CN112421754A - Excitation control circuit and UPS - Google Patents
Excitation control circuit and UPS Download PDFInfo
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- CN112421754A CN112421754A CN202011147602.1A CN202011147602A CN112421754A CN 112421754 A CN112421754 A CN 112421754A CN 202011147602 A CN202011147602 A CN 202011147602A CN 112421754 A CN112421754 A CN 112421754A
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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
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Abstract
The invention is suitable for the technical field of UPS, has provided a excitation control circuit and UPS, the excitation control circuit includes: 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 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 not larger than a second threshold value; and when the excitation current data is not larger than the second threshold value, starting to continuously output the second control signal until the excitation current data is not smaller than the first threshold value. The first control signal disconnects the power supply of the isolation transformer, and the second control signal restores the power supply of the isolation transformer; the invention reduces the instantaneous heating of the device by reducing the peak value of the exciting current, and simultaneously enlarges the return difference of the exciting current, thereby integrally reducing the effective value of the exciting current and reducing the heating of the device, thereby reducing the failure probability of the UPS and improving the reliability and the stability of the UPS.
Description
Technical Field
The invention belongs to the technical field of a UPS (uninterrupted power supply), and particularly relates to an excitation control circuit and a UPS.
Background
An Uninterruptible Power Supply (UPS) is a device that can continue to supply Power to a load when an ac input Power supply is abnormal or is powered off, thereby ensuring that the load supplies Power normally. The cable has excellent performance and convenient maintenance function, and is widely applied to various fields. In order to improve the safety and reliability of the UPS, an isolation transformer is usually 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 provides exciting current for 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 failure of the UPS.
Disclosure of Invention
In view of this, embodiments of the present invention provide an excitation control circuit and a UPS, so as to solve the problem in the prior art that a UPS fault is caused by a device damage due to a large excitation current of an isolation transformer.
A first aspect of an embodiment of the present invention provides an excitation control circuit, which is applied to a UPS including an isolation transformer, and includes: the current sampling module and the excitation control output module;
the current sampling module is used for collecting the 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 not smaller than a first threshold value, a first control signal is started to be output until the excitation current data is not larger than a second threshold value; when detecting that the exciting current data is not larger than the second threshold value, starting to output a second control signal until detecting that the exciting current data is not 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.
Optionally, the current sampling module includes: the device comprises a current sampling unit and a first signal conversion unit;
the current acquisition unit is used for acquiring the exciting current of the isolation transformer and sending the acquired initial current data to the first signal conversion unit;
the first signal conversion unit is used for solving the absolute value of the initial current data to obtain the exciting current data.
Optionally, the first signal conversion unit includes: the circuit comprises a first comparator, a first unidirectional conducting element, a second unidirectional conducting element, a first resistor and a 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 one-way conduction element;
the second end of the first resistor is connected with the anode of the second one-way conduction element, and the second end of the first resistor is also used for receiving initial current data;
and the cathode of the second one-way conduction element is connected with the cathode of the first one-way conduction element, and the cathode of the second one-way conduction element is also used for outputting excitation current data.
Optionally, the excitation control output module includes: 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 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 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 the first threshold value, continuously outputting the 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, continuously outputting 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 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 one-way conduction element;
a first input end of the first comparator is connected with a first end of the first resistor, a first end of the first capacitor and an anode of the first unidirectional conducting element respectively;
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;
and the cathode of the third one-way conduction element is connected with the second end of the sixth resistor.
Optionally, the second signal conversion unit includes: the fourth unidirectional conducting element, the seventh resistor, the eighth resistor, the ninth resistor, the second capacitor and the third capacitor;
the anode of the fourth unidirectional conducting element is 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 respectively, and the cathode of the fourth unidirectional conducting element is 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 respectively;
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 the 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 generating module; the reference voltage generating module includes: a third comparator, a tenth resistor, an eleventh resistor and a fourth capacitor;
a first input end of the third comparator is connected with a first end of the fourth capacitor, a first end of the tenth resistor and a first end of the eleventh resistor respectively, and a second input end and an output end of the third comparator are connected with the reference voltage end;
a 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 both grounded.
Optionally, the excitation control circuit further includes: an AND gate;
the first input end of the AND gate is used for receiving a first control signal or a second control signal, the second input end of the AND gate is used for receiving an initial driving signal, and the output end of the AND gate is used for outputting a target driving signal;
the target drive signal is used to control the power 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 an 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 (uninterrupted power supply) comprising an isolation transformer, and comprises the following components: the current sampling module and the excitation control output module; the current sampling module is used for collecting the 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 not smaller than a first threshold value, a first control signal is started to be output until the excitation current data is not larger than a second threshold value; when detecting that the exciting current data is not larger than the second threshold value, starting to output a second control signal until detecting that the exciting current data is not 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. According to the embodiment of the invention, the peak value of the exciting current is reduced through the exciting control circuit, and the short-time heating is reduced; meanwhile, by prolonging the excitation time and enlarging the return difference of the excitation current of the isolation transformer, the effective value of the excitation current is integrally reduced, and the heating of a device is reduced, so that the failure probability of the UPS is reduced, and the reliability and the stability of the UPS are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
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 particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the 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 explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, an embodiment of the present invention provides an excitation control circuit 10, which is applied to a UPS including an isolation transformer T, where the excitation control circuit 10 includes: a current sampling module 11 and an excitation control output module 12;
the current sampling module 11 is used for collecting the exciting current of the isolation transformer T and sending 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 detecting that the excitation current data is not smaller than a first threshold, start outputting a first control signal until detecting that the excitation current data is not larger than a second threshold; when detecting that the exciting current data is not larger than the second threshold value, starting to output a second control signal until detecting that the exciting current data is not smaller 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, and when the excitation current data is greater than the first threshold, the power supply of the isolation transformer T is turned off, 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 recovered, and the exciting current of the isolation transformer T starts to continuously rise again until the exciting current data reaches the first threshold value, and then the actions are repeated. Therefore, the exciting current of the isolation transformer T is changed in a reciprocating manner within a preset range, the peak value of the exciting current is reduced, and short-time heating is reduced; meanwhile, the excitation time is prolonged, and the return difference of the excitation current of the isolation transformer is enlarged, so that the effective value of the excitation current is greatly reduced, the heating of devices in the UPS is reduced, the probability of damage of the devices is reduced, and the reliability and the 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 an excitation current of the isolation transformer T, and send the collected initial current data to the first signal conversion unit 112;
the first signal conversion unit 112 obtains the excitation current data by calculating the absolute value of the initial current data.
In some embodiments, referring to fig. 2, the first signal conversion unit 112 may include: the circuit comprises a first comparator U1, a first one-way conducting element D1, a second one-way conducting element D2, a first resistor R1 and a second resistor R2;
a first comparator U1, a first input terminal of which is connected to the first terminal of the first resistor R1 and the first terminal of the second resistor R2, respectively, a second input terminal of which is grounded, and an output terminal of which is connected to the second terminal of the second resistor R2 and the anode of the first unidirectional conducting element D1, respectively;
a second end of the first resistor R1 is connected to the anode of the second unidirectional conducting element D2, and a second end of the first resistor R1 is further used for receiving initial current data;
the cathode of the second one-way conduction element D2 is connected to the cathode of the first one-way conduction element D1, and the cathode of the second one-way conduction element D2 is also used for outputting excitation 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 has positive or negative, the first signal conversion unit 112 converts all the acquired initial current data into positive values in the embodiment of the present invention. For example, when the initial current data is a positive value, the second one-way conduction element D2 is turned on, the first one-way conduction element D1 is turned off, and the initial current data is output through the second one-way conduction element D2; when the initial current data is negative, the first one-way conduction element D1 is turned on, the second one-way conduction element D2 is turned off, and the initial current data is inverted by the comparator to be positive and then output through the first one-way conduction element D1.
In some embodiments, the excitation control output module 12 includes: a comparing unit 121 and a second signal converting unit 122;
a comparison unit 121, a first input end of which is connected to the reference voltage end, a second input end of which is used for receiving the exciting current data, and an output end of which is connected to the input end of the second signal conversion unit 122;
the output end 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 and a second threshold according to a voltage of the reference voltage terminal, and compare the excitation current data with the first threshold and the second threshold; when the exciting current data is not smaller than the first threshold value, continuously outputting the 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, continuously outputting 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 a first control signal and conditioning the second intermediate signal to obtain a second control signal.
In some embodiments, referring to fig. 2, the comparing unit 121 includes: the circuit comprises a second comparator U2, a first capacitor C1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a third one-way conduction element D3;
a second comparator U2, a first input terminal of which is connected to the first terminal of the third resistor R3, the first terminal of the first capacitor C1, and the anode of the third unidirectional conductive element D3, a second input terminal of which is connected to the first terminal of the fourth resistor R4 and the first terminal of the fifth resistor R5, and an output terminal of which is connected to the first terminal of the sixth resistor R6 and the output terminal of the comparing unit 121;
a second terminal of the third resistor R3 is connected to a first input terminal of the comparing unit 121; a second terminal of the fourth resistor R4 is connected to a second input terminal of the comparing unit 121; a second end of the fifth resistor R5 and a second end of the first capacitor C1 are grounded;
the negative electrode of the third unidirectional conducting 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 and the second threshold are determined by a voltage value of the reference voltage terminal. For example, the value of the excitation current data is proportional to the magnitude of the excitation current of the isolation transformer T, when the excitation current data of the isolation transformer T is smaller than the first threshold, 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 field current increases, the field current data gradually increases, and when the field current data reaches the first threshold, at which time the voltage at the positive input terminal of the second comparator U2 is not greater than the voltage at the negative input terminal, the second comparator U2 starts outputting a low level. Theoretically, when the second comparator U2 outputs a low level, the power supply to the isolation transformer T is disconnected and the field current decreases. If the voltage at the positive input terminal of the second comparator U2 is not changed, the voltage at the positive input terminal of the second comparator U2 is higher than the voltage at the negative input terminal, 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, the third resistor R3 and the sixth resistor R6 divide the voltage, and the voltage at the positive input terminal of the second comparator U2 decreases, although the excitation current of the isolation transformer T decreases, the second comparator U2 continues to output a low level due to the change of the voltage at 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 gradually rise, and the above operations are repeated.
Therefore, the third unidirectional conductive element D3 in the comparing unit 121 increases the return difference and the period of the exciting current by automatically adjusting the voltage at the positive input terminal of the second comparator U2, so as to reduce the effective value of the exciting current as a whole, thereby improving the reliability and effectiveness of the UPS.
In some embodiments, the first threshold and the second threshold may be adjusted by adjusting the resistance values of the third resistor R3 and the sixth resistor R6, and the voltage value of the reference voltage terminal, so as to adjust the back difference of the excitation current of the isolation transformer T.
In some embodiments, referring to fig. 2, the second signal conversion unit 122 includes: a fourth unidirectional conductive element D4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2 and a third capacitor C3;
a fourth unidirectional conducting element D4, having an anode 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 a cathode 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;
a second terminal of the seventh resistor R7 is connected to a first power supply terminal VCC 1; a second terminal of the ninth resistor R9 is connected to a second power supply terminal VCC 2;
the second terminal of the second capacitor C2, the second terminal of the third capacitor C3, and the second terminal of the eighth resistor R8 are all grounded.
In some embodiments, the voltage of the first power supply terminal VCC1 may be +15V, and the voltage of the second power supply terminal VCC2 may be + 3.3V.
In the embodiment of the present invention, the second signal conversion unit 122 is used to convert the signal level. For example, the embodiment of the present invention may further include a main control module, which sends the first control signal or the second control signal to the main control module, and the main control module controls power supply of the isolation transformer T, so that signal level conversion is required.
Meanwhile, in order to prevent the second signal converting unit 122 from affecting the signal of the comparing unit 121, in the embodiment of the present invention, the second signal converting unit 122 is provided with a fourth unidirectional conducting element D4, which isolates the second signal converting unit 122 from the comparing unit 121, so as to 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;
a third comparator U3, a first input terminal of which is connected to the first terminal of the fourth capacitor C4, the first terminal of the tenth resistor R10 and the first terminal of the eleventh resistor R11, respectively, and a second input terminal and an output terminal of which are connected to the reference voltage terminal;
a second terminal of the tenth resistor R10 is connected to a first power supply terminal VCC 1;
the second terminal of the eleventh resistor R11 and the second terminal of the fourth capacitor C4 are both grounded.
In some embodiments, referring to fig. 2, the excitation control circuit 10 further includes: an AND gate;
the first input end of the AND gate is used for receiving a first control signal or a second control signal, the second input end of the AND gate is used for receiving an initial driving signal, and the output end of the AND gate is used for outputting a target driving signal;
the target drive signal is used to control the power supply of the isolation transformer T.
The initial driving signal is a power supply control signal of the isolation transformer T existing in the UPS, i.e., a switching control signal of the main power supply circuit 20 in the UPS.
Referring to fig. 3, corresponding to the above embodiment, an 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 an isolation transformer T and a main power supply circuit 20.
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, the main power supply circuit 20 is controlled not to operate, 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, controlling the main power supply circuit 20 to work, recovering the power supply of the isolation transformer T, and starting to increase the exciting current of the isolation transformer T; the above operation is repeated when the excitation 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 the device, simultaneously increasing the return difference of the exciting current, reducing the effective value of the exciting current, reducing the probability of the damage of the device and improving the reliability and the stability of the UPS.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. An excitation control circuit for 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 the 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 the excitation current data, and when the excitation current data is not smaller than a first threshold value, a first control signal is started to be output until the excitation current data is not larger than a second threshold value; when detecting that the exciting current data is not larger than the second threshold value, starting to output a second control signal until detecting that the exciting current data is not 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: the device comprises a current sampling unit and a first signal conversion unit;
the current acquisition unit is used for acquiring the exciting current of the isolation transformer and sending the acquired initial current data to the first signal conversion unit;
the first signal conversion unit is used for solving an absolute value of the initial current data to obtain the exciting current data.
3. The excitation control circuit according to claim 2, wherein the first signal conversion unit includes: the circuit comprises a first comparator, a first unidirectional conducting element, a second unidirectional conducting element, a first resistor and a second resistor;
a first input end of the first comparator is connected with a first end of the first resistor and a first end of the second resistor respectively, a second input end of the first comparator is grounded, and an output end of the first comparator is connected with a second end of the second resistor and an anode of the first one-way conduction element respectively;
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 the initial current data;
and the cathode of the second one-way conduction element is connected with the cathode of the first one-way conduction element, and the cathode of the second one-way conduction element is also used for outputting the excitation current data.
4. The excitation control circuit according to claim 1, wherein the excitation control output module includes: 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 and the second threshold according to the voltage of the reference voltage end and comparing the excitation current data with the first threshold and the second threshold; 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 excitation current data is not larger than the second threshold value, starting to continuously output a second intermediate signal until the excitation 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 comparison unit includes: the second comparator, the first capacitor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the third one-way conduction element;
a first input end of the second comparator is connected with a first end of the third resistor, a first end of the first capacitor and an anode of the third unidirectional conducting element respectively, a second input end of the second comparator is connected with a first end of the fourth resistor and a first end of the fifth resistor respectively, and an output end of the second comparator is connected with a first end of the sixth resistor and an output end of the comparison unit respectively;
the second end of the third resistor is connected with the first input end of the comparison unit; a second end of the fourth resistor is connected with a 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 conducting element is connected with the second end of the sixth resistor.
6. The excitation control circuit according to claim 5, wherein the second signal conversion unit includes: the fourth unidirectional conducting element, the seventh resistor, the eighth resistor, the ninth resistor, the second capacitor and the third capacitor;
the anode of the fourth unidirectional conducting element is 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 respectively, and the cathode of the fourth unidirectional conducting element is 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 respectively;
the second end of the seventh resistor is connected with a first power supply end; a second end of the ninth resistor is connected with a second power supply end;
and 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 according to claim 4, wherein the excitation control circuit further comprises: a reference voltage generating module; the reference voltage generating module includes: a third comparator, a tenth resistor, an eleventh resistor and a fourth capacitor;
a first input end of the third comparator is connected with a first end of the fourth capacitor, a first end of the tenth resistor and a first end of the eleventh resistor respectively, and a second input end and an output end of the third comparator are connected with the reference voltage end;
a second end of the tenth resistor is connected with a first power supply end;
a second terminal of the eleventh resistor and a second terminal of the fourth capacitor are both grounded.
8. The excitation control circuit according to any one of claims 1 to 7, further comprising: an AND gate;
the first input end of the AND gate is used for receiving the first control signal or the second control signal, the second input end of the AND gate is used for receiving the initial driving signal, and the output end of the AND gate is used for outputting a target driving signal;
the target drive signal is used to control the power supply of the isolation transformer.
9. A UPS comprising a main supply circuit, the isolation transformer and the excitation control circuit of any 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011147602.1A CN112421754B (en) | 2020-10-23 | 2020-10-23 | Excitation control circuit and UPS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011147602.1A CN112421754B (en) | 2020-10-23 | 2020-10-23 | Excitation control circuit and UPS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112421754A true CN112421754A (en) | 2021-02-26 |
| CN112421754B CN112421754B (en) | 2023-04-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2008271618A (en) * | 2007-04-16 | 2008-11-06 | Toshiba Mitsubishi-Electric Industrial System Corp | Uninterruptible power supply |
| 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 |
| CN105141209A (en) * | 2015-08-01 | 2015-12-09 | 漳州科华技术有限责任公司 | Method and device for reducing exciting current of transformer during bypass conduction of isolating uninterrupted power supply (UPS) |
| 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 |
| CN211046564U (en) * | 2019-12-23 | 2020-07-17 | 特富特科技(深圳)有限公司 | Power supply device |
-
2020
- 2020-10-23 CN CN202011147602.1A patent/CN112421754B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2008271618A (en) * | 2007-04-16 | 2008-11-06 | Toshiba Mitsubishi-Electric Industrial System Corp | Uninterruptible power supply |
| 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 |
| CN105141209A (en) * | 2015-08-01 | 2015-12-09 | 漳州科华技术有限责任公司 | Method and device for reducing exciting current of transformer during bypass conduction of isolating uninterrupted power supply (UPS) |
| WO2017020644A1 (en) * | 2015-08-01 | 2017-02-09 | 漳州科华技术有限责任公司 | Method and apparatus for reducing excitation current of transformer during bypass conducted by isolated ups |
| 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 |
| CN211046564U (en) * | 2019-12-23 | 2020-07-17 | 特富特科技(深圳)有限公司 | Power supply device |
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