CN112134259A - Active switching device circuit and power electronic equipment - Google Patents
Active switching device circuit and power electronic equipment Download PDFInfo
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- CN112134259A CN112134259A CN202011099680.9A CN202011099680A CN112134259A CN 112134259 A CN112134259 A CN 112134259A CN 202011099680 A CN202011099680 A CN 202011099680A CN 112134259 A CN112134259 A CN 112134259A
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- switching device
- circuit
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- diode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
- H02H7/1206—Circuits independent of the type of conversion specially adapted to conversion cells composed of a plurality of parallel or serial connected elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses an active switching device circuit and power electronic equipment, which comprise an inductor L1 and a switching device Q1 which are sequentially connected between a power supply Vcc and the ground in series, and a follow current circuit connected with an inductor L1 in parallel; a first electrode terminal of the switching device Q1 is connected to the inductor L1, a second electrode terminal of the switching device Q1 is grounded, and a control terminal of the switching device Q1 is configured to receive a control signal to turn off or on; the short-circuit protection circuit is also included; the short-circuit protection circuit is configured to remove the switching device Q1 from the active switching device circuit in the event of a failure of the switching device Q1 to normally turn off. According to the short-circuit protection circuit, the fault loop can be quickly cut off, and the problem of circuit failure caused by self short-circuit failure of an active switch device or abnormal control signals is avoided.
Description
Technical Field
The present application relates to the field of power electronics, and in particular, to an active switching device circuit and power electronics.
Background
An active switching device circuit as shown in fig. 1 includes an inductor L1 and a switching device Q1 connected in series between a power supply Vcc and ground in that order, and a freewheel circuit connected in parallel with an inductor L1.
As shown in fig. 2, for the active switching device circuit shown in fig. 1, in order to improve the application reliability of the active switching device in some important applications (e.g., field control, safety control, etc.), two switching devices (shown as Q1 and Q2 in the figure) are generally connected in series in the circuit to provide redundancy, and the two switching devices are required to be selected from different manufacturers as much as possible to avoid device consistency failure.
Although this process can effectively provide the reliability of the hardware circuit, since the control signals are of the same source, if the control signals are abnormal (e.g., continuously turned on), a situation occurs in which neither of the switching devices can be turned off, thereby creating a circuit application risk.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an active switching device circuit and a power electronic device, so as to solve the problem of circuit failure caused by short circuit failure of the active switching device itself or abnormal control signal.
The technical scheme adopted by the application for solving the technical problems is as follows:
one aspect of the present application provides an active switching device circuit, including an inductor L1 and a switching device Q1 connected in series between a power supply Vcc and ground in this order, and a freewheel circuit connected in parallel with an inductor L1;
a first electrode terminal of the switching device Q1 is connected to the inductor L1, a second electrode terminal of the switching device Q1 is grounded, and a control terminal of the switching device Q1 is configured to receive a control signal to turn off or on;
the active switching device circuit further comprises a short-circuit protection circuit; the short-circuit protection circuit is configured to remove the switching device Q1 from the active switching device circuit in the event of a failure of the switching device Q1 to normally turn off.
Another aspect of the application provides a power electronic device comprising the active switching device circuit.
According to the active switching device circuit and the power electronic equipment, the fault loop can be quickly cut off through the short-circuit protection circuit, and the problem of circuit failure caused by self short-circuit failure of the active switching device or abnormal control signals is avoided.
Drawings
FIG. 1 is a circuit diagram of an active switching device of the prior art;
FIG. 2 is a schematic diagram of another prior art active switching device circuit;
fig. 3 is a schematic circuit diagram of an active switching device according to a first embodiment of the present application;
FIG. 4 is a schematic diagram of a freewheel circuit according to a first embodiment of the present application;
FIG. 5 is a schematic diagram of another freewheel circuit provided in the first embodiment of the present application;
fig. 6 is a schematic circuit diagram of an active switching device according to a second embodiment of the present application;
FIG. 7 is a schematic diagram of a freewheel circuit according to a second embodiment of the present application;
fig. 8 is a schematic diagram of another freewheel circuit according to a second embodiment of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 3, the first embodiment of the present application provides an active switching device circuit including an inductor L1 and a switching device Q1 connected in series between a power supply Vcc and ground in this order, and a freewheel circuit connected in parallel with an inductor L1;
a first electrode terminal of the switching device Q1 is connected to the inductor L1, a second electrode terminal of the switching device Q1 is grounded, and a control terminal of the switching device Q1 is configured to receive a control signal to turn off or on;
the active switching device circuit further comprises a short-circuit protection circuit; the short-circuit protection circuit is configured to remove the switching device Q1 from the active switching device circuit in the event of a failure of the switching device Q1 to normally turn off.
Specifically, the short-circuit protection circuit comprises a resistor R2, a diode D2, a capacitor C1 and a relay K1;
one end of the resistor R2 is connected to a power supply Vcc, and the other end is connected to the anode terminal of the diode D2 and the first electrode terminal of the switching device Q1; the cathode end of the diode D2 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded;
the control part of the relay K1 is connected in parallel with the capacitor C1, and the normally open contact of the relay K1 is connected between the inductor L1 and the first electrode terminal of the switching device Q1.
In the present example, the capacitor C1 is configured such that when the charging voltage on the capacitor C1 is greater than or equal to the starting voltage of the relay K1, the normally open contact of the relay K1 is conductive.
In the present example, the capacitor C1 is further configured such that when the switching device Q1 operates normally conductive, the minimum voltage value across the capacitor C1 is greater than the release voltage of the relay K1.
In the present example, the switching device Q1 is selected from one of an IGBT, a MOSFET, and a BJT.
The working principle of the active switching device circuit is illustrated below:
when the Vcc is electrified, the Vcc charges a capacitor C1 through a resistor R2 and a diode D2, and when the charging voltage on the capacitor C1 is greater than or equal to the starting voltage of the coil of the relay K1, the normally open contact of the relay K1 is conducted, and at the moment, the switching device Q1 can receive a control signal to normally work. When the switching device Q1 is normally controlled to be switched on or switched off according to PWM pulses, the capacitor C1 is continuously charged and discharged, and when the switching device Q1 works at the maximum duty ratio through reasonable circuit design (including reasonably selecting device parameters), the minimum voltage value on the capacitor C1 is only larger than the release voltage of a coil of the relay K1; when the switching device Q1 is short-circuited and fails or the driving signal is 100% duty ratio, the diode D2 is cut off, the capacitor C1 continuously discharges through the coil of the relay K1, and when the voltage of the capacitor C1 is smaller than the release voltage of the coil of the relay K1, the normally open contact of the relay K1 is opened, so that the loop is cut off.
Further, referring to fig. 4, the freewheel circuit of the active switching device circuit provided by the embodiment of the present application includes a diode D1; the diode D1 is connected in parallel with the inductor L1, and the cathode terminal of the diode D1 is connected to a power supply Vcc.
Further, referring to fig. 5, unlike fig. 4, the freewheel circuit of the active switching device circuit provided in the embodiment of the present application further includes a resistor R1 connected in series to the anode terminal of the diode D1.
Example 2
As shown in fig. 6, a second embodiment of the present application provides an active switching device circuit, which is different from fig. 3 in that: the short-circuit protection circuit comprises a resistor R2, a diode D2, a capacitor C1, a switching device Q2 and a resistor R3; one end of the resistor R2 is connected to a power source Vcc, and the other end is connected to the anode terminal of the diode D2, the second electrode terminal of the switching device Q2, and the first electrode terminal of the switching device Q1; a cathode terminal of the diode D2 is connected to one terminal of the capacitor C1, a control terminal of the switching device Q2, and one terminal of the resistor R3, and the other terminals of the capacitor C1 and the resistor R3 are grounded; a first electrode terminal of the switching device Q2 is connected to the inductor L1.
In this example, the capacitor C1 is configured such that the switching device Q2 conducts when the voltage across the capacitor C1 is greater than or equal to the activation voltage of the switching device Q2.
In this example, the capacitor C1 is further configured such that when the switching device Q1 operates normally on, the minimum voltage value across the capacitor C1 is greater than the starting voltage of the switching device Q2.
In this example, the switching device Q1 and the switching device Q2 are each selected from one of an IGBT, a MOSFET, and a BJT.
The operating principle of the exemplary active switching device circuit is explained below:
when the Vcc is powered up, the Vcc charges the capacitor C1 through the resistor R2 and the diode D2, and when the charging voltage on the capacitor C1 is greater than or equal to the starting voltage of the switching device Q2, the switching device Q2 is turned on, and the switching device Q1 can receive a control signal to operate normally. When the switching device Q1 is normally controlled to be switched on or switched off according to PWM pulses, the capacitor C1 is continuously charged and discharged, and when the capacitor C3526 works at the maximum duty ratio through reasonable circuit design (including reasonably selecting device parameters), the minimum voltage value on the capacitor C1 is only larger than the starting voltage of the switching device Q2; when the switching device Q1 is short-circuited or the driving signal is 100% duty cycle, the diode D2 is turned off, the capacitor C1 will continue to discharge automatically through the resistor R3, and when the voltage of the capacitor C1 is smaller than the starting voltage of the switching device Q2, the switching device Q2 is turned off, so as to cut off the loop.
Further, referring to fig. 7, the freewheel circuit of the active switching device circuit provided by the embodiment of the present application includes a diode D1; the diode D1 is connected in parallel with the inductor L1, and the cathode terminal of the diode D1 is connected to a power supply Vcc.
Further, referring to fig. 8, unlike fig. 7, the freewheel circuit of the active switching device circuit provided in the embodiment of the present application further includes a resistor R1 connected in series to the anode terminal of the diode D1.
Example 3
A third embodiment of the present application provides a power electronic device including the active switching device circuit described in the first embodiment or the second embodiment.
In this example, the power electronics include, but are not limited to, a frequency converter.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not intended to limit the scope of the claims of the application accordingly. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present application are intended to be within the scope of the claims of the present application.
Claims (10)
1. An active switching device circuit includes an inductor L1 and a switching device Q1 connected in series between a power supply Vcc and ground in this order, and a freewheel circuit connected in parallel with the inductor L1;
a first electrode terminal of the switching device Q1 is connected to the inductor L1, a second electrode terminal of the switching device Q1 is grounded, and a control terminal of the switching device Q1 is configured to receive a control signal to turn off or on; it is characterized in that the preparation method is characterized in that,
the active switching device circuit further comprises a short-circuit protection circuit; the short-circuit protection circuit is configured to remove the switching device Q1 from the active switching device circuit in the event of a failure of the switching device Q1 to normally turn off.
2. The active switching device circuit of claim 1, wherein the short protection circuit comprises a resistor R2, a diode D2, a capacitor C1, and a relay K1;
one end of the resistor R2 is connected to a power supply Vcc, and the other end is connected to the anode terminal of the diode D2 and the first electrode terminal of the switching device Q1; the cathode end of the diode D2 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded;
the control part of the relay K1 is connected in parallel with the capacitor C1, and the normally open contact of the relay K1 is connected between the inductor L1 and the first electrode terminal of the switching device Q1.
3. The active switching device circuit of claim 2, wherein the capacitor C1 is configured such that the normally open contact of the relay K1 is conductive when the charging voltage on the capacitor C1 is greater than or equal to the activation voltage of the relay K1.
4. The active switching device circuit of claim 3, wherein the capacitor C1 is further configured such that when the switching device Q1 operates normally conductive, the minimum voltage value across the capacitor C1 is greater than the release voltage of the relay K1.
5. The active switching device circuit of claim 1, wherein the short protection circuit comprises a resistor R2, a diode D2, a capacitor C1, a switching device Q2, and a resistor R3;
one end of the resistor R2 is connected to a power source Vcc, and the other end is connected to the anode terminal of the diode D2, the second electrode terminal of the switching device Q2, and the first electrode terminal of the switching device Q1; a cathode terminal of the diode D2 is connected to one terminal of the capacitor C1, a control terminal of the switching device Q2, and one terminal of the resistor R3, and the other terminals of the capacitor C1 and the resistor R3 are grounded; a first electrode terminal of the switching device Q2 is connected to the inductor L1.
6. The active switching device circuit of claim 5, wherein the capacitor C1 is configured such that the switching device Q2 is conductive when the voltage across the capacitor C1 is greater than or equal to the turn-on voltage of the switching device Q2.
7. The active switching device circuit of claim 6, wherein the capacitor C1 is further configured such that when the switching device Q1 operates normally conductive, the minimum voltage value across the capacitor C1 is greater than the start voltage of the switching device Q2.
8. An active switching device circuit as claimed in any one of claims 1 to 7 wherein said free wheeling circuit includes a diode D1;
the diode D1 is connected in parallel with the inductor L1, and the cathode terminal of the diode D1 is connected to a power supply Vcc.
9. The active switching device circuit of claim 8, wherein the freewheeling circuit further comprises a resistor R1 connected in series with the anode terminal of the diode D1.
10. A power electronic device comprising an active switching device circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099680.9A CN112134259A (en) | 2020-10-15 | 2020-10-15 | Active switching device circuit and power electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099680.9A CN112134259A (en) | 2020-10-15 | 2020-10-15 | Active switching device circuit and power electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN112134259A true CN112134259A (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011099680.9A Pending CN112134259A (en) | 2020-10-15 | 2020-10-15 | Active switching device circuit and power electronic equipment |
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| CN (1) | CN112134259A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113238592A (en) * | 2021-05-25 | 2021-08-10 | 立铠精密科技(盐城)有限公司 | Temperature control device and temperature control method |
-
2020
- 2020-10-15 CN CN202011099680.9A patent/CN112134259A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113238592A (en) * | 2021-05-25 | 2021-08-10 | 立铠精密科技(盐城)有限公司 | Temperature control device and temperature control method |
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