CN204044223U - A kind of chain-type inverter current sensing means - Google Patents
A kind of chain-type inverter current sensing means Download PDFInfo
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Abstract
The utility model discloses a kind of chain-type inverter current sensing means, comprises current detector, inspection and transtation mission circuit, the first isolated form DC/DC module and the first cylinder manifold; First isolated form DC/DC model calling is to the primary power model of chain-type inverter and non-firm power module, for judging whether primary power model normally works, and when it cannot normally work, provide power supply by non-firm power module to the first cylinder manifold; The first input end IN1 of the first cylinder manifold is connected to primary power model, to receive the power supply from primary power model, second input end IN2 is connected to the first isolated form DC/DC module, to receive the power supply from the first isolated form DC/DC module, thus the electric energy that first input end IN1 or the second input end IN2 inputs is supplied to described inspection and transtation mission circuit.By this chain-type inverter current sensing means, the problem that the power supply solving current sensing device was lost efficacy, improves stability and the reliability of current measurement in chain-type inverter.
Description
Technical Field
The utility model relates to an electric power and electrical technology field, in particular to chain converter current detection device.
Background
The converter is a device which is composed of a single converter bridge or a plurality of converter bridges and performs alternating current and direct current conversion. The converter can be classified into a rectifier, which is a device for converting ac power into dc power, and an inverter, which is a device for converting dc power into ac power. Among the inverters, the chain-link converter has advantages such as a large number of levels, good harmonic characteristics, and easy realization, and thus is widely used in various high-voltage converter devices. The chain-type converter is also called as an H-bridge cascaded converter and consists of a plurality of link modules (also called as power modules), wherein each link module is a unidirectional H-bridge converter module, and the plurality of link modules are connected in series to be output to form the H-bridge cascaded converter.
Under a high-voltage application environment, the output voltage of the chain-type converter can reach 3 kv-35 kv, and under the voltage range, the measurement of the output current becomes very difficult. In chinese patent (CN101540496A), a chain converter output current measuring and protecting device is disclosed, which comprises a current sensor, an a/D converter and an overcurrent protector, a field programmable gate array chip, and an optical fiber driver and an isolation regulated power supply; the current sensor is used for measuring the output current of the chain type converter; the A/D converter is used for receiving the current measuring signal, converting the current measuring signal into a digital signal and receiving a control signal of the field programmable gate array chip at the same time, and the overcurrent protector compares the current measuring signal with an overcurrent protection setting signal and sends an overcurrent protection signal to the field programmable gate array chip; the field programmable gate array chip is used for receiving the current measurement digital signal and the overcurrent protection signal from the A/D converter and the overcurrent protector, coding and converting the signals into serial communication data signals, and sending the signals to the optical fiber driver; the optical fiber driver is used for converting the received serial communication data signal into an optical signal and sending the optical signal to an optical fiber; the isolation stabilized voltage supply is used for providing stabilized voltage supply for the current sensor, the A/D converter, the overcurrent protector, the field programmable gate array chip and the optical fiber driver.
Through the measuring and protecting device for the output current of the chain type converter, the voltage resistance problem of a current sensor is solved, high sampling and overcurrent protection are realized, and the requirement of implementing feedback control on the output current is met. However, the chain-link converter output current measuring and protecting device does not have a redundant power supply function, when a power module supplying power to the chain-link converter fails and is bypassed, the output voltage of the power module is gradually reduced, and finally the current measuring and protecting device cannot be supplied with power any more, so that the chain-link converter current sampling and measuring fails, and the reliability of the current measuring and protecting device is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a chain current converter current detection device for the power module of power supply breaks down among the solution prior art and leads to the problem of chain current converter current sampling and measurement inefficacy often.
In order to achieve the above object of the present invention, the present invention provides a current detection device for a chain-type converter, for detecting an output current of the chain-type converter, the current detection device for the chain-type converter comprises a current detector, an inspection and transmission circuit; the current detector is connected to the chain-link converter and is used for measuring the output current of the chain-link converter; the checking and sending circuit is connected with the current detector and used for generating an overcurrent protection signal according to a measured current signal and sending the current signal and the overcurrent protection signal, and the current detection device of the chain type converter further comprises a first isolation type DC/DC module and a first bus board;
the first isolation type DC/DC module is connected to a main power module and a standby power module of the chain type converter, judges whether the main power module normally works or not, and supplies power to the first bus board through the standby power module when judging that the main power module cannot normally work;
the first bus bar is provided with a first input end IN1, a second input end IN2 and an output end OUT, the first input end IN1 is connected to the main power module to receive power supply from the main power module, the second input end IN2 is connected to the first isolation type DC/DC module to receive power supply from the first isolation type DC/DC module, and the output end OUT of the first bus bar is connected to the checking and sending circuit, so that power input by the first input end IN1 or the second input end IN2 is supplied to the checking and sending circuit.
Preferably, the backup power module comprises a first backup power module;
the first isolated DC/DC module is provided with three terminals, namely an input terminal IN, an output terminal OUT and a feedback terminal FB; the input terminal IN is connected to a first standby power module of the chain-type converter and used for supplying power to the first isolated DC/DC module; the feedback terminal FB is connected to the main power module and used for detecting whether the main power module works normally; the output terminal OUT is connected to the second input terminal IN2 of the first bus board, and when the feedback terminal FB detects that the main power module has a fault, the output terminal OUT supplies the electric power input by the input terminal IN to the first bus board.
Preferably, when the feedback terminal FB detects that the main power module works normally, a low level is output at the output terminal OUT, so that the first bus bar receives power supply of the main power module;
when the feedback terminal FB detects that the main power module has a fault, a high level is output at the output terminal OUT, so that the first bus board receives the power supply of the first standby power module.
Preferably, the input end IN of the main power module is connected to the output end OUT of the first standby power module, and the input end IN of the first standby power module is connected to the output end OUT of the main power module;
a feedback terminal FB of the first isolation type DC/DC module is connected to an output end OUT of the main power module, and a first input end IN1 of the first bus bar is connected to the output end OUT of the main power module; an input terminal IN of the first isolated DC/DC module is connected to an output terminal OUT of the first backup power module.
Preferably, the first bus board comprises a diode D1 and a diode D2, an input terminal of the diode D1 is connected to the first input terminal IN1 of the first bus board, an input terminal of the diode D2 is connected to the second input terminal IN2 of the first bus board, and an output terminal of the diode D1 and the diode D2 are connected to the output terminal OUT of the first bus board, so as to supply power to the checking and transmitting circuit.
Preferably, the first isolation type DC/DC module comprises a controller K1, a capacitor C1, a transformer W1, an optocoupler G1, a diode D3, a capacitor C2, and a reference source G2; wherein,
the input end of the transformer W1 is connected IN series with the switch of the controller K1 and then connected to two ends of the input terminal IN of the first isolation type DC/DC module; the output end of the transformer W1 is rectified by a diode D3 and then is connected to the output terminal OUT of the first isolation type DC/DC module;
a capacitor C1 connected IN parallel across the input terminal IN, and a capacitor C2 connected IN parallel across the output terminal OUT; the reference source G2 is connected to the feedback terminal FB, the anode of the reference source G2 is connected to the control input end of the controller K1 through the optocoupler G1, and the cathode of the reference source G2 is connected to the output terminal OUT.
Preferably, the chain-link converter current detection device further comprises a second isolation type DC/DC module and a second bus plate; the backup power module further comprises a second backup power module, wherein,
the second isolation type DC/DC module is connected to the first standby power module and the second standby power module, judges whether the first standby power module works normally or not, and supplies power to the second bus board through the first standby power module when the first standby power module works normally; when the first standby power module is judged to be incapable of working normally, the second bus board is supplied with power through the second standby power module;
the first isolated DC/DC module is connected to the first standby power module through a second bus plate;
the second bus bar is provided with a first input end IN1, a second input end IN2 and an output end OUT, the first input end IN1 of the second bus bar is connected to the first standby power module, the second input end IN2 of the second bus bar is connected to the second isolated DC/DC module, and the output end OUT of the second bus bar is connected to the first isolated DC/DC module, so that the electric energy input by the first input end IN1 of the second bus bar or the second input end IN2 of the second bus bar is provided for the first isolated DC/DC module.
Preferably, the second isolated DC/DC module is provided with three terminals, which are an input terminal IN, an output terminal OUT, and a feedback terminal FB, respectively; wherein,
an input terminal IN of the second isolated DC/DC module is connected to a second standby power module of the chain-type converter and used for supplying power to the second isolated DC/DC module;
a feedback terminal FB of the second isolation type DC/DC module is connected to the first standby power module and is used for detecting whether the first standby power module works normally;
and the output terminal OUT of the second isolation type DC/DC module is connected to the second input end IN2 of the second junction box, and when the feedback terminal FB of the second isolation type DC/DC module detects that the first standby power module has a fault, the electric energy input by the input terminal IN of the second isolation type DC/DC module is supplied to the second junction box.
Preferably, the active power module is the power module closest to the current detector.
Preferably, the first standby power module is a power module adjacent to the active power module.
Preferably, the utility model provides a chain-link converter current detection device is high-pressure chain-link converter current detection device, is applied to high-pressure chain-link converter's current detection.
The beneficial effects of the utility model include:
the utility model provides an among the chain-type current converter current detection device, can provide the redundant power supply scheme of current detection unit, when the power module that provides the power supply for current detection and protection device goes wrong, can automatic switch-over to other stand-by power modules and provide the power supply for current measurement and protection device to the problem of the power supply inefficacy of current detection device among the high-voltage chain-type current converter has been solved, current measurement's stability and reliability among the chain-type current converter have been improved.
Drawings
Fig. 1 is a block diagram of a current detection device of a chain-type converter according to an embodiment of the present invention;
fig. 2A and 2B are schematic diagrams illustrating providing redundant power supply for the chain-link converter current detection device according to an embodiment of the present invention;
fig. 3 is a circuit configuration diagram of an exemplary first bus plate 30;
FIG. 4 is a circuit block diagram of an exemplary first isolated DC/DC module 40;
fig. 5 is a block diagram of another chain-link converter current detection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail the chain-type converter current detection device provided in the embodiments of the present invention with reference to the attached drawings.
The embodiment of the utility model provides a chain current converter current detection device is used for detecting chain current converter's electric current to realize the stable measurement and the reliable measurement of chain current converter electric current.
The embodiment of the utility model provides a chain converter current detection device for detect the output current of chain converter, chain converter current detection device includes current detector, inspection and sending circuit; the current detector is connected to the chain-link converter and is used for measuring the output current of the chain-link converter; the checking and sending circuit is connected with the current detector and used for generating an overcurrent protection signal according to a measured current signal and sending the current signal and the overcurrent protection signal, and the current detection device of the chain type converter further comprises a first isolation type DC/DC module and a first bus board; the first isolation type DC/DC module is connected to a main power module and a standby power module of the chain type converter, judges whether the main power module normally works or not, and supplies power to the first bus board through the standby power module when judging that the main power module cannot normally work; the first bus board is used for supplying power from the main power module or the first isolation type DC/DC module to the checking and transmitting circuit. When the chain-link converter comprises a plurality of standby power modules, the checking and transmitting circuit is powered by one of the standby power modules. The following description is made with reference to the accompanying drawings.
Fig. 1 is a block diagram of a current detection device of a chain-type converter according to an embodiment of the present invention. As shown in fig. 1, the chain-link converter current detection device includes a current detector 10, a checking and transmitting circuit 20; the current detector 10 is connected to a main power module 70 of the chain-link converter and is used for measuring the output current of the chain-link converter; the checking and transmitting circuit 20 is connected to the current detector 10, and configured to generate an overcurrent protection signal according to the measured current signal, and transmit the current signal and the overcurrent protection signal, where the standby power module includes a first standby power module 80. In order to provide power for the checking and transmitting circuit 20, the current detection device of the chain-type converter according to the embodiment of the present invention further includes a first isolation type DC/DC module 40 and a first bus plate 30; the first isolation type DC/DC module 40 is connected to the main power module 70 and the first standby power module 80 of the chain-type converter, and the first isolation type DC/DC module 40 determines whether the main power module 70 is working normally and supplies power to the first bus bar 30 when the main power module 70 cannot supply power, that is, the first isolation type DC/DC module 40 provides a connection channel between the first standby power module 80 and the first bus bar 30, so that the first standby power module 80 can supply power to the first bus bar 30; the first bus bar 30 is provided with a first input terminal IN1, a second input terminal IN2, and an output terminal OUT, the first input terminal IN1 is connected to the main power module 70 to receive power supplied from the main power module 70, the second input terminal IN2 is connected to the first isolated DC/DC module 40 to receive power supplied from the first isolated DC/DC module 40, and the output terminal OUT of the first bus bar 30 is connected to the checking and transmitting circuit 20 to supply power input from the first input terminal IN1 or the second input terminal IN2 to the checking and transmitting circuit 20.
The embodiment of the utility model provides an in, first cylinder manifold 30 can directly offer inspection and transmitting circuit 20 with the electric energy of mainly using power module 70, also can offer inspection and transmitting circuit 20 with the electric energy of first stand-by power module 80, wherein, the switching between mainly using power module 70 and the first stand-by power module 80 is accomplished by first isolated form DC/DC module 40, first isolated form DC/DC module 40 is when monitoring mainly using power module 70 by the bypass, give first cylinder manifold 30 with the electric energy transmission of first stand-by power module 80, and further offer inspection and transmitting circuit 20 through first cylinder manifold, thereby guarantee inspection and transmitting circuit 20's steady operation.
As described IN detail below with respect to the first isolated DC/DC module 40, as shown IN fig. 1, specifically, the first isolated DC/DC module 40 is provided with three terminals, namely, an input terminal IN, an output terminal OUT, and a feedback terminal FB; wherein the input terminal IN is connected to a first standby power module 80 of the chain-link converter for powering the first isolated DC/DC module 40; the feedback terminal FB is connected to the main power module 70, and is used for detecting the main power module 70; the output terminal OUT is connected to the second input terminal IN2 of the first bus bar 30, and when the feedback terminal FB detects a failure of the main power module 70, the power input from the input terminal IN is supplied to the first bus bar 30 through the output terminal OUT. When the feedback terminal FB detects that the main power module 70 works normally, a low level is output at the output terminal OUT, so that the first bus bar 30 receives power supply of the main power module 70; when the feedback terminal FB detects that the main power module 70 has a fault, a high level is output at the output terminal OUT, so that electric power is supplied to the first bus plate 30.
In the above example, the chain-link converter with N +1 type of redundant power supply is taken as an example for explanation, in the chain-link converter, in order to realize the redundant power supply, N +1 power modules are provided in the chain-link converter, when any one power module of the N +1 power modules fails, the chain-link converter can still normally operate, and when two or more power modules fail, the chain-link converter stops operating. IN the chain-link converter, the input of one power module is connected to the output of another power module, as shown IN fig. 1, the input terminal IN of the main power module 70 is connected to the output terminal OUT of the first standby power module 80, and the input terminal IN of the first standby power module 80 is connected to the output terminal OUT of the main power module 70. IN order to monitor whether the main power module 70 works normally, the feedback terminal FB of the first isolation type DC/DC module 40 is connected to the output terminal OUT of the main power module 70, and the first input terminal IN1 of the first bus board 30 is connected to the output terminal OUT of the main power module 70; the input terminal IN of the first isolated DC/DC module 40 is connected to the output terminal OUT of the first backup power module 80.
Please refer to fig. 2A and 2B, which are schematic diagrams illustrating redundant power supply for the chain-type converter current detecting device according to an embodiment of the present invention, wherein a power supply loop is illustrated by a thickened connection line, as shown IN fig. 2A, a power supply schematic diagram when the main power module 70 normally works, wherein the main power module 70 supplies power to the chain-type converter current detecting device through the first input terminal IN1 on the first bus plate 30, as shown IN fig. 2B, a power supply schematic diagram when the main power module 70 is failed and bypassed, and the first standby power module 80 inputs power through the first isolated DC/DC module 40 and further through the second input terminal IN2 on the first bus plate 30, so as to supply power to the chain-type converter current detecting device.
Referring to fig. 3, which is a circuit structure diagram of an exemplary first bus board 30, as shown IN fig. 3, the first bus board 30 includes a diode D1 and a diode D2, an input terminal of the diode D1 is connected to a first input terminal IN1 of the first bus board, an input terminal of the diode D2 is connected to a second input terminal IN2 of the first bus board, and an output terminal of the diode D1 and the diode D2 is connected to an output terminal OUT of the first bus board, so as to provide power for the checking and sending circuit 20. Wherein, the selection of the diode is according to voltage and power selection in this chain-link converter current detection device, and the diode of the low conduction voltage drop of the selection should be considered simultaneously, in the embodiment of the utility model, STPS10H100CG of ST company can be preferably adopted.
Referring to fig. 4, which is a circuit structure diagram of an exemplary first isolated DC/DC module 40, as shown in fig. 4, the first isolated DC/DC module 40 includes a controller K1, a capacitor C1, a transformer W1, an optical coupler G1, a diode D3, a capacitor C2, and a reference source G2; the input end of the transformer W1 is connected IN series with the switch of the controller K1 and then connected to two ends of the input terminal IN of the first isolated DC/DC module 40; the output end of the transformer W1 is rectified by a diode D3 and then connected to the output terminal OUT of the first isolated DC/DC module 40; a capacitor C1 connected IN parallel across the input terminal IN, and a capacitor C2 connected IN parallel across the output terminal OUT; the reference source G2 is connected to the feedback terminal FB, the anode of the reference source G2 is connected to the control input end of the controller K1 through the optocoupler G1, and the cathode of the reference source G2 is connected to the output terminal OUT.
The controller K1 is configured to adjust the output voltage of the output terminal OUT according to the magnitude of the feedback signal transmitted by the reference source G2, the transformer W1 is configured to adjust the magnitude of the ac voltage signal, the diode D3 is configured to rectify the ac voltage signal, so as to convert the converted ac voltage signal into a dc current signal and output the dc current signal, so as to provide a dc power source at the output terminal, and the capacitor C2 is configured to filter the dc current signal, so that the output voltage is more stable. The optical coupler G1 is used to realize the electrical isolation between the controller K1 and the feedback terminal FB, and because the voltages of the controller K1 and the feedback terminal FB are different, if the controller K1 and the feedback terminal FB are directly electrically connected, the voltage of one end will be mapped to the other end, and a current will be generated due to the voltage difference, thereby causing the possibility of damaging the device. The reference source G2 is used for acquiring a feedback signal and transmitting the feedback signal to the controller K1 through the optical coupler G1. The reference source G2 is specifically a voltage reference source, which is used as a reference for the output voltage of the active power module 70 (i.e. the voltage at the input terminal of the reference source G2), and the output voltage is divided and compared with the reference source G2, if the output voltage is greater than the reference value of the reference source G2, the controller K1 controls to decrease the output voltage value, otherwise, the controller K1 controls to increase the output voltage value, where the reference value is set according to the magnitude of the output voltage of the active power module 70, so as to determine whether the output voltage is normal.
To the utility model discloses the first isolated form DC/DC module that the embodiment provided, its topological form can be multiple, including topological modes such as forward, flyback, push-pull, half-bridge. In the embodiment of the utility model provides an in, adopt the topological mode of flyback. In order to realize complete isolation, feedback is isolated through an optical coupler device, wherein the optical coupler G1 can adopt a common linear optical coupler such as a PC817 and the like, and the reference source G2 can adopt a TL431 voltage reference chip of the company Ann. The controller K1 is a commonly used PWM power supply chip, for example, UCC2807 manufactured by TI can be used.
In the above example, the chain-type converter current detection device with N +1 type redundant power supply is taken as an example for explanation, the embodiment of the present invention provides a chain-type converter current detection device that can also be used in other chain-type converters, and the following application scenario of the chain-type converter with N +2 type redundant power supply is combined to explain another chain-type converter current detection device provided by the embodiment of the present invention. In the N +2 type chain type converter with redundant power supply, when one or two power modules have faults, the chain type converter can still work normally, and when more than two power modules have faults, the chain type converter stops working. For the current detection device of the chain-type converter provided in this embodiment, it is preferred to supply power to the checking and transmitting circuit 20 in the current detection device through the main power module, when the main power module fails, power is supplied to the checking and transmitting circuit 20 through the first standby power module 80, and when both the main power module and the first standby power module 80 fail and are bypassed, power is supplied to the checking and transmitting circuit 20 through the second standby power module 80.
Fig. 5 is a block diagram of another current detection device for a chain-link converter according to an embodiment of the present invention. On the basis of the chain-link converter current detection device provided by fig. 1, the chain-link converter current detection device further comprises a second isolation type DC/DC module 41 and a second bus plate 31; the standby power module further includes a second standby power module 82, wherein the second isolated DC/DC module 41 is connected to the first standby power module 80 and the second standby power module 82, the second isolated DC/DC module 40 determines whether the first standby power module 80 normally operates, and when it is determined that the first standby power module 80 normally operates, the first standby power module 80 supplies power to the second bus board; when the first standby power module 80 is judged to be incapable of working normally, the second bus board 31 is supplied with power through the second standby power module 82; the first isolation type DC/DC module 40 is connected to the first standby power module 80 through the second bus plate 31; the second bus bar 31 is provided with a first input end IN1, a second input end IN2 and an output end OUT, the first input end IN1 of the second bus bar 31 is connected to the first standby power module 80, the second input end IN2 of the second bus bar 31 is connected to the second isolated DC/DC module 41, and the output end OUT of the second bus bar 31 is connected to the first isolated DC/DC module 40, so that the electric energy input by the first input end IN1 or the second input end IN2 of the second bus bar 31 is provided for the first isolated DC/DC module 40.
IN a redundantly powered chain-link converter of the N +2 type, the connection between the power modules requires two sets of OUT and IN ports, as shown IN fig. 5, on each of which a first input IN1, a second input IN2, a first output OUT1 and a second output OUT2 are respectively provided. Wherein each set of OUT and IN ports of each power module is connected to a set of OUT and IN ports, respectively, of another power module.
IN the embodiment of the present invention, the second isolated DC/DC module 41 is provided with three terminals, i.e., an input terminal IN, an output terminal OUT, and a feedback terminal FB; wherein the input terminal IN of the second isolated DC/DC module 41 is connected to the second standby power module 82 of the chain-link converter for supplying power to the second isolated DC/DC module 41; a feedback terminal FB of the second isolation type DC/DC module 41 is connected to the first backup power module 80 for detecting the first backup power module 80; the output terminal OUT of the second isolated DC/DC module 41 is connected to the second input terminal IN2 of the second bus bar 31, and when the feedback terminal FB of the second isolated DC/DC module 41 detects that the first backup power module 80 has failed, the power input from the input terminal IN of the second isolated DC/DC module 41 is supplied to the second bus bar 31.
The first isolation type DC/DC module and the second isolation type DC/DC module can monitor the working state of the standby power module respectively and can also carry out effective electrical isolation, so that the stable operation and accurate measurement of the current detection device of the chain type converter are fully ensured.
In the embodiment of the present invention, preferably, the main power module 70 is the power module closest to the current detector 10, and the first standby power module 80 is the power module adjacent to the main power module 70. The second backup power module 82 is a power module adjacent to the first backup power module 80.
It should be noted that the circuit structures shown in fig. 2 and fig. 4 in the embodiment of the present invention are preferred implementations of modules in a power circuit, and equivalent transformation may be performed on the circuit structures of the modules or other circuit structures may be adopted on the premise of implementing the functions of the circuit modules.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A chain-link converter current detection device is used for detecting the output current of a chain-link converter and comprises a current detector and a checking and sending circuit; the current detector is connected to the chain-link converter and is used for measuring the output current of the chain-link converter; the checking and sending circuit is connected with the current detector and used for generating an overcurrent protection signal according to a measured current signal and sending the current signal and the overcurrent protection signal, and the current detection device of the chain type converter is characterized by further comprising a first isolation type DC/DC module and a first bus board;
the first isolation type DC/DC module is connected to a main power module and a standby power module of the chain type converter, judges whether the main power module normally works or not, and supplies power to the first bus board through the standby power module when judging that the main power module cannot normally work;
the first bus bar is provided with a first input end IN1, a second input end IN2 and an output end OUT, the first input end IN1 is connected to the main power module to receive power supply from the main power module, the second input end IN2 is connected to the first isolation type DC/DC module to receive power supply from the first isolation type DC/DC module, and the output end OUT of the first bus bar is connected to the checking and sending circuit, so that power input by the first input end IN1 or the second input end IN2 is supplied to the checking and sending circuit.
2. The chain-link converter current sensing device of claim 1, wherein the backup power module comprises a first backup power module;
the first isolated DC/DC module is provided with three terminals, namely an input terminal IN, an output terminal OUT and a feedback terminal FB; the input terminal IN is connected to a first standby power module of the chain-type converter and used for supplying power to the first isolated DC/DC module; the feedback terminal FB is connected to the main power module and used for detecting whether the main power module works normally; the output terminal OUT is connected to the second input terminal IN2 of the first bus board, and when the feedback terminal FB detects that the main power module has a fault, the output terminal OUT supplies the electric power input by the input terminal IN to the first bus board.
3. The chain-link converter current detecting device according to claim 2,
when the feedback terminal FB detects that the main power module works normally, a low level is output at the output terminal OUT, so that the first junction box receives the power supply of the main power module;
when the feedback terminal FB detects that the main power module has a fault, a high level is output at the output terminal OUT, so that the first bus board receives the power supply of the first standby power module.
4. The chain-link converter current detecting device according to claim 2,
the input end IN of the main power module is connected to the output end OUT of the first standby power module, and the input end IN of the first standby power module is connected to the output end OUT of the main power module;
a feedback terminal FB of the first isolation type DC/DC module is connected to an output end OUT of the main power module, and a first input end IN1 of the first bus bar is connected to the output end OUT of the main power module; an input terminal IN of the first isolated DC/DC module is connected to an output terminal OUT of the first backup power module.
5. The chain-link converter current detecting device of claim 1, wherein the first bus bar comprises a diode D1 and a diode D2, an input terminal of the diode D1 is connected to a first input terminal IN1 of the first bus bar, an input terminal of the diode D2 is connected to a second input terminal IN2 of the first bus bar, and an output terminal of the diode D1 and an output terminal of the diode D2 are connected to an output terminal OUT of the first bus bar, so as to supply power to the checking and transmitting circuit.
6. The chain-link converter current detection device according to claim 1, wherein the first isolated type DC/DC module comprises a controller K1, a capacitor C1, a transformer W1, an optical coupler G1, a diode D3, a capacitor C2 and a reference source G2; wherein,
the input end of the transformer W1 is connected IN series with the switch of the controller K1 and then connected to two ends of the input terminal IN of the first isolation type DC/DC module; the output end of the transformer W1 is rectified by a diode D3 and then is connected to the output terminal OUT of the first isolation type DC/DC module;
a capacitor C1 connected IN parallel across the input terminal IN, and a capacitor C2 connected IN parallel across the output terminal OUT; the reference source G2 is connected to the feedback terminal FB, the anode of the reference source G2 is connected to the control input end of the controller K1 through the optocoupler G1, and the cathode of the reference source G2 is connected to the output terminal OUT.
7. The chain-link converter current detecting device according to claim 1, wherein the chain-link converter current detecting device further comprises a second isolated type DC/DC module, and a second bus plate; the backup power module further comprises a second backup power module, wherein,
the second isolation type DC/DC module is connected to the first standby power module and the second standby power module, judges whether the first standby power module works normally or not, and supplies power to the second bus board through the first standby power module when the first standby power module works normally; when the first standby power module is judged to be incapable of working normally, the second bus board is supplied with power through the second standby power module;
the first isolated DC/DC module is connected to the first standby power module through a second bus plate;
the second bus bar is provided with a first input end IN1, a second input end IN2 and an output end OUT, the first input end IN1 of the second bus bar is connected to the first standby power module, the second input end IN2 of the second bus bar is connected to the second isolated DC/DC module, and the output end OUT of the second bus bar is connected to the first isolated DC/DC module, so that the electric energy input by the first input end IN1 of the second bus bar or the second input end IN2 of the second bus bar is provided for the first isolated DC/DC module.
8. The chain-link converter current detection device according to claim 7, wherein the second isolated DC/DC module is provided with three terminals, an input terminal IN, an output terminal OUT and a feedback terminal FB; wherein,
an input terminal IN of the second isolated DC/DC module is connected to a second standby power module of the chain-type converter and used for supplying power to the second isolated DC/DC module;
a feedback terminal FB of the second isolation type DC/DC module is connected to the first standby power module and is used for detecting whether the first standby power module works normally;
and the output terminal OUT of the second isolation type DC/DC module is connected to the second input end IN2 of the second junction box, and when the feedback terminal FB of the second isolation type DC/DC module detects that the first standby power module has a fault, the electric energy input by the input terminal IN of the second isolation type DC/DC module is supplied to the second junction box.
9. The chain-link converter current sensing device of claim 1, wherein the active power module is the closest power module to the current sensor.
10. The chain-link converter current sensing device of claim 2, wherein the first standby power module is a power module adjacent to the active power module.
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| CN201420403935.XU CN204044223U (en) | 2014-07-18 | 2014-07-18 | A kind of chain-type inverter current sensing means |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467231A (en) * | 2014-08-22 | 2016-04-06 | 比亚迪股份有限公司 | To-be-tested converter grid-connected test method and to-be-tested converter grid-connected test device |
| CN109613352A (en) * | 2018-11-26 | 2019-04-12 | 北京金风科创风电设备有限公司 | Method, device and system for life testing of power modules in converters |
| US11101740B2 (en) | 2016-12-16 | 2021-08-24 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
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2014
- 2014-07-18 CN CN201420403935.XU patent/CN204044223U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467231A (en) * | 2014-08-22 | 2016-04-06 | 比亚迪股份有限公司 | To-be-tested converter grid-connected test method and to-be-tested converter grid-connected test device |
| CN105467231B (en) * | 2014-08-22 | 2018-09-07 | 比亚迪股份有限公司 | The grid-connected test method and device of transverter to be measured |
| US11101740B2 (en) | 2016-12-16 | 2021-08-24 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
| US11183947B2 (en) | 2016-12-16 | 2021-11-23 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
| US11463016B2 (en) | 2016-12-16 | 2022-10-04 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
| CN109613352A (en) * | 2018-11-26 | 2019-04-12 | 北京金风科创风电设备有限公司 | Method, device and system for life testing of power modules in converters |
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