excitation control circuit of claim 1, wherein the excitation control output module comprises: a comparison unit and a second signal conversion unit;
the first input end of the comparison unit is connected with the reference voltage end, the second input end of the comparison unit is used for receiving the exciting current data, and the output end of the comparison unit is connected with the input end of the second signal conversion unit;
the output end of the second signal conversion unit outputs the first control signal or the second control signal;
the comparison unit is used for determining the first threshold value and the second threshold value according to the voltage of the reference voltage end and comparing the exciting current data with the first threshold value and the second threshold value; when the exciting current data is not smaller than the first threshold value, starting to continuously output a first intermediate signal until the exciting current data is not larger than the second threshold value; when the exciting current data is not larger than the second threshold value, starting to continuously output a second intermediate signal until the exciting current data is not smaller than the first threshold value;
the second signal conversion unit is used for conditioning the first intermediate signal to obtain the first control signal, and conditioning the second intermediate signal to obtain the second control signal.
5. The excitation control circuit according to claim 4, wherein the comparing unit includes: the second comparator, the first capacitor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the third unidirectional conductive element;
the first input end of the second comparator is respectively connected with the first end of the third resistor, the first end of the first capacitor and the anode of the third unidirectional conduction element, the second input end of the second comparator is respectively connected with the first end of the fourth resistor and the first end of the fifth resistor, and the output end of the second comparator is respectively connected with the first end of the sixth resistor and the output end of the comparison unit;
the second end of the third resistor is connected with the first input end of the comparison unit; the second end of the fourth resistor is connected with the second input end of the comparison unit; a second end of the fifth resistor and a second end of the first capacitor are grounded;
and the negative electrode of the third unidirectional conduction element is connected with the second end of the sixth resistor.
6. The excitation control circuit of claim 5, wherein the second signal conversion unit includes: the fourth unidirectional conduction element, the seventh resistor, the eighth resistor, the ninth resistor, the second capacitor and the third capacitor;
the anode of the fourth unidirectional conduction element is respectively connected with the first end of the seventh resistor, the first end of the second capacitor and the input end of the second signal conversion unit, and the cathode of the fourth unidirectional conduction element is respectively connected with the first end of the eighth resistor, the first end of the ninth resistor, the first end of the third capacitor and the output end of the second signal conversion unit;
the second end of the seventh resistor is connected with the first power supply end; the second end of the ninth resistor is connected with a second power supply end;
the second end of the second capacitor, the second end of the third capacitor and the second end of the eighth resistor are all grounded.
7. The excitation control circuit of claim 4, wherein the excitation control circuit further comprises: a reference voltage generation module; the reference voltage generation module includes: a third comparator, a tenth resistor, an eleventh resistor, and a fourth capacitor;
the first input end of the third comparator is respectively connected with the first end of the fourth capacitor, the first end of the tenth resistor and the first end of the eleventh resistor, and the second input end and the output end of the third comparator are both connected with the reference voltage end;
the second end of the tenth resistor is connected with the first power supply end;
the second end of the eleventh resistor and the second end of the fourth capacitor are grounded.
8. The excitation control circuit according to any one of claims 1 to 7, further comprising: and an AND gate;
the AND gate is provided with a first input end for receiving the first control signal or the second control signal, a second input end for receiving an initial driving signal and an output end for outputting a target driving signal;
the target drive signal is used to control the supply of power to the isolation transformer.
9. A UPS comprising a main power supply circuit, the isolation transformer, and the excitation control circuit of any one of claims 1 to 8;
the main power supply circuit supplies power to the isolation transformer;
the excitation control circuit is respectively connected with the isolation transformer and the main power supply circuit.
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| CN202011147602.1A CN112421754B (en) | 2020-10-23 | 2020-10-23 | Excitation control circuit and UPS |
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| CN202011147602.1A CN112421754B (en) | 2020-10-23 | 2020-10-23 | Excitation control circuit and UPS |
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| CN112421754A CN112421754A (en) | 2021-02-26 |
| CN112421754B true CN112421754B (en) | 2023-04-28 |
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| JP2006158081A (en) * | 2004-11-29 | 2006-06-15 | Fuji Electric Systems Co Ltd | Uninterruptible power supply unit and control method for start of uninterruptible power supply unit |
| JP4753910B2 (en) * | 2007-04-16 | 2011-08-24 | 東芝三菱電機産業システム株式会社 | Uninterruptible power system |
| JPWO2013038496A1 (en) * | 2011-09-13 | 2015-03-23 | 東芝三菱電機産業システム株式会社 | Power system |
| CN105141209B (en) * | 2015-08-01 | 2017-12-08 | 漳州科华技术有限责任公司 | Reduce the method and device of the transformer magnetizing current of isolation UPS by-path turn-ons |
| CN207732508U (en) * | 2018-01-25 | 2018-08-14 | 青田宇电科技有限公司 | A kind of ups system |
| CN108429285A (en) * | 2018-03-29 | 2018-08-21 | 武汉理工大学 | It is a kind of to be suitable for the peculiar to vessel from the two-way frequency-changing and current transforming device of grid-connected mixed type of kHz grades of alternating currents |
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