CN112751494B

CN112751494B - Control method and control device for auxiliary resonant converter pole converter

Info

Publication number: CN112751494B
Application number: CN202011633899.2A
Authority: CN
Inventors: 李国策; 刘博�; 张宇探; 李德胜; 郑隽一; 张育铭
Original assignee: Guochuang Mobile Energy Innovation Center Jiangsu Co Ltd
Current assignee: Guochuang Mobile Energy Innovation Center Jiangsu Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-04-19
Anticipated expiration: 2040-12-31
Also published as: CN112751494A

Abstract

The invention provides a control method and a control device of an auxiliary resonance converter pole converter, wherein the auxiliary resonance converter pole converter comprises: a voltage dividing circuit; an inverter circuit comprisingThe first and second diodes are connected in series, and the first and second switching tubes are connected in series; a resonant circuit; the auxiliary resonance inversion electrode, the control method comprises the following steps: obtaining the voltage V of the first switch tube in the current control period_S1(k) And current I_S1(k) Voltage V of the second switching tube_S2(k) And current I_S2(k) (ii) a According to V_S1(k) And I_S1(k) Adjusting the conduction time of the first switch tube in the next control period according to V_S2(k) And I_S2(k) And adjusting the conduction time of a second switch tube in the next control period. The method adjusts the conduction time of the switch tube according to the voltage and the current of the switch tube, so that the auxiliary resonant converter pole converter can always work within the soft switching range without being influenced by parameter difference of control system devices, and the loss is reduced.

Description

Control method and control device for auxiliary resonant converter pole converter

Technical Field

The invention relates to the technical field of power electronics, in particular to a control method of an auxiliary resonance converter pole converter and a control device of the auxiliary resonance converter pole converter.

Background

In the occasions of applying power converters to new energy inverter grid-connected systems, uninterruptible power supplies and the like, the requirements on the conversion efficiency and the performance of the inverters are higher and higher. The switching frequency of the inverter is improved, the response speed of a system can be increased, and the size of an output filter inductor can be reduced, so that the performance of the inverter is improved. However, in the conventional hard switching inverter topology, the switching loss of the inverter becomes larger as the switching frequency increases, which not only increases the heat generation of the system, but also reduces the conversion efficiency of the inverter, which is very disadvantageous to the reliability of the system.

The soft Switching technology can realize Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS) of the power device, so that Switching loss can be reduced and conversion efficiency can be improved. An Auxiliary Resonant converter Pole converter (ARCP) is an important inverter soft switching topology, and the circuit structure of the ARCP is relatively simple, so that the ZCS of the main tube and the ZCS of the Auxiliary tube can be realized.

The determination of the conduction time of the main pipe of the auxiliary resonance converter pole converter directly influences the conduction loss. However, since the device parameters have certain fluctuation, such as fluctuation of input voltage, change of temperature, change of load, and the on speed of the switching tube itself, the performance will inevitably change over time, and these slight changes are very unfavorable for the on control of the switching tube, which will cause the system to be unable to accurately control its on time, resulting in a large increase of system loss.

Disclosure of Invention

The invention provides a control method of an auxiliary resonance converter pole converter to solve the technical problems, and the method continuously adjusts the conducting time of a switching tube according to the voltage and the current of the switching tube of the auxiliary resonance converter pole converter, so that the auxiliary resonance converter pole converter can always work within the soft switching range without being influenced by the variation of device parameter difference, temperature, load and the like, and the loss is reduced.

The invention also provides a control device of the auxiliary resonance converter pole converter.

The technical scheme adopted by the invention is as follows:

an embodiment of the first aspect of the present invention provides a method for controlling an auxiliary resonant commutating pole converter, where the auxiliary resonant commutating pole converter includes: the input end of the voltage division circuit is connected with a direct current power supply; the inverter circuit comprises a first bridge arm and a second bridge arm, the first bridge arm comprises a first diode and a second diode which are connected in series, a first node is arranged between the first diode and the second diode, the second bridge arm comprises a first switch tube and a second switch tube which are connected in series, a second node is arranged between the first switch tube and the second switch tube, and the first switch tube and the second switch tube are connected in seriesThe first bridge arm and the second bridge arm are connected in parallel and then are connected with the input end of the voltage division circuit; the resonant circuit comprises a first capacitor and a second capacitor which are connected in series, a third node is arranged between the first capacitor and the second capacitor, and the resonant circuit is connected with the inverter circuit in parallel; one end of the auxiliary resonant commutation pole is connected with the output end of the voltage division circuit, and the other end of the auxiliary resonant commutation pole is connected with the first node, the second node and the third node and then connected with the load; the control method comprises the following steps: acquiring the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) (ii) a According to the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of the second switch tube in the next control period.

According to an embodiment of the present invention, the voltage V across the first switch tube is based on the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) Adjusting the second switch tube on-time for the next control cycle, comprising: if said V of the current control period_S1(k) Is equal to zero and said I_S1(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, controlling the first switch tube to be conducted, or if the V of the current control period is equal to_S2(k) Is equal to zero and said I_S2(k) Equal to zero, then underA control period when the voltage V at two ends of the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted; if said V of the current control period_S1(k) Is equal to zero, and said I_S1(k) If the voltage is larger than zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, delaying preset time dt (k +1) to control the first switch tube to be conducted, or if the current control period V is the same as the current control period V_S2(k) Is equal to zero, and said I_S2(k) If the voltage is greater than zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, delaying preset time dt (k +1) to control the second switching tube to be conducted; if said V of the current control period_S1(k) Is equal to zero, and said I_S1(k) Is less than zero), then in the next control period, when the voltage V across the first switch tube is lower than the voltage V across the first switch tube_S1(k) When the current value is equal to zero, a preset time dt (k +1) is advanced to control the first switch tube to be conducted, or if the V of the current control period is equal to zero_S2(k) Is equal to zero, and said I_S2(k) Is less than zero), then in the next control period, when the voltage V across the second switch tube is lower than the voltage V across the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted by a preset time dt (k +1) in advance.

According to one embodiment of the invention, said preset time dt (k +1) is calculated according to the following formula:

or,

wherein dt (K +1) is the preset time, K₁、K₂To adjust the coefficients, I_S1(k) Is the current flowing through the first switching tube of the upper bridge arm of the second bridge arm, I_S2(k) The current is the current flowing through the second switching tube of the lower bridge arm of the second bridge arm.

According to one embodiment of the invention, the auxiliary resonant commutating pole comprises: a collector of the first IGBT is connected with the output end of the voltage division circuit; the emitter of the second IGBT is connected with the emitter of the first IGBT; and one end of the first inductor is connected with the collector of the second IGBT, and the other end of the first inductor is connected with the first node.

An embodiment of a second aspect of the invention provides a control apparatus for an auxiliary resonant commutating pole converter, comprising: the input end of the voltage division circuit is connected with a direct current power supply; the inverter circuit comprises a first bridge arm and a second bridge arm, the first bridge arm comprises a first diode and a second diode which are mutually connected in series, a first node is arranged between the first diode and the second diode, the second bridge arm comprises a first switching tube and a second switching tube which are mutually connected in series, a second node is arranged between the first switching tube and the second switching tube, and the first bridge arm and the second bridge arm are mutually connected in parallel and then are connected with the input end of the voltage division circuit; the resonant circuit comprises a first capacitor and a second capacitor which are connected in series, a third node is arranged between the first capacitor and the second capacitor, and the resonant circuit is connected with the inverter circuit in parallel; one end of the auxiliary resonant commutation pole is connected with the output end of the voltage division circuit, and the other end of the auxiliary resonant commutation pole is connected with the first node, the second node and the third node and then connected with the load; the control device includes: an acquisition module for acquiring the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) (ii) a A control module for controlling the voltage V between two ends of the first switch tube according to the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the conduction time of the first switch tube in the next control period according to the current control periodVoltage V at two ends of the second switch tube_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of the second switch tube in the next control period.

According to an embodiment of the present invention, the control module is specifically configured to: if said V of the current control period_S1(k) Is equal to zero and said I_S1(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, controlling the first switch tube to be conducted, or if the V of the current control period is equal to_S2(k) Is equal to zero and said I_S2(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted; if said V of the current control period_S1(k) Is equal to zero, and said I_S1(k) If the voltage is larger than zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, delaying preset time dt (k +1) to control the first switch tube to be conducted, or if the current control period V is the same as the current control period V_S2(k) Is equal to zero, and said I_S2(k) If the voltage is greater than zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, delaying preset time dt (k +1) to control the second switching tube to be conducted; if said V of the current control period_S1(k) Is equal to zero, and said I_S1(k) Is less than zero), then in the next control period, when the voltage V across the first switch tube is lower than the voltage V across the first switch tube_S1(k) When the current value is equal to zero, a preset time dt (k +1) is advanced to control the first switch tube to be conducted, or if the V of the current control period is equal to zero_S2(k) Is equal to zero, and said I_S2(k) Is less than zero), then in the next control period, when the voltage V across the second switch tube is lower than the voltage V across the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted by a preset time dt (k +1) in advance.

or,

The invention has the beneficial effects that:

the invention continuously adjusts the conduction time of the switch tube according to the voltage and the current of the switch tube of the auxiliary resonance converter pole converter, so that the auxiliary resonance converter pole converter can always work within the soft switch range without being influenced by the variation of device parameter difference, temperature, load and the like, and the loss is reduced.

Drawings

FIG. 1 is a circuit topology diagram of an auxiliary resonant converter pole converter according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of commutation stage 1 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of commutation stage 2 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of commutation stage 3 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of commutation stage 4 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of commutation stage 5 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 7 is a schematic diagram of a commutation phase 6 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 8 is a schematic diagram of commutation stage 7 of an auxiliary resonant commutating pole converter according to one embodiment of the present invention;

FIG. 9 is a flow chart of a method of controlling an auxiliary resonant converter pole converter in accordance with one embodiment of the present invention;

figure 10 is a block schematic diagram of a control arrangement for an auxiliary resonant converter pole converter in accordance with one embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a circuit topology diagram of an auxiliary resonant converter pole converter according to one embodiment of the invention. As shown in fig. 1, the auxiliary resonant commutating pole converter comprises: the circuit comprises a voltage division circuit 1, an inverter circuit 2, a resonant circuit 3 and an auxiliary resonant commutation pole 4.

Wherein, the input end of the voltage division circuit 1 is connected with the DC power supply V_dcConnecting; inverter circuit 2 includes a first leg 201 and a second leg 202, first leg 201 includes a first diode D1 and a second diode D2 connected in series, first diode D1 and second diode D2 have a first node Q1, second leg 202 includes a first switch tube S1 and a second switch tube S2 connected in series, and first switch tube S1 and second switch tube S2 have a second node Q2, first leg 201 and second leg 202 are connected in parallel and then connected to an input terminal of voltage divider circuit 1; the resonant circuit 3 comprises a first capacitor C1 and a second capacitor C2 connected in series, and a capacitor C1 and a capacitor C2 are arranged between the first capacitor C1 and the second capacitor C2At the third node Q3, the resonant circuit 3 is connected in parallel with the inverter circuit 2; one end of the auxiliary resonant inverting electrode 4 is connected with the output end of the voltage division circuit 1, and the other end of the auxiliary resonant inverting electrode 4 is connected with the Load after being connected with the first node Q1, the second node Q2 and the third node Q3.

According to one embodiment of the invention, an auxiliary resonant commutating pole comprises: the first IGBT (A1), the second IGBT (A2) and the first inductor Lr. The collector of the first IGBT (A1) is connected with the output end of the voltage division circuit; the emitter of the second IGBT (A2) is connected with the emitter of the first IGBT (A1); one end of the first inductor Lr is connected to the collector of the second IGBT (a2), and the other end of the first inductor Lr is connected to the first node Q1. Free wheel diodes D are provided between the emitters and collectors of the first IGBT (A1) and the second IGBT (A2)_A1And D_A2。

The voltage division circuit 1 comprises two voltage division capacitors C connected in series_dcTwo voltage-dividing capacitors C_dcBetween which a fourth node Q4, Q4, is present as the output of the voltage divider circuit 1.

The implementation process of the resonance-assisted converter pole converter is as follows:

commutation phase 1, as shown in figure 2, is initially turned off at S1, with the voltage (V) across C1_C1) Rise and load current from C₁And C₂Common conduction, which slows the dV/dt changes, which are mainly controlled by the resonance capacitance (C1+ C2).

Commutation phase 2, fig. 3, S2 is on and the power supply is not supplying power to the load. The voltage across C1 is equal to V_dc。

Commutation stage 3, shown in FIG. 4, conducts A1, L_rVoltage at both ends is V_dc(ii)/2, current flows through A1, D_A2And L_rThrough L_rCurrent of (I)_rDuring this period, with I increasing_rIncrease of (2), S₂The current in (1) continuously decreases_loadIs I_rAnd I_S2And (4) summing. Turn off timing of S2 affects flow through D₂Current of off-timing I_rAnd I_loadAt equal times.

Commutation stage 4, as shown in FIG. 5, I_rPersistenceIncrease, call I_rAnd I_loadThe difference is the commutation current. With S2 turned off, the commutation current charges C1, C2, thereby charging V_bridgeRising, Ir continues to increase until V_bridgeAnd V_dcAnd/2 is equal. When the voltage across S1 is zero, S1 turns on, starting to supply power to the load.

Commutation stage 5, as shown in FIG. 6, at which stage I_rDecrease continuously, I_rFalls to 0 and a1 turns off.

Commutation stage 6, as shown in fig. 7, S1 conducts the entire load current.

Commutation stage 7, as shown in fig. 8, is the same as commutation stage 1.

The control method of the present invention is described below with reference to specific embodiments, in which the turn-on timings of S1 and S2 are controlled to minimize the switching loss.

Figure 9 is a flow chart of a method of controlling an auxiliary resonant commutating pole converter according to one embodiment of the present invention. As shown in fig. 9, the control method includes the steps of:

s10, obtaining the voltage V at two ends of the first switch tube S1 in the current control period_S1(k) And a current I flowing through the first switching tube S1_S1(k) And obtaining the voltage V across the second switch tube S2 in the current control period_S2(k) And a current I flowing through the second switching tube S2_S2(k)。

S20, according to the current control period, the voltage V between the two ends of the first switch tube S1_S1(k) And a current I flowing through the first switching tube S1_S1(k) Adjusting the turn-on time of the first switch S1 in the next control period, and adjusting the voltage V across the second switch S2 according to the current control period_S2(k) And a current I flowing through the second switching tube S2_S2(k) And adjusting the conduction time of the second switch tube S2 in the next control period.

In particular, V_S1(k) And I_S1(k) Indicates the voltage across S1 and the current, V, through S1 during this period_S1(k) And I_S2(k) The voltage across the present period S2 and the current flowing through S2 are shown, and dt (k +1) represents the variation value of the conduction time of the switching tube in the next period. Through collected switch tubes S1 and S2, adjusting the conducting time of the switching tubes S1 and S2 in the next period, wherein the commutation periods 1-7 are a control period. Therefore, the method adjusts the conduction time of the switch tube according to the voltage and the current of the switch tube, so that the auxiliary resonant converter pole converter can always work within the soft switching range without being influenced by parameter difference of control system devices, and the loss is reduced.

According to an embodiment of the present invention, the voltage V across the first switch tube S1 is based on the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the turn-on time of the first switch tube in the next control period, comprising: if V of the current control period_S1(k) Is equal to zero and I_S1(k) Equal to zero, then in the next control period, when the voltage V across the first switch tube S1_S1(k) When the voltage is equal to zero, controlling the first switching tube to be conducted; if V of the current control period_S1(k) Is equal to zero, and I_S1(k) If the voltage is greater than zero, the voltage V across the first switch tube S1 is the same as the voltage V across the first switch tube S1 in the next control period_S1(k) When the voltage is equal to zero, delaying preset time dt (k +1) to control the first switching tube to be conducted; if V of the current control period_S1(k) Is equal to zero, and I_S1(k) Is less than zero), then in the next control period, when the voltage V across the first switch tube S1 is lower_S1(k) When the voltage is equal to zero, the first switching tube is controlled to be conducted by a preset time dt (k +1) in advance.

Specifically, if S1 is in the current control period V_S1(k) When equal to 0, I_S1(k) When the next control period is equal to 0, the conducting time of the next control period is consistent with the period, and V is_S1(k) When the voltage is equal to 0, the connection is carried out; if S1 is at V_S1(k) Already switched on before 0, i.e. at V_S1(k) When equal to 0, I_S1(k)>0, the turn-on time of the next period is delayed by dt (k +1), V_S1(k) When equal to 0, I_S1(k) The larger the value of (A), the larger the switching time of the next period is adjusted; if S1 is at V_S1(k) Not yet turned on after 0, i.e. at V_S1(k) When equal to 0, I_S1(k)<0, the turn-on time of the next cycle is advanced by dt (k + 1). Thus, until S1 is at V_S1When the voltage is equal to 0, the current is just conducted (actually, the voltage can be setError range of Δ t, i.e. at V_S1All within ± Δ t of time t being 0 can be considered as just conducting), the conducting time is determined, and a control signal is sent out. Therefore, the conduction time of the switching tube of the auxiliary resonance converter pole converter is continuously adjusted according to the voltage and the current of the switching tube, so that the auxiliary resonance converter pole converter can be always operated within a soft switching range without being influenced by changes of device parameter difference, temperature, load and the like, and the loss is reduced.

The control method of the second switch tube S2 is the same as the principle of S1.

According to an embodiment of the invention, the voltage V across the second switching tube is dependent on the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) Adjusting the conduction time of a second switch tube in the next control period, comprising: if V of the current control period_S2(k) Is equal to zero and I_S2(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted; if V of the current control period_S2(k) Is equal to zero, and I_S2(k) If it is greater than zero, in the next control period, when the voltage V at two ends of the second switch tube_S2(k) When the current value is equal to zero, delaying preset time dt (k +1) to control the second switch tube to be conducted if the current control period V is_S2(k) Is equal to zero, and I_S2(k) Is less than zero), then in the next control period, when the voltage V across the second switch tube is lower than the voltage V across the second switch tube_S2(k) When the voltage is equal to zero, the second switch tube is controlled to be conducted by a preset time dt (k +1) in advance.

In an embodiment of the invention, said preset time dt (k +1) is calculated according to the following formula:

or,

wherein dt (K +1) is a preset time, K₁、K₂To adjust the coefficients, I_S1(k) For passing through the first opening of the upper arm of the second bridge armCurrent at turn-off, I_S2(k) Is the current flowing through the second switching tube of the lower bridge arm of the second bridge arm, K₁、K₂Can be acquired through relevant experiments and prestored.

In summary, according to the control method of the auxiliary resonant converter pole converter in the embodiment of the invention, the voltage V across the first switch tube in the current control period is obtained_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) (ii) a According to the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of a second switch tube in the next control period. Therefore, the method continuously adjusts the conduction time of the switching tube according to the voltage and the current of the switching tube of the auxiliary resonance converter pole converter, so that the auxiliary resonance converter pole converter can always work within the soft switching range without being influenced by changes of device parameter difference, temperature, load and the like, and the loss is reduced.

Corresponding to the control method of the auxiliary resonance converter pole converter, the invention also provides a control device of the auxiliary resonance converter pole converter. Since the device embodiment of the present invention corresponds to the method embodiment described above, the details of the device embodiment for disclosure may refer to the method embodiment described above, and are not repeated in the present invention.

Figure 10 is a block schematic diagram of a control arrangement for an auxiliary resonant converter pole converter in accordance with one embodiment of the present invention. As shown in fig. 1, the auxiliary resonant commutating pole converter includes: the circuit comprises a voltage division circuit 1, an inverter circuit 2, a resonant circuit 3 and an auxiliary resonant commutation pole 4.

Input end of voltage division circuit 1 and direct current power supply V_dcConnecting; inverter circuit 2 includes a first leg 201 and a second leg 200, first leg 201 including a first diode D1 and a second diode D1 connected in series with each otherDiode D2, a first node Q1 is formed by a first diode D1 and a second diode D2, second bridge arm 202 comprises a first switch tube S1 and a second switch tube S2 which are connected in series, a second node Q2 is formed by a first switch tube S1 and a second switch tube S2, and first bridge arm 201 and second bridge arm 202 are connected in parallel and then connected with the input end of voltage division circuit 1; the resonant circuit 3 comprises a first capacitor C1 and a second capacitor C2 which are connected in series, a third node Q3 is arranged between the first capacitor C1 and the second capacitor C2, and the resonant circuit 3 is connected with the inverter circuit 2 in parallel; one end of the auxiliary resonant inverting electrode 4 is connected with the output end of the voltage division circuit 1, and the other end of the auxiliary resonant inverting electrode 4 is connected with the Load after being connected with the first node Q1, the second node Q2 and the third node Q3.

According to one embodiment of the invention, an auxiliary resonant commutating pole comprises: the first IGBT (A1), the second IGBT (A2) and the first inductor Lr. The collector of the first IGBT (A1) is connected with the output end of the voltage division circuit; the emitter of the second IGBT (A2) is connected with the emitter of the first IGBT (A1); one end of the first inductor Lr is connected to the collector of the second IGBT (a2), and the other end of the first inductor Lr is connected to the first node Q1. The voltage division circuit 1 comprises two voltage division capacitors C connected in series_dcTwo voltage-dividing capacitors C_dcBetween which a fourth node Q4, Q4, is present as the output of the voltage divider circuit 1.

As shown in fig. 10, the control device includes: an acquisition module 10 and a control module 20. The collecting module 10 is used for obtaining the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) (ii) a The control module 20 is used for controlling the voltage V between the two ends of the first switch tube according to the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of a second switch tube in the next control period.

In particular, V_S1(k) And I_S1(k) Watch (A)Showing the voltage across S1 and the current, V, through S1 during this period_S1(k) And I_S2(k) The voltage across the present period S2 and the current flowing through S2 are shown, and dt (k +1) represents the variation value of the conduction time of the switching tube in the next period. The switching-on time of the switching tubes S1 and S2 in the next period is adjusted through the collected voltage and current signals at two ends of the switching tubes S1 and S2, and the commutation stages 1-7 are a control period. Therefore, the device adjusts the conduction time of the switch tube according to the voltage and the current of the switch tube, so that the auxiliary resonance converter pole converter can always work within the soft switching range without being influenced by parameter difference of control system devices, and the loss is reduced.

According to an embodiment of the present invention, the control module 20 is specifically configured to: if V of the current control period_S1(k) Is equal to zero and I_S1(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, controlling the first switch tube to be conducted, or if the current control period V is equal to_S2(k) Is equal to zero and I_S2(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted;

if V of the current control period_S1(k) Is equal to zero, and I_S1(k) If it is greater than zero, in the next control period, when the voltage V at two ends of the first switch tube_S1(k) When the current value is equal to zero, delaying preset time dt (k +1) to control the first switch tube to be conducted, or if the current control period V is_S2(k) Is equal to zero, and I_S2(k) If it is greater than zero, in the next control period, when the voltage V at two ends of the second switch tube_S2(k) When the voltage is equal to zero, delaying preset time dt (k +1) to control the conduction of the second switching tube;

if V of the current control period_S1(k) Is equal to zero, and I_S1(k) Is less than zero), then in the next control period, when the voltage V across the first switch tube is lower than the voltage V across the second switch tube_S1(k) When the current value is equal to zero, the first switch tube is controlled to be conducted by a preset time dt (k +1) in advance, or if the current control period V is_S2(k) Is equal to zero, and I_S2(k) Is less than zero), then in the next control period,when the voltage V is applied across the second switch tube_S2(k) When the voltage is equal to zero, the second switch tube is controlled to be conducted by a preset time dt (k +1) in advance.

or,

wherein dt (K +1) is a preset time, K₁、K₂To adjust the coefficients, I_S1(k) Is the current flowing through the first switching tube of the upper bridge arm of the second bridge arm, I_S2(k) Is the current flowing through the second switching tube of the lower bridge arm of the second bridge arm, K₁、K₂Can be acquired through relevant experiments and prestored.

In summary, the control device of the auxiliary resonant inverter pole converter according to the embodiment of the invention passes. The acquisition module acquires voltage V at two ends of a first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) The control module 20 controls the first switch tube to switch between the first and second states according to the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of a second switch tube in the next control period. Therefore, the device adjusts the conduction time of the switch tube according to the voltage and the current of the switch tube, so that the auxiliary resonance converter pole converter can always work within the soft switching range without being influenced by parameter difference of control system devices, and the loss is reduced.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A method of controlling an auxiliary resonant commutating pole converter, said auxiliary resonant commutating pole converter comprising:

the input end of the voltage division circuit is connected with a direct current power supply;

the inverter circuit comprises a first bridge arm and a second bridge arm, the first bridge arm comprises a first diode and a second diode which are mutually connected in series, a first node is arranged between the first diode and the second diode, the second bridge arm comprises a first switching tube and a second switching tube which are mutually connected in series, a second node is arranged between the first switching tube and the second switching tube, and the first bridge arm and the second bridge arm are mutually connected in parallel and then are connected with the input end of the voltage division circuit;

the resonant circuit comprises a first capacitor and a second capacitor which are connected in series, a third node is arranged between the first capacitor and the second capacitor, and the resonant circuit is connected with the inverter circuit in parallel;

one end of the auxiliary resonant commutation pole is connected with the output end of the voltage division circuit, and the other end of the auxiliary resonant commutation pole is connected with the first node, the second node and the third node and then connected with a load;

the control method comprises the following steps:

acquiring the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k)；

According to the voltage V at two ends of the first switch tube in the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of the second switch tube in the next control period.

2. The method of claim 1, wherein the voltage across the first switching transistor V is based on the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) Adjusting the second switch tube on-time for the next control cycle, comprising:

if said V of the current control period_S1(k) Is equal to zero and said I_S1(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, controlling the first switch tube to be conducted, or if the V of the current control period is equal to_S2(k) Is equal to zero and said I_S2(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) Etc. ofWhen the voltage is zero, the second switching tube is controlled to be conducted;

if said V of the current control period_S1(k) Is equal to zero, and said I_S1(k) If the voltage is larger than zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, delaying preset time dt (k +1) to control the first switch tube to be conducted, or if the current control period V is the same as the current control period V_S2(k) Is equal to zero, and said I_S2(k) If the voltage is greater than zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, delaying preset time dt (k +1) to control the second switching tube to be conducted;

if said V of the current control period_S1(k) Is equal to zero, and said I_S1(k) When the voltage is less than zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, a preset time dt (k +1) is advanced to control the first switch tube to be conducted, or if the V of the current control period is equal to zero_S2(k) Is equal to zero, and said I_S2(k) Is less than zero), then in the next control period, when the voltage V across the second switch tube is lower than the voltage V across the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted by a preset time dt (k +1) in advance.

3. A method of controlling an auxiliary resonant converter pole converter according to claim 2,

or,

4. A method of controlling an auxiliary resonant converter pole converter according to claim 1, wherein said auxiliary resonant converter pole comprises:

a collector of the first IGBT is connected with the output end of the voltage division circuit;

the emitter of the second IGBT is connected with the emitter of the first IGBT;

and one end of the first inductor is connected with the collector of the second IGBT, and the other end of the first inductor is connected with the first node.

5. A control apparatus for an auxiliary resonant commutating pole converter, said auxiliary resonant commutating pole converter comprising:

the control device includes:

an acquisition module for acquiring a current control periodVoltage V across the first switching tube_S1(k) And a current I flowing through the first switching tube_S1(k) And obtaining the voltage V at two ends of the second switch tube in the current control period_S2(k) And a current I flowing through the second switching tube_S2(k)；

A control module for controlling the voltage V between two ends of the first switch tube according to the current control period_S1(k) And a current I flowing through the first switching tube_S1(k) Adjusting the conduction time of the first switch tube in the next control period, and adjusting the voltage V at two ends of the second switch tube according to the current control period_S2(k) And a current I flowing through the second switching tube_S2(k) And adjusting the conduction time of the second switch tube in the next control period.

6. The control device of the auxiliary resonant converter pole converter of claim 5, wherein the control module is specifically configured to: if said V of the current control period_S1(k) Is equal to zero and said I_S1(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the first switch tube_S1(k) When the current value is equal to zero, controlling the first switch tube to be conducted, or if the V of the current control period is equal to_S2(k) Is equal to zero and said I_S2(k) When the voltage is equal to zero, in the next control period, when the voltage V at the two ends of the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted;

if the current control period isThe V is_S1(k) Is equal to zero, and said I_S1(k) Is less than zero), then in the next control period, when the voltage V across the first switch tube is lower than the voltage V across the first switch tube_S1(k) When the current value is equal to zero, a preset time dt (k +1) is advanced to control the first switch tube to be conducted, or if the V of the current control period is equal to zero_S2(k) Is equal to zero, and said I_S2(k) Is less than zero), then in the next control period, when the voltage V across the second switch tube is lower than the voltage V across the second switch tube_S2(k) When the voltage is equal to zero, the second switching tube is controlled to be conducted by a preset time dt (k +1) in advance.

7. The control device of an auxiliary resonant converter pole converter according to claim 6, characterized in that said preset time dt (k +1) is calculated according to the following formula:

or,

8. A control arrangement for an auxiliary resonant converter pole converter according to claim 5, wherein said auxiliary resonant converter pole comprises:

the emitter of the second IGBT is connected with the emitter of the first IGBT;