CN103311895A - Under-voltage protection device and system of converter control system - Google Patents
Under-voltage protection device and system of converter control system Download PDFInfo
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- CN103311895A CN103311895A CN2013102042377A CN201310204237A CN103311895A CN 103311895 A CN103311895 A CN 103311895A CN 2013102042377 A CN2013102042377 A CN 2013102042377A CN 201310204237 A CN201310204237 A CN 201310204237A CN 103311895 A CN103311895 A CN 103311895A
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Abstract
The invention provides an under-voltage protection device and a system of a converter control system; the device comprises a first energy accumulating unit, a second energy accumulating unit and an under-voltage protection unit; when the first energy accumulating unit is charged by an input power supply, and discharges and supplies power to a converter control unit; the second energy accumulating unit is charged by the input power supply, and discharges and supplies power to a switch tube driver; the under-voltage protection unit samples the voltage of the input power supply; and if the sampled voltage is less than first reference voltage, an under-voltage locking signal is sent to the converter control unit. We can know that when the first energy accumulating unit and the second energy accumulating unit discharge, the first energy accumulating unit supplies power to the converter control unit and the second energy accumulating unit supplies power to the switch tube driver, so that the converter control unit sends a correct blocking instruction and the switch tube driver correctly cuts off and protects an IGBT (insulated gate bipolar transistor) when the input power supply is under-voltage or loses power, and a converter safely exits a running state.
Description
Technical field
The present invention relates to the control field, especially relate to a kind of converter control system less voltage protector and system.
Background technology
Current transformer plays important effect in fields such as industrial frequency conversion field, photovoltaic generation, wind power generation and power converters.For example, traction convertor is called " heart " of locomotive, motor train unit as the traction power equipment of electric locomotive, is one of important symbol of weighing a national railway transportation equipment technical merit.Can traction convertor safe and highly efficient operation, is the key of the efficient operation of train safe.
Current transformer comprises converter module, current transformer control unit etc., and wherein converter module comprises switching tubes such as switching tube driver and IGBT, and the switching tube driver is used for driving switching tubes such as IGBT, and the current transformer control unit is used for current transformer is controlled.
Wherein, formed converter control system by the switching tube driver in current transformer control unit and the converter module, at present, give converter control system by special input power supply usually, i.e. the power supply of switching tube driver in current transformer control unit and the converter module.When this input power supply undesired (under voltage or dead electricity); can make current transformer control unit working state abnormal; thereby cause current transformer out of hand; simultaneously also can make the switching tube driver in the converter module can't drive IGBT switching tubes such as (insulated gate bipolar transistors); lose the ability of blocking brachium pontis, short circuit and overcurrent protection, and these safety of serious harm current transformer all.
For guaranteeing that current transformer can safe state out of service when the input power supply of converter control system is undesired; in the prior art; the current transformer control unit self has the function of under voltage locking; and the switching tube driver in the converter module has emergency power supply unit; when the input voltage that detects self when the current transformer control unit is under voltage or dead electricity; can start under voltage protection mechanism; be that the current transformer control unit is to switching tube driver transmission blocking instruction and the current transformer control unit self-operating protection mode of operation of converter module; the switching tube driver of converter module receives and carries out actions such as closing IGBT behind the blocking instruction, finally carries out actions such as closing IGBT by current transformer control unit running protection mode of operation and switching tube driver and makes the safe state out of service of current transformer.But, if import power supply under voltage or dead electricity this moment, can't keep the normal power supply of current transformer control unit, the current transformer control unit probably sends imperfect or wrong instruction, cause the switching tube driver in the converter module can not correctly carry out actions such as closing IGBT, thereby current transformer can not safe state out of service.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of converter control system less voltage protector and system; thereby can make that the input power supply at converter control system is the following time of situation of under voltage or dead electricity, guarantee that current transformer can safe state out of service.
For this reason, the technical scheme of technical solution problem of the present invention is:
The invention provides a kind of converter control system less voltage protector, described device comprises first energy-storage units, second energy-storage units and under voltage protection unit; Powered to the switching tube driver in current transformer control unit and the converter module by the input power supply;
When being used for charged state, described first energy-storage units by described input power source charges, powers to the current transformer control unit during discharge condition;
When being used for charged state, described second energy-storage units by described input power source charges, powers to the switching tube driver during discharge condition;
Described under voltage protection unit is used for the input power source voltage is sampled; and the voltage after will sampling and first reference voltage compare; if the voltage after the sampling is less than described first reference voltage; then send the under-voltage locking signal to described current transformer control unit, so that described current transformer control unit receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instruction to described switching tube driver.
Preferably, described device also comprises: first diode and second diode; Described first energy-storage units comprises first capacitance group and first resistance; Described input power supply has positive output end and negative output terminal;
The positive pole of described first diode connects the positive output end of input power supply, and the negative pole of first diode connects first end of first resistance and the negative pole of second diode; Second end of described first resistance connects first end of anodal and described first capacitance group of second diode, and second end of described first capacitance group connects the negative output terminal of input power supply; The negative pole of described second diode is connected to the current transformer control unit;
Described under voltage protection unit comprises for the input power source voltage is sampled: described under voltage protection unit is used for the voltage of the positive output end of input power supply is sampled.
Preferably, described first capacitance group is composed in parallel by at least one electrochemical capacitor, the positive pole of each electrochemical capacitor all connects the positive pole of described second diode in first capacitance group, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in first capacitance group.
Preferably, described device also comprises: the 3rd diode and the 4th diode; Described second energy-storage units comprises second capacitance group and second resistance; Described input power supply has positive output end and negative output terminal;
The positive pole of described the 3rd diode connects the positive output end of input power supply, and the negative pole of the 3rd diode connects first end of second resistance and the negative pole of the 4th diode; Second end of described second resistance connects first end of anodal and described second capacitance group of the 4th diode, and second end of described second capacitance group connects the negative output terminal of input power supply; The negative pole of described the 4th diode is connected to the switching tube driver;
Described under voltage protection unit comprises for the input power source voltage is sampled: described under voltage protection unit is used for the voltage of the positive output end of input power supply is sampled.
Preferably, described second capacitance group is composed in parallel by at least one electrochemical capacitor, the positive pole of each electrochemical capacitor all connects the positive pole of described the 4th diode in second capacitance group, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in second capacitance group.
Preferably, described under voltage protection unit comprises: voltage sample unit, voltage comparison unit, switching tube and relay; Described voltage sample unit is used for described input power source voltage is sampled, described voltage comparison unit is used for the voltage behind the described voltage sample unit sampling and first reference voltage are compared, if the voltage after the sampling is less than described first reference voltage, then voltage comparison unit transmit button pipe controls signal to described switching tube; Described switch controlled signal is used for the conducting state of the described switching tube of control;
Described relay and described switching tube are arranged in same loop, described relay is used for judging according to the conducting state of switching tube whether the transmit button pipe controls signal to described switching tube to described voltage comparison unit, if then send the under-voltage locking signal to described current transformer control unit.
Preferably, described input power supply has positive output end and negative output terminal;
Described voltage sample unit comprises the 3rd resistance and the 4th resistance; Be connected between the positive output end and negative output terminal of input power supply after described the 3rd resistance and the series connection of described the 4th resistance, the node between described the 3rd resistance and the 4th resistance is the output of described voltage sample unit.
Preferably, described input power supply has positive output end and negative output terminal;
Described voltage comparison unit comprises first voltage comparator, second voltage comparator, the 5th resistance, the 6th resistance and the 7th resistance; The first input end of described first voltage comparator is connected to the output of described voltage sample unit by the 5th resistance, and second input of described first voltage comparator connects first reference voltage; The first input end of described second voltage comparator connects the output of first voltage comparator by the 6th resistance, second input of described second voltage comparator connects second reference voltage, and the output of described second voltage comparator connects described switching tube by the 7th resistance.
Preferably, described switching tube is metal-oxide-semiconductor, and the output of described voltage comparison unit connects the grid of described metal-oxide-semiconductor; The control end of the source electrode of described metal-oxide-semiconductor and drain electrode, described relay is connected between the positive output end and negative output terminal of described input power supply, and the controlled terminal of described relay connects described current transformer control unit.
Preferably, described under voltage protection unit also comprises the 8th resistance and the light-emitting diode of series connection, when described light-emitting diode is used for described switching tube conducting, and described lumination of light emitting diode.
Preferably, described device also comprises the common mode filtering circuit, and described common mode filtering circuit is used for described input power source voltage is carried out exporting to behind the common mode filtering switching tube driver, first energy-storage units and second energy-storage units of current transformer control unit, converter module.
Preferably; described device also comprises surge protection circuit; described surge protection circuit is used for the voltage of common-mode filter output is carried out surge protection, and exports the voltage behind the surge protection in current transformer control unit, the converter module switching tube driver, first energy-storage units and second energy-storage units.
The present invention also provides a kind of converter control system under voltage protection system, and described under voltage protection system comprises switching tube driver and the above-mentioned any converter control system less voltage protector in input power supply, current transformer control unit, the converter module;
Described current transformer control unit and described switching tube driver are powered by described input power supply;
Described current transformer control unit receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instruction to described switching tube driver;
Described switching tube driver receives the switching tube that turn-offs behind the blocking instruction in the converter module.According to technique scheme as can be known; input power source voltage and first reference voltage after will sampling in the under voltage protection unit compare; voltage after sampling is less than first reference voltage; when just importing power supply and being under voltage or power failure state; then send the under-voltage locking signal to the current transformer control unit; the current transformer control unit learns that according to the under-voltage locking signal input power supply is under voltage or power failure state; this moment the running protection mode of operation, and the switching tube driver in converter module sends blocking instruction so that the switching tube driver is carried out the switching tubes such as IGBT that turn-off converter module after receiving blocking instruction.Simultaneously, when first energy-storage units and second energy-storage units are in charged state, by the input power source charges, and when first energy-storage units and second energy-storage units are in discharge condition, first energy-storage units is powered to the switching tube driver to the power supply of current transformer control unit and second energy-storage units, thereby so that when the input power supply is under voltage or dead electricity, there are enough electric energy to guarantee that the current transformer control unit sends correct blocking instruction, and have enough electric energy to guarantee that the switching tube driver in time turn-offs switching tubes such as IGBT when the blocking instruction that receives from the current transformer control unit, thereby make that current transformer is can safe state out of service under the situation of under voltage or dead electricity at the input power supply of current transformer control unit and switching tube driver.
Description of drawings
Fig. 1 is the structural representation of a specific embodiment of converter control system less voltage protector provided by the invention;
Fig. 2 is first energy-storage units and a kind of connected mode of importing power supply and current transformer control unit;
Fig. 3 is second energy-storage units and a kind of connected mode of importing power supply and switching tube driver;
Fig. 4 be first energy-storage units when being resistance and in parallel electrochemical capacitor with a kind of connected mode of input power supply and current transformer control unit;
Fig. 5 be second energy-storage units when being resistance and in parallel electrochemical capacitor with a kind of connected mode of input power supply and switching tube driver;
Fig. 6 is a kind of preferred construction schematic diagram of under voltage protection unit;
Fig. 7 is that a kind of physical circuit of under voltage protection unit shown in Figure 6 connects;
Fig. 8 is that the another kind of physical circuit of under voltage protection unit shown in Figure 6 connects;
Fig. 9 is the structural representation of another specific embodiment of converter control system less voltage protector provided by the invention;
Figure 10 is the structural representation of another specific embodiment of converter control system less voltage protector provided by the invention;
Figure 11 is the structural representation of common-mode filter and surge protection circuit in the specific embodiment shown in Figure 10;
Figure 12 is the structural representation of the specific embodiment of converter control system under voltage protection provided by the invention system.
Embodiment
See also Fig. 1, the invention provides a kind of specific embodiment of converter control system less voltage protector, among this embodiment, described device comprises first energy-storage units 101, second energy-storage units 102 and under voltage protection unit 103.
Powered to the switching tube driver 106 in current transformer control unit 105 and the converter module by input power supply 104.Wherein, the input power supply can be to power by the electric power source pair of module switching tube driver in the converter module.The input power supply is the power supply of powering to converter control system to specially.
First energy-storage units 101 is used for when charged state by 104 chargings of input power supply, when discharge condition, to 105 power supplies of current transformer control unit, so that being provided, enough electric energy guarantee that current transformer control unit 105 can send correct blocking instruction to switching tube driver 106.Particularly, when the input power supply was normal condition, first energy-storage units 101 was in the charging poised state, and when the input power supply was under voltage or power failure state, first energy-storage units 101 was in discharge condition.First energy-storage units 101 specifically can be made up of electric capacity and resistance for having the circuit of energy-storage function.
Second energy-storage units 102 is used for when charged state by 104 chargings of input power supply, when discharge condition, to 106 power supplies of switching tube driver, so that being provided, enough electric energy guarantee the switching tubes such as IGBT that switching tube driver 106 can in time turn-off in the converter module after receiving blocking instruction.Particularly, when the input power supply was normal condition, second energy-storage units was in the charging poised state, and when the input power supply was under voltage or power failure state, second energy-storage units was in discharge condition.Second energy-storage units 102 specifically can be made up of electric capacity and resistance for having the circuit of energy-storage function.
In general; (the 40ms for example that needs the certain protection time during current transformer control unit running protection mode of operation; hereinafter to be referred as " guard time "), then first energy-storage units 101 and second energy-storage units 102 need have enough capacitances to make current transformer control unit 105 and switching tube driver 106 in guard time (for example in the time of 40ms) can keep operate as normal.
Under voltage protection unit 103 is used for the voltage of input power supply 104 is sampled; and the voltage after will sampling and first reference voltage compare; if the voltage after the sampling is less than described first reference voltage; judge and import power source voltage and be under voltage or power failure state this moment; then send the under-voltage locking signal to described current transformer control unit 105, so that described current transformer control unit 105 receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instructions to described switching tube driver 106.After receiving blocking instruction, can carry out switching tube driver 106 actions such as closing IGBT to realize that converter module is blocked protection.Here, whether first reference voltage is the nominal voltage of under voltage or power failure state for the magnitude of voltage of demarcating after the input power supply is sampled.Especially; the voltage that under voltage protection unit 103 can also be used for after sampling is not less than described first reference voltage; import power source voltage and be in normal condition this moment; then send the voltage normal signal to described current transformer control unit 105, so that described current transformer control unit 105 starts normal mode of operation and sends the deblocking instruction to described switching tube driver 106 after receiving described voltage normal signal.Switching tube driver 106 starts normal mode of operation after switching tube driver 106 receives the deblocking instruction, namely carries out actions such as opening IGBT.
Here what deserves to be explained is; and in the prior art; the input voltage that the under voltage lock function that the current transformer control unit has self can only realize detecting self is under voltage or dead electricity; and can directly sample to the input power supply in the under voltage protection unit 103 in the embodiment of the invention; also can be to sampling with the idiostatic sampled point of input power supply; and the sampled point of the 103 pairs of inputs under voltage protection unit power supply can not be positioned on the discharge paths of first energy-storage units; thereby guarantee the real voltage that is sampled as the input power supply of under voltage protection unit; rather than the discharge voltage of first energy-storage units, thereby judge accurately whether the input power supply is under voltage or power failure state.
According to technique scheme as can be known; input power source voltage and first reference voltage after will sampling under voltage protection unit 103 compare; voltage after sampling is less than first reference voltage; when just importing power supply 104 and being under voltage or power failure state; then send the under-voltage locking signal to current transformer control unit 105; current transformer control unit 105 learns that according to the under-voltage locking signal input power supply is under voltage or power failure state; this moment, the running protection mode of operation and sent blocking instructions so that the switching tube driver is carried out the switching tubes such as IGBT that turn-off converter module to switching tube driver 106.Simultaneously, when first energy-storage units 101 and second energy-storage units 102 are in charged state, by 104 chargings of input power supply, when first energy-storage units 101 and second energy-storage units 102 are in discharge condition, first energy-storage units 101 is powered to switching tube driver 106 to 105 power supplies of current transformer control unit and second energy-storage units 102, when input power supply 104 is under voltage or power failure state, when namely the voltage after the sampling is less than first reference voltage, first energy-storage units and second energy-storage units are in discharge condition, thereby so that there are enough electric energy to guarantee that current transformer control unit 105 sends correct blocking instruction, thereby and have enough electric energy to guarantee that switching tube driver 106 carries out actions such as closing IGBT when receiving blocking instruction, thereby make and when the input power supply of converter control system is under voltage or power failure state, can control current transformer safety state out of service.
Introduce the connected mode of first energy-storage units and second energy-storage units and input power supply when the input power supply has positive and negative two outputs below respectively.
As shown in Figure 2, the input power supply can have two outputs, i.e. positive output end and negative output terminal.Converter control system less voltage protector among the embodiment at this moment shown in Figure 1 can also comprise: diode D1 and diode D2.First energy-storage units comprises first capacitance group 201 and resistance R 1.Wherein, the positive pole of diode D1 connects the positive output end of input power supply 104, the negative pole of diode D1 connects first end of resistance R 1 and the negative pole of diode D2, second end of resistance R 1 connects first end of anodal and first capacitance group 201 of diode D2, second end of first capacitance group 201 connects the negative output terminal of input power supply 104, and the negative pole of diode D1 is connected to current transformer control unit 105.When input power supply under voltage or power failure state, the capacitance of first capacitance group 201 has guaranteed that current transformer control unit 105 has enough electric energy running protection mode of operations and sends correct blocking instruction to switching tube driver 106.Wherein, resistance R 1 is the charging resistor of first capacitance group 201, and the electric current when being used for restriction and giving 201 chargings of first capacitance group is not if having resistance R 1 then can cause charging current excessive and burn out first capacitance group 201.Resistance R 1 can also one or more resistance in parallel.The resistance of resistance R 1 and the quantity of parallel resistor and resistance charging current size according to the actual requirements determines.As can be seen, in structure shown in Figure 2, when importing power supply just often, the input power supply is directly powered to the current transformer control unit by diode D1, and charge to first capacitance group 201 by diode D1 and resistance R 1, when the input power supply was under voltage or power failure state, first capacitance group 201 was powered to the current transformer control unit by diode D2.Limited the flow direction of electric current by diode D1 and D2.First capacitance group 201 can be made up of the electric capacity of a plurality of parallel connections, and all right resistance in parallel of first capacitance group this moment is as discharge resistance.
Then under voltage protection unit 103 comprises for the input power source voltage is sampled: under voltage protection unit 103 is used for the voltage of the positive output end of input power supply is sampled.
As shown in Figure 3, the input power supply can have two outputs, i.e. positive output end and negative output terminal.Converter control system less voltage protector among the embodiment at this moment shown in Figure 1 can also comprise: diode D3 and diode D4.Second energy-storage units comprises second capacitance group 202 and resistance R 2.Wherein, the positive pole of diode D3 connects the positive output end of input power supply 104, the negative pole of diode D3 connects first end of resistance R 2 and the negative pole of diode D4, second end of resistance R 2 connects first end of anodal and second capacitance group 202 of diode D4, second end of second capacitance group 202 connects the negative output terminal of input power supply 104, and the negative pole of diode D4 is connected to the switching tube driver 106 in the converter module.When input power supply under voltage or power failure state, the capacitance of second capacitance group 202 has guaranteed have enough electric energy to carry out the action of closing switching tubes such as IGBT after switching tube driver 106 receives blocking instruction.Wherein, resistance R 2 is charging resistors of second capacitance group 202, and the electric current when being used for restriction and giving 202 chargings of second capacitance group is not if having resistance R 2 then can cause charging current excessive and burn out second capacitance group 202.Resistance R 2 can also one or more resistance in parallel.The resistance of resistance R 2 and the quantity of parallel resistor and resistance charging current size according to the actual requirements determines.As can be seen, in structure shown in Figure 3, when importing power supply just often, the input power supply is directly powered to the switching tube driver by diode D3, and charge to second capacitance group 202 by diode D3 and resistance R 2, when the input power supply was under voltage or power failure state, second capacitance group 202 was powered to the switching tube driver by diode D4.Limited the flow direction of electric current by diode D3 and D4.Second capacitance group 202 can be made up of the electric capacity of a plurality of parallel connections.
Then under voltage protection unit 103 comprises for the input power source voltage is sampled: under voltage protection unit 103 is used for the voltage of input power supply positive output end is sampled.
Wherein, especially, first capacitance group 201 among Fig. 2 is composed in parallel by at least one electrochemical capacitor, and the positive pole of each electrochemical capacitor all connects the positive pole of diode D2 in this moment first capacitance group 201, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in first capacitance group 201.For example shown in Figure 4, first capacitance group is composed in parallel by 6 electrochemical capacitors, wherein the positive pole of each electrochemical capacitor all connects the positive pole of diode D2, the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply, as shown in Figure 4, all right parallel resistance R9 of first capacitance group is as discharge resistance.The appearance value of first capacitance group can be 1800uF, and the power that can be implemented in the input power supply 104 of converter control system is under the situation of 260W, keeps the operating time about current transformer control unit 200ms.Second capacitance group among Fig. 3 also can be composed in parallel by at least one electrochemical capacitor, the positive pole of each electrochemical capacitor all connects the positive pole of diode D4 in this moment second capacitance group, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in second capacitance group.For example shown in Figure 5, second capacitance group is composed in parallel by 6 electrochemical capacitors, wherein the positive pole of each electrochemical capacitor all connects the positive pole of diode D4 in second capacitance group, the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in second capacitance group, as shown in Figure 4, all right parallel resistance R10 of second capacitance group is as discharge resistance.
Particularly, as shown in Figure 6, under voltage protection unit 103 can comprise: voltage sample unit 1031, voltage comparison unit 1032, switching tube 1033 and relay 1034.Voltage sample unit 1031 is used for the voltage of input power supply 104 is sampled, voltage comparison unit 1032 is used for voltage and first reference voltage after 1031 samplings of voltage sample unit are compared, if the voltage after the sampling is less than described first reference voltage, illustrate and import power supply and be under voltage or power failure state this moment, then voltage comparison unit 1032 transmit button pipes control signal to described switching tube 1033, the switch controlled signal is used for the conducting state of the described switching tube 1033 of control, namely is conducting or shutoff.Relay 1034 is arranged in same closed-loop path with switching tube 1033, relay 1034 is used for judging according to the conducting state of switching tube 1033 whether the transmit button pipe controls signal to described switching tube 1033 to described voltage comparison unit, if then send the under-voltage locking signal to described current transformer control unit 105.
In under voltage protection unit 103, because voltage comparison unit 1032 can control signal to switching tube 1033 by the transmit button pipe, so the output of voltage comparison unit 1032 connects the control end of switching tube 1033.Switching tube 1033 is connected in the same circuit with the control end of relay 1034.That is to say, the conducting state of the voltage after voltage comparison unit 1032 can be sampled by voltage sample unit 1031 and the comparative result control switch pipe of first reference voltage, and the conducting state of switching tube 1033 can control relay 1034 the conducting state of control end, thereby the conducting state of the controlled terminal of control relay 1034.Can send the under-voltage locking signal to current transformer control unit 105 according to relay 1034, current transformer control unit 105 judges whether to receive the under-voltage locking signal by the conducting state of the controlled terminal of detection relay 1034 as can be known.For example, voltage after voltage comparison unit 1032 compares voltage sample unit 1031 sampling is during less than first reference voltage, then control switch pipe 1033 disconnects, switching tube 1033 is connected in the same loop with the control end of relay 1034, this moment, the control end of relay 1034 did not have electric current to pass through, the controlled terminal of relay 1034 opens circuit, when current transformer control unit 105 detects the off state of controlled terminal of relay 1034, then think to have received the under-voltage locking signal, importing power supply this moment as can be known is under voltage or power failure state.
Introduce the concrete structure of voltage sample unit 1031 in the under voltage protection unit shown in Figure 6, voltage comparison unit 1032, switching tube 1033 below respectively.
The concrete structure of voltage sample unit 1031 can comprise as shown in Figure 7: resistance R 3 and resistance R 4.And the input power supply has two outputs, i.e. positive output end and negative output terminal.Wherein, be connected between the positive output end and negative output terminal of input power supply 104 after resistance R 3 and resistance R 4 series connection, the intermediate node of resistance R 3 and resistance R 4 is as the output of voltage sample unit.Magnitude of voltage V behind this moment voltage sample unit sampling, namely the magnitude of voltage of the output of voltage sample unit is:
U wherein
DCDc voltage value for the input power supply.Can be by the magnitude of voltage and the ratio of importing power source voltage after the R3 resistance different with R4 realizes the sampling of regulation voltage sampling unit be set.Here, voltage sample unit 1031 can also adopt other structure, only need have and can the function that voltage is sampled be got final product.
The concrete structure of voltage comparison unit 1032 can comprise as shown in Figure 7: resistance R 5, resistance R 6, resistance R 7, the first voltage comparator AMP1 and the second voltage comparator AMP2.Wherein, the in-phase input end of the first voltage comparator AMP1 is connected to the output of voltage sample unit 1031 by resistance R 5, what deserves to be explained is, this moment, the voltage sample unit can be other structures beyond Fig. 7 or Fig. 7.The inverting input of the first voltage comparator AMP1 connects first reference voltage, and the output of the first voltage comparator AMP1 connects the in-phase input end of the second voltage comparator AMP2 by resistance R 6.The output of the first voltage comparator AMP1 connects the in-phase input end of the second voltage comparator AMP2 by resistance R 6, the inverting input of the second voltage comparator AMP2 connects second reference voltage, and the output of the second voltage comparator AMP2 connects switching tube by resistance R 7.Wherein, during greater than the voltage of reversed-phase output, the magnitude of voltage of output is greater than second reference voltage at the voltage of in-phase input end for the first voltage comparator AMP1.During less than the voltage of reversed-phase output, the magnitude of voltage of output is less than second reference voltage at the voltage of in-phase input end for the first voltage comparator AMP1.
Therefore, when the magnitude of voltage of the in-phase input end of the first voltage comparator AMP1 during greater than the magnitude of voltage of inverting input, import power supply this moment is normal condition, the first voltage comparator AMP1 exports high level, the magnitude of voltage of this high level is greater than second reference voltage, and therefore the second voltage comparator AMP2 exports high level.When the magnitude of voltage of the in-phase input end of the first voltage comparator AMP1 during less than the magnitude of voltage of inverting input, import power supply this moment is under voltage or power failure state, the first voltage comparator AMP1 output low level, this low level magnitude of voltage is less than second reference voltage, so the second voltage comparator AMP2 output low level.
In fact, first voltage comparator also can be the output that is connected first reference voltage and inverting input connection voltage sample unit by in-phase input end, second voltage comparator also can be to connect second reference voltage and inverting input connection resistance R 6 by in-phase input end, and the present invention does not add restriction to this.Wherein, first reference voltage can be provided by a resistance series connection bleeder circuit, and second reference voltage can be provided by three ends parallel voltage-stabilizing diode able to programme.Resistance R 5 is input pickup resistances of the first voltage comparator AMP1, and resistance R 6 is the input pickup resistance of the second voltage comparator AMP2 and the output resistance of the first voltage comparator AMP1.In addition, first voltage comparator and second voltage comparator shown in Figure 7 can be made up of amplifier, and this moment, response speed was very fast, can reach the microsecond rank usually.
As can be seen, the voltage comparison unit among Fig. 7 has adopted two-layer configuration, has higher stability and gain amplifier multiple than primary structure, and ability anti-interference and that inhibition output is saturated is stronger.And in actual applications, voltage comparison unit adopts the above structure of two-stage usually, and the present invention does not limit this.
Switching tube 1033 can have the device of switching function for metal-oxide-semiconductor, triode etc.For example shown in Figure 7, switching tube 1033 is metal-oxide-semiconductor M1, the grid of metal-oxide-semiconductor M1 connects the output of voltage comparison unit 1032, the source electrode of metal-oxide-semiconductor M1 and drain electrode are connected between the negative output terminal of first end of control end of relay and input power supply, and this moment, second end of control end of relay 1034 connected the positive output end of input power supply 104.The control end that in fact, only need satisfy the source electrode of metal-oxide-semiconductor M1 and drain electrode and relay is connected between the positive output end of input power supply and the negative output terminal and gets final product.Here, the controlled terminal of relay connects current transformer control unit 105.
Preferably; can also under voltage protection unit 103 shown in Figure 6, connect a resistance and light-emitting diode; and when the switching tube conducting; thereby it is luminous that light-emitting diode is also connected; thereby can learn the conducting state of switching tube according to the luminous situation of light-emitting diode, learn further whether the input power supply is under voltage or power failure state.For example shown in Figure 8, series resistance R8 and light-emitting diode D5 in the loop of the positive output end of the control end of relay, metal-oxide-semiconductor M1 and input power supply and negative output terminal, then as can be seen, when the voltage after voltage sample unit 1031 sampling during greater than first reference voltage, the second voltage comparator AMP2 exports high level, metal-oxide-semiconductor M1 conducting, this moment, diode D5 was luminous.When the voltage after voltage sample unit 1031 sampling during less than first reference voltage, the second voltage comparator AMP2 output low level, metal-oxide-semiconductor M1 turn-offs, and this moment, diode D5 was not luminous.
Converter control system less voltage protector among the present invention; can be used in traction convertor, industrial frequency transformer and the multiple systems such as frequency converter module, photovoltaic generator, wind-driven generator, electric automobile and power converter, the present invention is not limited this.
Introduce a preferred embodiment of a converter control system less voltage protector provided by the invention below.In this preferred embodiment, be that example is illustrated with the traction convertor.In traction convertor, the current transformer control unit is specially the traction control unit, and the switching tube driver specifically is the IGBT driver.
See also Fig. 9; the present invention also provides another specific embodiment of converter control system less voltage protector; among this embodiment, described device comprises first energy-storage units 101, second energy-storage units 102, under voltage protection unit 103, diode D1, diode D2, diode D3 and diode D4.The input power supply has two outputs, i.e. positive output end and negative output terminal.Described device is used for traction convertor.
Powered to the IGBT driver 902 in traction control unit 901 and the converter module by input power supply 104.
As shown in Figure 4, first energy-storage units 101 comprises first capacitance group and resistance R 1, resistance R 9.First capacitance group comprises the electrochemical capacitor of 6 parallel connections.Wherein the positive pole of each electrochemical capacitor all connects the positive pole of diode D2, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply 104.The positive pole of diode D1 connects the positive output end of input power supply 104, and the negative pole of diode D1 connects first end of resistance R 1 and the negative pole of diode D2, and second end of resistance R 1 connects the positive pole of diode D2, and the negative pole of diode D1 is connected to traction control unit 901.Resistance R 9 is in parallel with each electrochemical capacitor in first capacitance group.
As shown in Figure 5, second energy-storage units 102 comprises that second capacitance group and resistance R 2, resistance R 10, the second capacitance group comprise 6 electrochemical capacitors in parallel.Wherein the positive pole of each electrochemical capacitor all connects the positive pole of diode D4, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply.The positive pole of diode D3 connects the positive output end of input power supply 104, the negative pole of diode D3 connects first end of resistance R 2 and the negative pole of diode D4, second end of resistance R 2 connects the positive pole of diode D4, and the negative pole of diode D4 is connected to the IGBT driver 902 in the converter module.Resistance R 10 is in parallel with each electrochemical capacitor in second capacitance group.
As shown in Figure 8, under voltage protection unit 103 comprises: voltage sample unit and voltage comparison unit, metal-oxide-semiconductor M1, relay 1034, light-emitting diode D5 and resistance R 8.The voltage sample unit comprises that resistance R 3 and resistance R 4, voltage comparison unit comprise resistance R 5, resistance R 6, resistance R 7, the first voltage comparator AMP1 and the second voltage comparator AMP2.
Wherein, be connected between the positive output end and negative output terminal of input power supply 104 after resistance R 3 and resistance R 4 series connection, the in-phase input end of the first voltage comparator AMP1 is connected between resistance R 3 and the resistance R 4 by resistance R 5, the inverting input of the first voltage comparator AMP1 connects first reference voltage of 2.5V, the output of first voltage comparator connects first end of resistance R 6, second end of resistance R 6 connects the in-phase input end of the second voltage comparator AMP2, the inverting input of the second voltage comparator AMP2 inserts second reference voltage of 10V, and the output of the second voltage comparator AMP2 connects the grid of metal-oxide-semiconductor M1 by resistance R 7.Between the source electrode of the control end of relay 1034, metal-oxide-semiconductor M1 and the drain electrode, positive output end and the negative output terminal of resistance R 8, light-emitting diode D5 and input power supply form a closed-loop path.The controlled terminal of relay 1034 links to each other with the traction control unit.
When the voltage of the in-phase input end of the first voltage comparator AMP1 during less than first reference voltage; the low level of first voltage comparator output 0V; the second voltage comparator output low level then; metal-oxide-semiconductor M1 disconnects; therefore the control end of relay opens circuit; the controlled terminal of relay also opens circuit, when the controlled terminal that traction control unit 901 detects relay 1034 opens circuit, and running protection mode of operation and send blocking instructions to described IGBT driver 902 then.After receiving blocking instruction, can carry out IGBT driver 902 actions such as closing IGBT to realize that converter module is blocked protection.When the voltage of the in-phase input end of the first voltage comparator AMP1 during greater than first reference voltage, the high level of first voltage comparator output 15V, then second voltage comparator is exported high level, metal-oxide-semiconductor M1 closure, so control end closure of relay, the controlled terminal of relay is also closed, and when traction control unit 901 detected the controlled terminal closure of relay 1034, traction control unit 901 started normal mode of operation and sends the deblockings instruction to described IGBT driver 902.The IGBT driver receives deblocking instruction back and starts normal mode of operation.
In fact, in converter control system less voltage protector provided by the invention, can add filtering or surge protection circuit at the output of input power supply usually the input power source voltage is carried out filtering or surge protection.Be illustrated below by an embodiment.Still be illustrated with traction convertor in the following examples.
Figure 10 is another specific embodiment of converter control system less voltage protector provided by the invention; among this embodiment, described device comprises first energy-storage units 101, second energy-storage units 102, under voltage protection unit 103, common-mode filter 1001 and surge protection circuit 1002.Described device is used for traction convertor.
Common-mode filter 1001 is used for the voltage of input power supply 104 outputs is carried out exporting surge protection circuit 1002 to behind the common mode filtering; surge protection circuit 1002 is used for the voltage behind the common mode filtering of common-mode filter 1001 outputs is carried out surge protection, and exports the voltage behind the surge protection to traction control unit 901, IGBT driver 902, first energy-storage units 101 and second energy-storage units 102.
First energy-storage units 101 is used for when charged state by the voltage charging of input power supply 104 behind common-mode filter and surge protection circuit; 901 power supplies to the traction control unit when discharge condition guarantee that so that enough electric energy to be provided the traction control unit can send correct blocking instruction to the IGBT driver.
Second energy-storage units 102 is used for when charged state by the voltage charging of input power supply 104 behind common-mode filter and surge protection circuit; when discharge condition, to 902 power supplies of IGBT driver, so that being provided, enough electric energy assurance IGBT drivers can after receiving blocking instruction, carry out actions such as closing IGBT.
Under voltage protection unit 103 is used for the voltage of input power supply 104 behind common-mode filter and surge protection circuit is sampled; and the voltage after will sampling and first reference voltage compare; if the voltage after the sampling is less than described first reference voltage; import power source voltage and be under voltage or power failure state this moment; then send the under-voltage locking signal to described traction control unit 901, so that described traction control unit 901 receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instructions to described IGBT driver 902.After receiving blocking instruction, can carry out IGBT driver 902 actions such as closing IGBT to realize that converter module is blocked protection.
The structure of common-mode filter 1001 and surge protection circuit 1002 can be as shown in figure 11, and common-mode filter 1001 is made up of two common mode inductances on magnetosphere and metal shell.Surge protection circuit 1002 can be made up of piezo-resistance R9, R10 and R11; wherein; be connected between two outputs of common-mode filter after piezo-resistance R9 and the R10 series connection; the intermediate node ground connection of R9 and R10 and connecing on the shell of common-mode filter; piezo-resistance R11 is connected between two outputs of common-mode filter; in parallel with the series circuit of R9 and R10, the resistance of R9 and R10 equates.When the input voltage of surge protection circuit was overvoltage surge, the resistance of piezo-resistance R9, R10 and R11 reduced, and overvoltage surge releases energy by R9, R10 and R11, thereby had protected late-class circuit.Common-mode filter 1001 and surge protection circuit 1002 can also adopt other structure, and for example, surge protection circuit 1002 can also be protective tube or transition diode.Here, can not have surge protection circuit yet, and have only common-mode filter.Then export traction control unit 901, IGBT driver 902, first energy-storage units 101 and second energy-storage units 102 to by the voltage of common-mode filter after with common mode filtering this moment.
See also Figure 12; the present invention also provides the specific embodiment of a kind of converter control system under voltage protection system, and described under voltage protection system comprises the switching tube driver 106 in converter control system less voltage protector 1201, input power supply 104, current transformer control unit 105 and the converter module.
Wherein, converter control system less voltage protector 1201 comprises first energy-storage units 101, second energy-storage units 102 and under voltage protection unit 103 as shown in Figure 1.
First energy-storage units 101 is used for being charged by input power supply 104 when charged state, to 105 power supplies of current transformer control unit, guarantees that so that enough electric energy to be provided the current transformer control unit can send correct blocking instruction to the switching tube driver when discharge condition.Particularly, when the input power supply was under voltage or power failure state, first energy-storage units 101 was in discharge condition, and when the input power supply was normal condition, first energy-storage units 101 was in the charging poised state.
Second energy-storage units 102 is used for when charged state by 104 chargings of input power supply; when discharge condition, to 106 power supplies of switching tube driver, so that being provided, enough electric energy assurance switching tube drivers can after receiving blocking instruction, carry out actions such as closing IGBT to be protected by correct the blockade.Particularly, when the input power supply was under voltage or power failure state, second energy-storage units 102 was in discharge condition, and when the input power supply was normal condition, second energy-storage units 102 was in the charging poised state.
Under voltage protection unit 103 is used for the voltage of input power supply 104 is sampled; and the voltage after will sampling and first reference voltage compare; if the voltage after the sampling is less than described first reference voltage; import power source voltage and be under voltage or power failure state this moment; then send the under-voltage locking signal to described current transformer control unit 105, so that described current transformer control unit 105 receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instructions to described switching tube driver 106.
Current transformer control unit 105 receives behind the under-voltage locking signal running protection mode of operation and sends blocking instructions to switching tube driver 106.
After switching tube driver 106 receives blocking instruction, can carry out the switching tubes such as IGBT of closing in the converter module and be blocked protection with the realization converter module.Here, whether first reference voltage is the nominal voltage of under voltage or power failure state for the magnitude of voltage of demarcating after input voltage is sampled.
Current transformer control unit 105 and switching tube driver 106 are by 104 power supplies of input power supply.
Converter control system less voltage protector 1201 in the present embodiment can also be any one specific embodiment of converter control system less voltage protector provided by the invention.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (13)
1. a converter control system less voltage protector is characterized in that, described device comprises first energy-storage units, second energy-storage units and under voltage protection unit; Powered to the switching tube driver in current transformer control unit and the converter module by the input power supply;
When being used for charged state, described first energy-storage units by described input power source charges, powers to the current transformer control unit during discharge condition;
When being used for charged state, described second energy-storage units by described input power source charges, powers to the switching tube driver during discharge condition;
Described under voltage protection unit is used for the input power source voltage is sampled; and the voltage after will sampling and first reference voltage compare; if the voltage after the sampling is less than described first reference voltage; then send the under-voltage locking signal to described current transformer control unit, so that described current transformer control unit receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instruction to described switching tube driver.
2. device according to claim 1 is characterized in that, described device also comprises: first diode and second diode; Described first energy-storage units comprises first capacitance group and first resistance; Described input power supply has positive output end and negative output terminal;
The positive pole of described first diode connects the positive output end of input power supply, and the negative pole of first diode connects first end of first resistance and the negative pole of second diode; Second end of described first resistance connects first end of anodal and described first capacitance group of second diode, and second end of described first capacitance group connects the negative output terminal of input power supply; The negative pole of described second diode is connected to the current transformer control unit;
Described under voltage protection unit comprises for the input power source voltage is sampled: described under voltage protection unit is used for the voltage of the positive output end of input power supply is sampled.
3. device according to claim 2, it is characterized in that, described first capacitance group is composed in parallel by at least one electrochemical capacitor, the positive pole of each electrochemical capacitor all connects the positive pole of described second diode in first capacitance group, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in first capacitance group.
4. device according to claim 1 is characterized in that, described device also comprises: the 3rd diode and the 4th diode; Described second energy-storage units comprises second capacitance group and second resistance; Described input power supply has positive output end and negative output terminal;
The positive pole of described the 3rd diode connects the positive output end of input power supply, and the negative pole of the 3rd diode connects first end of second resistance and the negative pole of the 4th diode; Second end of described second resistance connects first end of anodal and described second capacitance group of the 4th diode, and second end of described second capacitance group connects the negative output terminal of input power supply; The negative pole of described the 4th diode is connected to the switching tube driver;
Described under voltage protection unit comprises for the input power source voltage is sampled: described under voltage protection unit is used for the voltage of the positive output end of input power supply is sampled.
5. device according to claim 4, it is characterized in that, described second capacitance group is composed in parallel by at least one electrochemical capacitor, the positive pole of each electrochemical capacitor all connects the positive pole of described the 4th diode in second capacitance group, and the negative pole of each electrochemical capacitor all connects the negative output terminal of importing power supply in second capacitance group.
6. according to any described device of claim 1 to 5, it is characterized in that described under voltage protection unit comprises: voltage sample unit, voltage comparison unit, switching tube and relay; Described voltage sample unit is used for described input power source voltage is sampled, described voltage comparison unit is used for the voltage behind the described voltage sample unit sampling and first reference voltage are compared, if the voltage after the sampling is less than described first reference voltage, then voltage comparison unit transmit button pipe controls signal to described switching tube; Described switch controlled signal is used for the conducting state of the described switching tube of control;
Described relay and described switching tube are arranged in same loop, described relay is used for judging according to the conducting state of switching tube whether the transmit button pipe controls signal to described switching tube to described voltage comparison unit, if then send the under-voltage locking signal to described current transformer control unit.
7. device according to claim 6 is characterized in that, described input power supply has positive output end and negative output terminal;
Described voltage sample unit comprises the 3rd resistance and the 4th resistance; Be connected between the positive output end and negative output terminal of input power supply after described the 3rd resistance and the series connection of described the 4th resistance, the node between described the 3rd resistance and the 4th resistance is the output of described voltage sample unit.
8. device according to claim 6 is characterized in that, described input power supply has positive output end and negative output terminal;
Described voltage comparison unit comprises first voltage comparator, second voltage comparator, the 5th resistance, the 6th resistance and the 7th resistance; The first input end of described first voltage comparator is connected to the output of described voltage sample unit by the 5th resistance, and second input of described first voltage comparator connects first reference voltage; The first input end of described second voltage comparator connects the output of first voltage comparator by the 6th resistance, second input of described second voltage comparator connects second reference voltage, and the output of described second voltage comparator connects described switching tube by the 7th resistance.
9. device according to claim 6 is characterized in that, described switching tube is metal-oxide-semiconductor, and the output of described voltage comparison unit connects the grid of described metal-oxide-semiconductor; The control end of the source electrode of described metal-oxide-semiconductor and drain electrode, described relay is connected between the positive output end and negative output terminal of described input power supply, and the controlled terminal of described relay connects described current transformer control unit.
10. device according to claim 6 is characterized in that, described under voltage protection unit also comprises the 8th resistance and the light-emitting diode of series connection, when described light-emitting diode is used for described switching tube conducting, and described lumination of light emitting diode.
11. device according to claim 1, it is characterized in that, described device also comprises the common mode filtering circuit, and described common mode filtering circuit is used for described input power source voltage is carried out exporting to behind the common mode filtering switching tube driver, first energy-storage units and second energy-storage units of current transformer control unit, converter module.
12. device according to claim 11; it is characterized in that; described device also comprises surge protection circuit; described surge protection circuit is used for the voltage of common-mode filter output is carried out surge protection, and exports the voltage behind the surge protection in current transformer control unit, the converter module switching tube driver, first energy-storage units and second energy-storage units.
13. converter control system under voltage protection system, it is characterized in that, described under voltage protection system comprise in input power supply, current transformer control unit, the converter module the switching tube driver and as any described converter control system less voltage protector of claim 1 to 12;
Described current transformer control unit and described switching tube driver are powered by described input power supply;
Described current transformer control unit receives behind the described under-voltage locking signal running protection mode of operation and sends blocking instruction to described switching tube driver;
Described switching tube driver receives the switching tube that turn-offs behind the blocking instruction in the converter module.
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