CN114236335B - DC conversion module switching tube voltage stress detection circuit and control method thereof - Google Patents
DC conversion module switching tube voltage stress detection circuit and control method thereof Download PDFInfo
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- CN114236335B CN114236335B CN202111463815.XA CN202111463815A CN114236335B CN 114236335 B CN114236335 B CN 114236335B CN 202111463815 A CN202111463815 A CN 202111463815A CN 114236335 B CN114236335 B CN 114236335B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2632—Circuits therefor for testing diodes
- G01R31/2633—Circuits therefor for testing diodes for measuring switching properties thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a voltage stress detection circuit of a switching tube of a direct current conversion module and a control method thereof, wherein the direct current conversion module comprises a high-voltage side converter, a transformer, a low-voltage side converter, a buck module and a controller which are sequentially connected, the buck module comprises a switching tube Q7, sampling units, an estimation unit and a control unit are connected between two ends of the switching tube Q7 and a grid electrode of the switching tube Q7, and the sampling units sample voltage values Vds at two ends when the switching tube Q7 is turned off and send the voltage values Vds to the estimation unit; the estimating unit sets the time when the minimum value of the voltage values Vds is detected as the minimum stress point time of the switching device; the control unit performs direct current conversion by taking the moment of the minimum stress point as the turn-off moment of the switching tube Q7; the invention can accurately find the time point of the minimum stress of the power tube, and the power tube is closed in the time, so that the stress deviation of the switching tube can be reduced, and the reliability of the system is ensured; the switch tube specification is convenient to select, the product reliability is improved, and the production cost can be indirectly reduced.
Description
Technical Field
The invention relates to the field of electronic power, in particular to a voltage stress detection circuit of a switching tube of a direct-current conversion module and a control method thereof.
Background
The turn-off time of a switching tube in a low-voltage side buck circuit is generally set in the dead time T of a high-voltage side switching tube, but for a mass-produced power circuit product, an actual dead time value and a low-voltage side switching tube turn-off time value are solidified into software, and the actual dead time value and the low-voltage side switching tube turn-off time value are mostly obtained by actual testing of a sample grinder in the early stage of product design, but due to the existence of parameter variability of mass-produced products, the stress deviation of the switching tube is larger due to the fact that the switching tube is still caused by the value, and the specification and the shape selection of the switching tube are influenced. For example, the voltage stress of the first product test is 85V, the voltage stress of the second product test is 95V, the parameter difference causes poor consistency, and the device model selection needs to consider larger allowance. In addition, as the device ages, the performance parameters change, the stress deviation of the switching tube is also larger, and the reliability of the product is affected.
Therefore, designing an optimal turn-off time capable of automatically detecting the minimum stress point of the switching tube on the equipment is a technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a voltage stress detection circuit of a switching tube of a direct-current conversion module and a control method thereof.
The technical scheme adopted by the invention is to design a voltage stress detection circuit of a switching tube of a direct current conversion module, wherein the direct current conversion module comprises a high-voltage side converter, a transformer, a low-voltage side converter, a buck module and a controller which are sequentially connected, the controller controls the actions of the high-voltage side converter, the low-voltage side converter and the buck module, direct current electric energy is transmitted to the buck module from the high-voltage side converter, the buck module comprises a switching tube Q7, sampling units, an estimation unit and a control unit are connected between two ends of the switching tube Q7 and a grid electrode of the switching tube Q7, and the sampling units are used for sampling voltage values Vds at two ends when the switching tube Q7 is turned off and transmitting the voltage values Vds to the estimation unit; the estimating unit sets a time when the minimum value of the voltage values Vds is detected as a minimum stress point time of the switching device; the control unit performs direct current conversion by taking the minimum stress point moment as the turn-off moment of the switching tube Q7.
And a peak hold circuit is connected between the switching tube Q7 and the sampling unit and is used for capturing the voltage value Vds of the switching tube Q7 during peak value.
The sampling unit adopts a voltage sensor.
The high side converter includes a full bridge conversion module and the low side converter includes a push-pull conversion module.
The invention also designs a control method of the voltage stress detection circuit of the switching tube of the direct-current conversion module, wherein the detection circuit comprises the voltage stress detection circuit of the switching tube of the direct-current conversion module, and the control method comprises the following steps: taking the moment of turning off a power switch in a high-voltage side converter as T0, taking T0+M as the test turning-off moment of a switching tube Q7, wherein M is a variable, the value range of M is between [ -T and T ], detecting voltage values Vds at two ends when the switching tube Q7 is turned off for a plurality of times, recording the minimum value of the sampled voltage values Vds, recording the time tk corresponding to the minimum value, taking T0+tk as the minimum stress point moment, and taking the minimum stress point moment as the turning-off moment of the switching tube Q7 to perform direct current conversion.
Setting a step length a, enabling the step length a to be 2T/N, taking T0+ (-t+a) k as the test turn-off time, wherein k is a counter, the value of the counter is an integer between 0 and N, increasing k gradually, and detecting the voltage value Vds for n+1 times.
The control method comprises the following specific steps:
step 1, driving a high-voltage side converter, a low-voltage side converter and a buck module to work;
step 2, detecting the turn-off time of a power switch in the high-voltage side converter, wherein the turn-off time of the power switch in the high-voltage side converter is T0;
step 3, taking T0+M as a test turn-off time of a switching tube Q7, wherein M is a variable value range between [ -T, T ], setting a step length a, enabling the step length a to be 2T/N, and setting k to be 0;
step 4, taking T0+ (-t+a) k) as the test turn-off time to drive the switching tube Q7 to turn off;
step 5, detecting and recording a voltage value Vds, and adding 1 to k;
step 6, judging whether k is equal to N, if yes, turning to step 7, otherwise turning to step 4;
step 7, inquiring the minimum value of the voltage values Vds in the record, and recording the time tk corresponding to the minimum value, wherein the time of T0 plus tk is taken as the minimum stress point moment;
and 8, performing direct current conversion by taking the minimum stress point moment as the turn-off moment of the switching tube Q7.
The technical scheme provided by the invention has the beneficial effects that:
the invention can accurately find the time point of the minimum stress of the power tube, and the power tube is closed in the time, so that the stress deviation of the switching tube can be reduced, and the reliability of the system is ensured; the switch tube specification is convenient to select, the product reliability is improved, and the production cost can be indirectly reduced.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
fig. 1 is a resonant conversion topology architecture of an electric vehicle-mounted charger;
FIG. 2 is a control schematic block diagram;
FIG. 3 is a switching timing diagram of a high side switching tube and buck power tube;
fig. 4 is a flow chart of the moment of obtaining the minimum stress inner point of the switching device.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention discloses a voltage stress detection circuit of a switching tube of a direct current conversion module, which comprises a high-voltage side converter, a transformer, a low-voltage side converter, a buck module and a controller which are sequentially connected, wherein the controller is used for controlling the actions of the high-voltage side converter, the low-voltage side converter and the buck module, transmitting direct current electric energy to the buck module from the high-voltage side converter, referring to a control principle block diagram shown in fig. 2, the buck module comprises a switching tube Q7, sampling units, an estimation unit and a control unit are connected between two ends of the switching tube Q7 and a grid electrode of the switching tube Q7, and the sampling units are used for sampling voltage values Vds (in a preferred embodiment, the sampling units are used for acquiring voltage values when a switching device is turned off by a gun) at two ends of the switching tube Q7 and sending the voltage values Vds to the estimation unit; the estimating unit sets a time when the minimum value of the voltage values Vds is detected as a minimum stress point time of the switching device; the control unit performs direct current conversion by taking the minimum stress point moment as the turn-off moment of the switching tube Q7. The control unit is connected with the grid electrode of the switching tube Q7 and sends out PWM signals, and the PWM signals are adjusted to control the output current.
Fig. 1 shows an application of the invention in a vehicle-mounted charger of an electric vehicle, wherein a primary circuit of the invention is connected with a PFC module, a high-voltage battery in the vehicle is connected with a high-voltage side converter, a low-voltage load in the vehicle is connected with a buck module, and the high-voltage battery in the vehicle can supply power to the low-voltage load in the vehicle through a direct-current conversion module.
Referring to the preferred embodiment shown in fig. 2, a peak hold circuit is connected between the switching tube Q7 and the sampling unit, and the peak hold circuit is used for capturing the voltage value Vds at the peak of the switching tube Q7.
In a preferred embodiment, the sampling unit employs a voltage sensor.
Referring to the preferred embodiment shown in fig. 1, the high side converter includes a full bridge conversion module including four power switches Q1, Q2, Q3, Q4. The low-voltage side converter comprises a push-pull conversion module, and the push-pull conversion module comprises two power switches Q5 and Q6. Referring to the switching timing diagram of the high side switching tube and buck power tube shown in fig. 3, Q1 and Q4 in the high side converter operate synchronously, Q2 and Q3 operate synchronously, and Q1 and Q2 switch operations are opposite. And when the turn-off time of the power switch of the high-voltage side converter is detected, only Q1 is detected. The off-time of the switching transistor Q7 is around the off-time of Q1.
The invention also discloses a control method of the voltage stress detection circuit of the switching tube of the direct-current conversion module, wherein the detection circuit comprises the voltage stress detection circuit of the switching tube of the direct-current conversion module, and the control method comprises the following steps: taking the moment of turning off a power switch in a high-voltage side converter as T0, taking T0+M as the test turning-off moment of a switching tube Q7, wherein M is a variable, the value range of M is between [ -T and T ], detecting voltage values Vds at two ends when the switching tube Q7 is turned off for a plurality of times, recording the minimum value of the sampled voltage values Vds, recording the time tk corresponding to the minimum value, taking T0+tk as the minimum stress point moment, and taking the minimum stress point moment as the turning-off moment of the switching tube Q7 to perform direct current conversion.
In a preferred embodiment, dividing [ -T, T ] into N equal divisions, setting a step size a, making the step size a=2t/N, taking t0+ (-t+a×k) as the test turn-off time, where k is a counter, and taking the value as an integer between 0 and N, increasing k gradually, and detecting the voltage value Vds n+1 times (where N is a positive integer).
In the range of-t, …, 0 and …, detecting the voltage Vds at the two ends of the switching device by the sampling unit every time of stepping until the stepping is finished; specifically, -T is to switch off the switching tube Q7T seconds in advance on the basis of T0, and detect the voltage values corresponding to the two ends of the switching tube Q7 when the switching tube Q7 is switched off; t is the time delay turn-off of the switching tube Q7, and the voltage values corresponding to the two ends of the switching tube Q7 when turned off are detected. The voltage values corresponding to the two ends of the switching tube Q7 are detected by the switching tube Q7 at-t and … 0 …, and V0, V1, V2, V3 and … … Vn are obtained; because a peak hold circuit is connected in series, the collected voltages are peak voltage values. Taking the minimum value in each voltage, wherein min { V0, V1, V2, V3, … … Vn }, the voltage value obtained at the moment is the minimum turn-off voltage stress value, and the time corresponding to the minimum turn-off voltage stress value is t k 。t k The value of (2) may be positive or negative, if t k If the voltage is positive, the switching tube Q7 of the buck circuit is delayed to be turned off compared with the turn-off time of the high-voltage side switching tube; if t k If the voltage is negative, the switching tube Q7 of the buck circuit is turned off in advance compared with the turn-off time of the high-side switching tube.
Referring to the flowchart of fig. 4 for obtaining the minimum stress point moment of the switching device, the control method includes the following specific steps:
step 1, driving a high-voltage side converter, a low-voltage side converter and a buck module to work;
step 2, detecting the turn-off time of a power switch in the high-voltage side converter, wherein the turn-off time of the power switch in the high-voltage side converter is T0;
step 3, taking T0+M as a test turn-off time of a switching tube Q7, wherein M is a variable value range between [ -T, T ], setting a step length a, enabling the step length a to be 2T/N, and setting k to be 0;
step 4, taking T0+ (-t+a) k) as the test turn-off time to drive the switching tube Q7 to turn off;
step 5, detecting and recording voltage value Vds at two ends of the switch tube Q7, and adding 1 to k;
step 6, judging whether k is equal to N, if yes, turning to step 7, otherwise turning to step 4;
step 7, inquiring the minimum value of the voltage values Vds in the record, and recording the time tk corresponding to the minimum value, wherein the time of T0 plus tk is taken as the minimum stress point moment;
and 8, performing direct current conversion by taking the minimum stress point moment as the turn-off moment of the switching tube Q7.
And the switching tube Q7 is turned off at the minimum stress point, so that stress deviation of the switching tube is reduced, and switching loss is reduced.
The above examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations to the present application without departing from the spirit and scope of the present application are intended to be included within the scope of the claims of the present application.
Claims (7)
1. The utility model provides a direct current conversion module switching tube voltage stress detection circuit, direct current conversion module includes high-voltage side converter, transformer, low-voltage side converter, buck module and the controller that connects gradually, the action of controller control high-voltage side converter, low-voltage side converter, buck module is with direct current electric energy by high-voltage side converter transmission to buck module, including switching tube Q7 in the buck module, its characterized in that, sampling unit, estimation unit and the control unit are connected between switching tube Q7 both ends and its grid, wherein
The sampling unit is used for sampling the voltage value Vds at two ends when the switching tube Q7 is turned off and sending the voltage value Vds to the estimating unit;
the estimating unit sets a time when the minimum value of the voltage values Vds is detected as a minimum stress point time of the switching device;
the control unit performs direct current conversion by taking the minimum stress point moment as the turn-off moment of the switching tube Q7.
2. The circuit for detecting voltage stress of switching tube of direct current conversion module according to claim 1, wherein a peak hold circuit is connected between the switching tube Q7 and the sampling unit, and the peak hold circuit is used for capturing the voltage value Vds of the switching tube Q7 at the peak.
3. The direct current conversion module switching tube voltage stress detection circuit according to claim 2, wherein the sampling unit adopts a voltage sensor.
4. The dc conversion module switching tube voltage stress detection circuit of claim 1, wherein the high side converter comprises a full bridge conversion module and the low side converter comprises a push-pull conversion module.
5. A control method of a dc conversion module switching tube voltage stress detection circuit, characterized in that the detection circuit includes the dc conversion module switching tube voltage stress detection circuit according to any one of claims 1 to 4, the control method comprising: taking the moment of turning off a power switch in a high-voltage side converter as T0, taking T0+M as the test turning-off moment of a switching tube Q7, wherein M is a variable, the value range of M is between [ -T and T ], detecting voltage values Vds at two ends when the switching tube Q7 is turned off for a plurality of times, recording the minimum value of the sampled voltage values Vds, recording the time tk corresponding to the minimum value, taking T0+tk as the minimum stress point moment, and taking the minimum stress point moment as the turning-off moment of the switching tube Q7 to perform direct current conversion.
6. The method of claim 5, wherein a step size a is set, the step size a=2t/N, t0+ (-t+a×k) is taken as the test turn-off time, k is a counter, the value of k is an integer between 0 and N, and k is gradually increased, and n+1 times of detection of the voltage value Vds are performed.
7. The method for controlling a switching tube voltage stress detection circuit of a direct current conversion module according to claim 6, wherein the control method comprises the following specific steps:
step 1, driving a high-voltage side converter, a low-voltage side converter and a buck module to work;
step 2, detecting the turn-off time of a power switch in the high-voltage side converter, wherein the turn-off time of the power switch in the high-voltage side converter is T0;
step 3, taking T0+M as a test turn-off time of a switching tube Q7, wherein M is a variable value range between [ -T, T ], setting a step length a, enabling the step length a to be 2T/N, and setting k to be 0;
step 4, taking T0+ (-t+a) k) as the test turn-off time to drive the switching tube Q7 to turn off;
step 5, detecting and recording a voltage value Vds, and adding 1 to k;
step 6, judging whether k is equal to N, if yes, turning to step 7, otherwise turning to step 4;
step 7, inquiring the minimum value of the voltage values Vds in the record, and recording the time tk corresponding to the minimum value, wherein the time of T0 plus tk is taken as the minimum stress point moment;
and 8, performing direct current conversion by taking the minimum stress point moment as the turn-off moment of the switching tube Q7.
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| CN202111463815.XA CN114236335B (en) | 2021-12-02 | 2021-12-02 | DC conversion module switching tube voltage stress detection circuit and control method thereof |
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| CN202111463815.XA CN114236335B (en) | 2021-12-02 | 2021-12-02 | DC conversion module switching tube voltage stress detection circuit and control method thereof |
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| CN114236335B true CN114236335B (en) | 2023-07-18 |
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| CN113394996A (en) * | 2021-06-07 | 2021-09-14 | 深圳威迈斯新能源股份有限公司 | AC-DC resonant conversion circuit and control method thereof |
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2021
- 2021-12-02 CN CN202111463815.XA patent/CN114236335B/en active Active
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| US7778046B1 (en) * | 2008-12-17 | 2010-08-17 | Slobodan Cuk | Voltage step-up switching DC-to-DC converter field of the invention |
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| CN104167948A (en) * | 2014-09-11 | 2014-11-26 | 上海理工大学 | Variable-frequency soft switching control method of micro photovoltaic grid-connected inverter |
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