CN106505843B - The intrinsically safe circuit of Switching Power Supply - Google Patents
The intrinsically safe circuit of Switching Power Supply Download PDFInfo
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- CN106505843B CN106505843B CN201611137298.6A CN201611137298A CN106505843B CN 106505843 B CN106505843 B CN 106505843B CN 201611137298 A CN201611137298 A CN 201611137298A CN 106505843 B CN106505843 B CN 106505843B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The disclosure is directed to a kind of intrinsically safe circuit of Switching Power Supply, which includes: overvoltage self-locking circuit and supplies that circuit is electrically cut off；Wherein, the output terminals A 1 of the overvoltage self-locking circuit is connected with the input terminal B1 for circuit is electrically cut off；The output terminals A 2 of the overvoltage self-locking circuit is connected with the input terminal B2 for circuit is electrically cut off；The overvoltage self-locking circuit is used in the input voltage of the overvoltage self-locking circuit be more than the first preset threshold, and the output terminals A 1 of overvoltage self-locking circuit be predeterminated voltage when, the output terminals A 2 for controlling the overvoltage self-locking circuit becomes the predeterminated voltage from 0V, and maintains the predeterminated voltage；It is described for be electrically cut off circuit for for circuit is electrically cut off input terminal B1 and it is described be the predeterminated voltage for the input terminal B2 that is electrically cut off circuit when, controlling described for the output end of circuit is electrically cut off is zero.The disclosure can prevent the explosion of Switching Power Supply.
Description
Technical Field
The present disclosure relates to the field of power electronics, and more particularly, to an explosion-proof circuit for a switching power supply.
Background
With the rapid development of power electronic technology, switching power supplies have been widely used in various industries, such as computers, communications, industrial processing, aviation, and other fields.
In the related technology, the valve is opened due to overvoltage of the Main electrolytic capacitor, so that the whole machine is more and more in a fire phenomenon due to ignition of electrolyte after the valve is opened, although a Power Factor Correction (PFC) circuit provides an OVP (Over Voltage Protection) function of a chip, the OVP circuit has failure risk in a complex working environment of the PFC chip, experimental data show that the OVP circuit of the PFC chip has feedback open loop failure in a high-temperature and humid environment, because the PFC OVP circuit and a PFC Voltage (Main electrolytic capacitor Voltage) control circuit are the same circuit, the Main electrolytic capacitor Voltage continuously rises until the explosion-proof valve is opened after the feedback circuit fails, and a fire disaster occurs due to high Power and high organic rate after the PFC chip is opened.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides an explosion-proof circuit of a switching power supply.
According to a first aspect of the embodiments of the present disclosure, there is provided an explosion-proof circuit of a switching power supply, including: an overvoltage self-locking circuit and a power supply cut-off circuit; wherein,
the output end A1 of the overvoltage self-locking circuit is connected with the input end B1 of the power supply cut-off circuit; the output end A2 of the overvoltage self-locking circuit is connected with the input end B2 of the power supply cut-off circuit;
the overvoltage self-locking circuit is used for controlling the output end A2 of the overvoltage self-locking circuit to be changed from 0V to the preset voltage and to be maintained at the preset voltage when the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold and the output end A1 of the overvoltage self-locking circuit is the preset voltage;
and the power supply cut-off circuit is used for controlling the output end of the power supply cut-off circuit to be zero when the input end B1 of the power supply cut-off circuit and the input end B2 of the power supply cut-off circuit are both the preset voltage.
When the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value, the output end of the power supply cut-off circuit is zero, namely all power transmission lines are controlled to stop working, so that no energy is transmitted in the whole circuit, and the explosion of the switching power supply can be prevented.
Optionally, the overvoltage self-locking circuit comprises a trigger module, a voltage division module, a first switch module and a self-locking module; wherein,
the first end of the voltage division module is connected with the trigger module, and the second end of the voltage division module is respectively connected with the first end of the first switch module and the first end of the self-locking module;
the second end of the self-locking module is connected with the second end of the first switch module, and the first output end of the first switch module is used as the output end A1 of the overvoltage self-locking circuit, and the second output end of the first switch module is used as the output end A2 of the overvoltage self-locking circuit;
the voltage division module is used for carrying out voltage division processing on the voltage output by the trigger module;
the first switch module is used for switching on the self-locking module when the voltage output by the voltage division module is greater than a second preset threshold value;
the self-locking module is used for controlling the first switch module to be in a switch-on state when the voltage output by the voltage dividing module is greater than a second preset threshold value.
Because the overvoltage self-locking circuit comprises the trigger module, the voltage division module, the first switch module and the self-locking module, after the voltage division module divides the voltage output by the trigger module, the first switch module is controlled to be in a conducting state, so that the self-locking module is in a self-locking state, and the reliability of the switch power supply explosion-proof circuit can be improved.
Optionally, the power supply cutoff circuit includes a second switch module, a third switch module, and a fourth switch module; wherein,
the first end of the second switch module is connected with the second end of the third switch module, the first end of the second switch module is used as the input end B1 of the power supply cut-off circuit, the second end of the second switch module is used as the input end B2 of the power supply cut-off circuit, and the third end of the second switch module is connected with the third end of the third switch module;
the first end of the third switch module is connected with the first end of the fourth switch module, and the first end of the third switch module is connected with an external power supply;
a second end of the fourth switch module is used as an output end of the power supply cut-off circuit, and a third end of the fourth switch module is connected with the external power supply;
the second switch module is used for controlling the third switch module to be turned off when the input end B2 of the power supply cut-off circuit is a preset voltage;
the third switching module is used for controlling the fourth switching module to be switched off when the third switching module is switched off;
and the fourth switching module is used for controlling the output end of the power supply cut-off circuit to be zero when the fourth switching module is switched off.
Since the power supply cutoff circuit includes the second switch module, the third switch module, and the fourth switch module, when the second switch module is in the on state, the third switch module and the fourth switch module will be in the off state, so that the output voltage of the power supply cutoff circuit is 0, thereby preventing the explosion of the switching power supply.
Optionally, the power supply cut-off circuit further includes a protection module, a first end of the protection module is connected to the input end B2 of the power supply cut-off circuit, and a second end of the protection module is connected to the second end of the second switch module.
Since the protection module is used for preventing false triggering and current limiting, the reliability of the power supply cut-off circuit can be improved.
Optionally, the trigger module comprises an electrolytic capacitor, and the voltage dividing module comprises a first resistor and a second resistor; wherein,
the anode of the electrolytic capacitor is connected with the first end of the first resistor, and the cathode of the electrolytic capacitor is grounded;
the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded.
Optionally, the first switch module includes a regulator, a first capacitor, a second capacitor, a third resistor, a fourth resistor, and a first transistor; wherein,
the first end of the voltage stabilizing regulator is respectively connected with the second end of the first resistor and the first end of the first capacitor, the second end of the voltage stabilizing regulator is connected with the first end of the third resistor, and the third end of the voltage stabilizing regulator is connected with the second end of the first capacitor and grounded;
the first capacitor is connected with the second resistor in parallel;
the first triode is a PNP triode, a base electrode of the first triode is respectively connected with the second end of the third resistor, a collector electrode of the first triode, a first end of the fourth resistor and a first end of the second capacitor, and a connection point is used as a second output end of the first switch module;
and the emitter of the first triode is respectively connected with the second end of the fourth resistor, the second end of the second capacitor and an external power supply, and the connection point is used as the first output end of the first switch module.
Optionally, the self-locking module comprises a first diode and a fifth resistor; wherein,
the anode of the first diode is connected with the base electrode of the first triode, and the cathode of the first diode is connected with the first end of the fifth resistor;
and the second end of the fifth resistor is connected with the first end of the voltage stabilizing regulator.
Optionally, the protection module includes a false triggering protection device; the second switch module includes: the third capacitor, the sixth resistor, the seventh resistor, the eighth resistor, the second triode and the second diode; wherein,
a first end of the false triggering protection device is used as an input end B2 of the power supply cut-off circuit, and a second end of the false triggering protection device is respectively connected with a first end of the third capacitor, a first end of the sixth resistor and a base electrode of the second triode;
the third capacitor and the sixth resistor are connected in parallel, and a second end of the third capacitor and a second end of the sixth resistor are both grounded;
the second triode is an NPN type triode, an emitting electrode of the second triode is grounded, and a collector electrode of the second triode is connected with the first end of the seventh resistor;
the second end of the seventh resistor is connected with the cathode of the second diode, the anode of the second diode is connected with the first end of the eighth resistor, and the connection point is connected with an external power supply;
a second terminal of the eighth resistor serves as an input terminal B1 of the power supply cutoff circuit.
Optionally, the third switching module comprises: a ninth resistor, a tenth resistor and a third triode; wherein,
a first end of the ninth resistor is respectively connected with a first end of the seventh resistor and a base electrode of the third triode, and a second end of the ninth resistor is connected with an emitting electrode of the third triode and grounded;
the third triode is an NPN type triode, and a collector of the third triode is connected with the first end of the tenth resistor.
Optionally, the fourth switching module comprises: the fourth capacitor, the eleventh resistor and the fourth triode; wherein,
the fourth triode is a PNP type triode, the base of the fourth triode is respectively connected with the second end of the tenth resistor, the first end of the fourth capacitor and the first end of the eleventh resistor, the emitting electrode of the fourth triode is respectively connected with the second end of the fourth capacitor and the second end of the eleventh resistor, the connecting point is connected with an external power supply, and the collecting electrode of the fourth triode is used as the output end of the power supply cut-off circuit.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the explosion-proof circuit of the switching power supply comprises an overvoltage self-locking circuit and a power supply cut-off circuit, wherein an output end A1 of the overvoltage self-locking circuit is connected with an input end B1 of the power supply cut-off circuit, an output end A2 of the overvoltage self-locking circuit is connected with an input end B2 of the power supply cut-off circuit, the overvoltage self-locking circuit is used for controlling an output end A2 of the overvoltage self-locking circuit to be changed from 0V to a preset voltage and to be maintained at the preset voltage when an input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value and an output end A1 of the overvoltage self-locking circuit is the preset voltage, and the power supply cut-off circuit is used for controlling an output end of the power supply cut-off circuit to be zero when an input end B1 of the power supply cut-off circuit and. When the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value, the output end of the power supply cut-off circuit is zero, namely all power transmission lines are controlled to stop working, so that no energy is transmitted in the whole circuit, and the explosion of the switching power supply can be prevented.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic configuration diagram illustrating an explosion-proof circuit of a switching power supply according to an exemplary embodiment;
fig. 2 is a schematic configuration diagram of an explosion-proof circuit of a switching power supply according to another exemplary embodiment;
FIG. 3 is a schematic diagram of the structure of the over-voltage self-locking circuit;
fig. 4 is a schematic configuration diagram showing an explosion-proof circuit of a switching power supply according to still another exemplary embodiment;
fig. 5 is a schematic configuration diagram showing an explosion-proof circuit of a switching power supply according to still another exemplary embodiment;
fig. 6 is a schematic diagram of the power supply cutoff circuit.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic structural diagram illustrating an explosion-proof circuit of a switching power supply according to an exemplary embodiment. As shown in fig. 1, the explosion-proof circuit 10 of the switching power supply includes: an overvoltage self-locking circuit 101 and a power supply cut-off circuit 102; wherein, the output end (A1) of the overvoltage self-locking circuit 101 is connected with the input end (B1) of the power supply cut-off circuit 102; the output (A2) of the over-voltage self-locking circuit 101 is connected with the input (B2) of the power supply cut-off circuit 102.
The overvoltage self-locking circuit 101 is configured to control the output terminal (a2) of the overvoltage self-locking circuit 101 to be changed from 0V to a preset voltage and maintain the preset voltage when the input voltage of the overvoltage self-locking circuit 101 exceeds a first preset threshold and the output terminal (a1) of the overvoltage self-locking circuit is the preset voltage. The power supply cutoff circuit 102 is configured to control the output terminal of the power supply cutoff circuit 102 to be zero when both the input terminal (B1) of the power supply cutoff circuit 102 and the input terminal (B2) of the power supply cutoff circuit 102 are preset voltages.
Specifically, after the input voltage of the overvoltage self-locking circuit 101 is overvoltage, that is, the input voltage of the overvoltage self-locking circuit 101 exceeds a first preset threshold, the voltage values of the output end (a1) and the output end (a2) of the overvoltage self-locking circuit 101 are controlled to be equal, and since the output end (a1) of the overvoltage self-locking circuit 101 is connected to the external power supply, the voltage of the output end (a1) of the overvoltage self-locking circuit 101 is maintained at the preset voltage value, and then the voltage of the output end (a2) of the overvoltage self-locking circuit 101 is changed from 0V to the preset voltage value and is maintained at the preset voltage value. The preset voltage value may be selected according to an actual situation, for example, may be 5V to 30V, and the specific value of the preset voltage value is not limited herein.
Because the output end (A1) of the over-voltage self-locking circuit 101 is connected with the input end (B1) of the power supply cut-off circuit 102, and the output end (A2) of the over-voltage self-locking circuit 101 is connected with the input end (B2) of the power supply cut-off circuit 102, when the output end (A1) of the over-voltage self-locking circuit 101 is at the preset voltage and the output end (A2) is changed from 0V to the preset voltage, the input end (B1) of the power supply cut-off circuit 102 is at the preset voltage and the input end (B2) is also changed from 0V to the preset voltage, at the moment, the power supply cut-off circuit 102 controls the output end of the power supply cut-off circuit 102 to be 0, namely all power transmission lines are controlled to stop working, and thus, no energy is transmitted in.
The explosion-proof circuit of the switching power supply comprises an overvoltage self-locking circuit and a power supply cut-off circuit, wherein an output end (A1) of the overvoltage self-locking circuit is connected with an input end (B1) of the power supply cut-off circuit, an output end (A2) of the overvoltage self-locking circuit is connected with an input end (B2) of the power supply cut-off circuit, the overvoltage self-locking circuit is used for controlling the output end (A2) of the overvoltage self-locking circuit to be changed from 0V to a preset voltage and to be maintained at the preset voltage when an input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value and the output end (A1) of the overvoltage self-locking circuit is the preset voltage, and the power supply cut-off circuit is used for controlling the output end of the power supply cut-off circuit to be zero when the input end (B1) of the power supply cut-off. When the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value, the output end of the power supply cut-off circuit is zero, namely all power transmission lines are controlled to stop working, so that no energy is transmitted in the whole circuit, and the explosion of the switching power supply can be prevented.
Fig. 2 is a schematic structural diagram of an explosion-proof circuit of a switching power supply according to another exemplary embodiment. As shown in fig. 2, in this embodiment, based on the embodiment shown in fig. 1, the overvoltage self-locking circuit 101 includes a trigger module 101A, a voltage dividing module 101B, a first switch module 101C, and a self-locking module 101D; the first end of the voltage dividing module 101B is connected to the trigger module 101A, the second end of the voltage dividing module 101B is connected to the first end of the first switch module 101C and the first end of the self-locking module 101D, the second end of the self-locking module 101D is connected to the second end of the first switch module 101C, the first output end of the first switch module 101C is used as the output end (a1) of the overvoltage self-locking circuit 101, and the second output end of the first switch module 101C is used as the output end (a2) of the overvoltage self-locking circuit 101.
The voltage dividing module 101B is configured to divide the voltage output by the trigger module 101A; the first switch module 101C is configured to switch on the self-locking module 101D when the voltage output by the voltage dividing module 101B is greater than a second preset threshold; the self-locking module 101D is configured to control the first switch module 101C to be in an on state when the voltage output by the voltage dividing module 101B is greater than a second preset threshold.
Specifically, the triggering module 101A includes an electrolytic capacitor, after the voltage of the electrolytic capacitor is abnormally increased, the voltage of the electrolytic capacitor is divided by the voltage dividing module 101B, and the divided voltage is input to the first switch module 101C, when the voltage output by the voltage dividing module 101B is greater than a second preset threshold, the first switch module 101C is turned on, at this time, the first output terminal of the first switch module 101C will be equal to the voltage of the second output terminal, and since the first output terminal is connected to the external power supply, the voltage of the second output terminal will be changed from 0V to the voltage provided by the external power supply, for example, 12V or the like.
Since the self-locking module 101D is connected to the second output terminal of the first switch module 101C, the self-locking module 101D is in an on state, and when the voltage output by the voltage dividing module 101B is greater than the second preset threshold, the first switch module is controlled to be in the on state, so that the second output terminal of the first switch module 101C, that is, the output terminal (a2) of the overvoltage self-locking circuit 101C can be maintained at the preset voltage. When the output end (A2) of the overvoltage self-locking circuit 101 is maintained at the preset voltage, the output end of the power supply cut-off circuit can be controlled to be zero, namely all power transmission lines are controlled to stop working, so that no energy is transmitted in the whole circuit, and the explosion of the switching power supply can be prevented.
Optionally, on the basis of the foregoing embodiment, fig. 3 is a schematic structural diagram of the overvoltage self-locking circuit, as shown in fig. 3, the trigger module 101A includes an electrolytic capacitor E1 and an electrolytic capacitor E2, and an electrolytic capacitor E1 and an electrolytic capacitor E2 are connected in parallel, the voltage dividing module 101B includes a first resistor and a second resistor, where the first resistor includes a resistor R34, a resistor R38, a resistor R34A, and a resistor R33A, and the resistor R34, the resistor R38, the resistor R34A, and the resistor R33A are connected in series, the second resistor includes a resistor R32A and a resistor R31A, and the resistor R32A and the resistor R31A are connected in parallel. The anodes of the electrolytic capacitor E1 and the electrolytic capacitor E2 are connected to the first terminal of the first resistor, the cathode is grounded, the second terminal of the first resistor is connected to the first terminal of the second resistor, and the second terminal of the second resistor is grounded.
After the voltages of the electrolytic capacitor E1 and the electrolytic capacitor E2 are abnormally increased, the divided voltages are applied to the first switch module 101C through the resistor R34, the resistor R38, the resistor R34A, and the resistor R33A. The first switch module 101C includes a regulator IC801, a first capacitor C34, a second capacitor C30, a third resistor R30A, a fourth resistor 39A, and a first transistor Q31, wherein a first end (R) of the regulator IC801 is connected to a second end of the first resistor and a first end of the first capacitor C34, respectively, a second end (K) of the regulator IC801 is connected to a first end of the third resistor R30A, and a third end (a) of the regulator IC801 is connected to a second end of the first capacitor C34 and grounded; the first capacitor C34 is connected in parallel with the second resistor; the first triode Q31 is a PNP triode, the base of the first triode Q31 is connected to the second end of the third resistor R30A, the collector of the first triode Q31, the first end of the fourth resistor 39A, and the first end of the second capacitor C30, respectively, and the connection point is used as the second output end of the first switch module, i.e., the output end (a2) of the overvoltage self-locking circuit; the emitter of the first triode Q31 is connected to the second end of the fourth resistor 39A, the second end of the second capacitor C30 and the external power supply respectively, and the connection point is used as the first output end of the first switch module, i.e. the output end (a1) of the overvoltage self-locking circuit.
Alternatively, the voltage regulator IC801 may be of the type TI 431. After the voltage dividing module 101B divides the voltage, the divided voltage is input to the terminal R of the regulator IC801, and according to the characteristics of the regulator IC801, if the voltage at the terminal R exceeds a first preset threshold, K, A of the regulator IC801 is turned on, where the first preset threshold may be, for example, 1.25V or 2.5V. When K, A of the regulator IC801 is turned on, the collector and the emitter of the first transistor Q31 are saturated and turned on, and the voltage of the first output terminal and the voltage of the second output terminal of the first switching module 101C are equal. Since the first output terminal is connected to the external power supply, wherein the external power supply will provide 5-30V dc voltage, the voltage of the second output terminal will change from 0V to 5-30V dc voltage.
It should be noted that, as shown in fig. 3, the first capacitor C34 may be used to prevent the K, A of the regulator IC801 from being turned on by mistake, and the second capacitor C30 may be used to prevent the collector and emitter of the transistor Q31 from being turned on by mistake.
The self-locking module 101D comprises a first diode D33 and a fifth resistor R35A, wherein the anode of the first diode D33 is connected with the base of the first transistor Q31, and the cathode of the first diode D33 is connected with the first end of the fifth resistor R35A; the second terminal of the fifth resistor R35A is connected to the first terminal (R) of the regulator IC 801.
Since the voltage at the second output terminal of the first switch module 101C is dc voltage of 5-30V, the first diode D33 of the self-locking module 101D will be turned on, so that the voltage at the regulated regulator IC801R of the first switch module 101C will always exceed the first predetermined threshold, and thus K, A of the regulated regulator IC801 will always be in a conducting state, so as to achieve the self-locking function.
The explosion-proof circuit of the switching power supply comprises an overvoltage self-locking circuit and a power supply cut-off circuit, wherein an output end (A1) of the overvoltage self-locking circuit is connected with an input end (B1) of the power supply cut-off circuit, an output end (A2) of the overvoltage self-locking circuit is connected with an input end (B2) of the power supply cut-off circuit, the overvoltage self-locking circuit is used for controlling the output end (A2) of the overvoltage self-locking circuit to be changed from 0V to a preset voltage and to be maintained at the preset voltage when an input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value and the output end (A1) of the overvoltage self-locking circuit is the preset voltage, and the power supply cut-off circuit is used for controlling the output end of the power supply cut-off circuit to be zero when the input end (B1) of the power supply cut-off. When the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value, the output end of the power supply cut-off circuit is zero, namely all power transmission lines stop working, so that no energy is transmitted in the whole circuit, and the explosion of the switching power supply can be prevented. In addition, because the overvoltage self-locking circuit comprises the trigger module, the voltage division module, the first switch module and the self-locking module, after the voltage division module divides the voltage output by the trigger module, the first switch module is controlled to be in a conducting state, so that the self-locking module is in a self-locking state, and the reliability of the switch power supply explosion-proof circuit can be improved.
Fig. 4 is a schematic structural diagram illustrating an explosion-proof circuit of a switching power supply according to still another exemplary embodiment. As shown in fig. 4, in the present embodiment, on the basis of the above embodiments, the power supply cutoff circuit 102 includes a second switch module 102A, a third switch module 102B, and a fourth switch module 102C; wherein, the first terminal of the second switch module 102A is connected to the second terminal of the third switch module 102B, the first terminal of the second switch module 102A is used as the input terminal (B1) of the power supply cut-off circuit 102, the second terminal of the second switch module 102A is used as the input terminal (B2) of the power supply cut-off circuit 102, and the third terminal of the second switch module 102A is connected to the third terminal of the third switch module 102B; a first end of the third switch module 102B is connected to a first end of the fourth switch module 102C, and a first end of the third switch module 102B is connected to an external power supply; a second terminal of the fourth switch module 102C is used as an output terminal of the power supply cut-off circuit 102, and a third terminal of the fourth switch module 102C is connected to an external power supply.
The second switch module 102A is configured to control the third switch module 102B to turn off when an input terminal (B2) of the power supply cutoff circuit 102 is a preset voltage; the third switching module 102B is configured to control the fourth switching module 102C to turn off when the third switching module 102B turns off; the fourth switching module 102C is configured to control the output end of the power supply cut-off circuit 102 to be zero when the fourth switching module 102C is turned off.
Specifically, when the voltage of the second output terminal of the first switch module 101C is changed from 0V to a preset voltage, the second switch module 102A will be in an on state, so that the third switch module 102B will be controlled to be in an off state, when the third switch module 102B is in the off state, the fourth switch tube 102C will be controlled to be in the off state, since the second terminal of the fourth switch tube 102C is the output terminal of the power supply cut-off circuit 102, when the fourth switch tube 102C is in the off state, the voltage of the output terminal of the power supply cut-off circuit 102 will be 0, that is, all power transmission lines will stop working, so that no energy is transmitted in the whole circuit, and thus explosion of the switching power supply can be prevented.
Alternatively, fig. 5 is a schematic structural diagram of an explosion-proof circuit of a switching power supply according to yet another exemplary embodiment, and as shown in fig. 5, the power supply cutoff circuit 102 further includes a protection module 102D, a first end of the protection module 102D is connected to the input end (B2) of the power supply cutoff circuit 102, and a second end of the protection module 102D is connected to the second end of the second switching module 102A. The protection module 102D may be, for example, a false triggering protection device, and the protection module 102D is used to prevent false triggering and current limiting, so that the reliability of the power supply cutoff circuit 102 may be improved.
Optionally, on the basis of the foregoing embodiment, fig. 6 is a schematic structural diagram of the power supply cut-off circuit, and as shown in fig. 6, the protection module 102D includes a false triggering protection device P for preventing false triggering and limiting current, and the second switching module 102A includes a third capacitor C31, a sixth resistor R37A, a seventh resistor R38A, an eighth resistor R29A, a second transistor Q32 and a second diode D34, where a first end of the false triggering protection device P is used as an input end (B2) of the power supply cut-off circuit, and a second end of the false triggering protection device P is connected to the first end of the third capacitor C31, the first end of the sixth resistor R37A and the base of the second transistor Q32, respectively; the third capacitor C31 and the sixth resistor R37A are connected in parallel, and the second end of the third capacitor C31 and the second end of the sixth resistor R37A are both grounded; the second triode Q32 is an NPN type triode, the emitter of the second triode Q32 is grounded, and the collector of the second triode Q32 is connected with the first end of the seventh resistor R38A; a second end of the seventh resistor R38A is connected to a cathode of the second diode D34, an anode of the second diode D34 is connected to a first end of the eighth resistor R29A, and a connection point is connected to an external power supply; the second terminal of the eighth resistor R29A serves as the input terminal (B1) of the power supply cutoff circuit.
After the voltage of the second output terminal of the first switch module 101C in the over-voltage self-locking circuit 101 is changed from 0V to a preset voltage, the voltage of the base of the second transistor Q32 is also changed from 0V to a preset voltage, at this time, the collector and the emitter of the second transistor Q32 are in saturation conduction, in addition, the third capacitor C31 is used for preventing the collector and the emitter of the second transistor Q32 from being in false conduction, the sixth resistor R37A and the seventh resistor R38A are used for limiting current to protect the second transistor Q32, and the second diode D34 is used for preventing the back-filling current from flowing into the second transistor Q32 to achieve the effect of protecting the second transistor Q32.
The third switching module 102B comprises a ninth resistor, a tenth resistor R27A and a third transistor Q33, the ninth resistor comprises a resistor R25A and a resistor R26A, and the resistor R25A and the resistor R26A are connected in parallel, wherein a first end of the ninth resistor (R25A and R26A) is connected to a first end of the seventh resistor R38A and a base of the third transistor Q33, respectively, and a second end of the ninth resistor (R25A and R26A) is connected to an emitter of the third transistor Q33 and grounded; the third transistor Q33 is an NPN transistor, and a collector of the third transistor Q33 is connected to a first end of the tenth resistor R27A.
When the collector and emitter of the transistor Q32 are in the saturation conducting state, the collector and emitter of the transistor Q33 will be in the cut-off state, and in addition, R25A, resistor R26A, and resistor R27A are used to limit current to protect the transistor Q33.
The fourth switching module 102C includes a fourth capacitor C32, an eleventh resistor R28A, and a fourth transistor Q34, wherein the fourth transistor Q34 is a PNP transistor, a base of the fourth transistor Q34 is connected to the second end of the tenth resistor R27A, the first end of the fourth capacitor C32, and the first end of the eleventh resistor R28A, an emitter of the fourth transistor Q34 is connected to the second end of the fourth capacitor C32 and the second end of the eleventh resistor R28A, respectively, and a connection point is connected to an external power source, and a collector of the fourth transistor Q34 serves as an output terminal of the power supply cutoff circuit.
When the collector and the emitter of the transistor Q33 are in the off state, the collector and the emitter of the transistor Q34 are also in the off state, and at this time, the voltages of the resonant circuit LLC and PFC are 0, that is, the whole circuit will stop working, so that there is no energy transmission in the whole circuit, and thus the explosion of the switching power supply can be prevented.
The explosion-proof circuit of the switching power supply comprises an overvoltage self-locking circuit and a power supply cut-off circuit, wherein an output end (A1) of the overvoltage self-locking circuit is connected with an input end (B1) of the power supply cut-off circuit, an output end (A2) of the overvoltage self-locking circuit is connected with an input end (B2) of the power supply cut-off circuit, the overvoltage self-locking circuit is used for controlling the output end (A2) of the overvoltage self-locking circuit to be changed from 0V to a preset voltage and to be maintained at the preset voltage when an input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value and the output end (A1) of the overvoltage self-locking circuit is the preset voltage, and the power supply cut-off circuit is used for controlling the output end of the power supply cut-off circuit to be zero when the input end (B1) of the power supply cut-off. When the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold value, the output end of the power supply cut-off circuit is zero, namely all power transmission lines stop working, so that no energy is transmitted in the whole circuit, and the explosion of the switching power supply can be prevented. In addition, since the power supply cutoff circuit includes the second switch module, the third switch module, and the fourth switch module, when the second switch module is in the on state, the third switch module and the fourth switch module will be in the off state, so that the output voltage of the power supply cutoff circuit is 0, thereby preventing the explosion of the switching power supply.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. An explosion-proof circuit of a switching power supply, comprising: an overvoltage self-locking circuit and a power supply cut-off circuit; wherein,
the output end A1 of the overvoltage self-locking circuit is connected with the input end B1 of the power supply cut-off circuit; the output end A2 of the overvoltage self-locking circuit is connected with the input end B2 of the power supply cut-off circuit;
the overvoltage self-locking circuit is used for controlling the output end A2 of the overvoltage self-locking circuit to be changed from 0V to the preset voltage and to be maintained at the preset voltage when the input voltage of the overvoltage self-locking circuit exceeds a first preset threshold and the output end A1 of the overvoltage self-locking circuit is the preset voltage;
the power supply cut-off circuit is used for controlling the output end of the power supply cut-off circuit to be zero when the input end B1 of the power supply cut-off circuit and the input end B2 of the power supply cut-off circuit are both the preset voltage;
the power supply cut-off circuit comprises a second switch module, a third switch module and a fourth switch module; wherein,
the first end of the second switch module is connected with the second end of the third switch module, the first end of the second switch module is used as the input end B1 of the power supply cut-off circuit, the second end of the second switch module is used as the input end B2 of the power supply cut-off circuit, and the third end of the second switch module is connected with the third end of the third switch module;
the first end of the third switch module is connected with the first end of the fourth switch module, and the first end of the third switch module is connected with an external power supply;
a second end of the fourth switch module is used as an output end of the power supply cut-off circuit, and a third end of the fourth switch module is connected with the external power supply;
the second switch module is used for controlling the third switch module to be turned off when the input end B2 of the power supply cut-off circuit is a preset voltage;
the third switching module is used for controlling the fourth switching module to be switched off when the third switching module is switched off;
and the fourth switching module is used for controlling the output end of the power supply cut-off circuit to be zero when the fourth switching module is switched off.
2. The explosion-proof circuit of claim 1, wherein the over-voltage self-locking circuit comprises a trigger module, a voltage dividing module, a first switch module and a self-locking module; wherein,
the first end of the voltage division module is connected with the trigger module, and the second end of the voltage division module is respectively connected with the first end of the first switch module and the first end of the self-locking module;
the second end of the self-locking module is connected with the second end of the first switch module, and the first output end of the first switch module is used as the output end A1 of the overvoltage self-locking circuit, and the second output end of the first switch module is used as the output end A2 of the overvoltage self-locking circuit;
the voltage division module is used for carrying out voltage division processing on the voltage output by the trigger module;
the first switch module is used for switching on the self-locking module when the voltage output by the voltage division module is greater than a second preset threshold value;
the self-locking module is used for controlling the first switch module to be in a switch-on state when the voltage output by the voltage dividing module is greater than a second preset threshold value.
3. The explosion-proof circuit of claim 1, wherein the power supply cutoff circuit further comprises a protection module, a first end of the protection module is connected with the input terminal B2 of the power supply cutoff circuit, and a second end of the protection module is connected with the second end of the second switch module.
4. The explosion-proof circuit of claim 2 wherein the trigger module comprises an electrolytic capacitor and the voltage divider module comprises a first resistor and a second resistor; wherein,
the anode of the electrolytic capacitor is connected with the first end of the first resistor, and the cathode of the electrolytic capacitor is grounded;
the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded.
5. The explosion-proof circuit of claim 4, wherein the first switch module comprises a regulator, a first capacitor, a second capacitor, a third resistor, a fourth resistor, and a first transistor; wherein,
the first end of the voltage stabilizing regulator is respectively connected with the second end of the first resistor and the first end of the first capacitor, the second end of the voltage stabilizing regulator is connected with the first end of the third resistor, and the third end of the voltage stabilizing regulator is connected with the second end of the first capacitor and grounded;
the first capacitor is connected with the second resistor in parallel;
the first triode is a PNP triode, a base electrode of the first triode is respectively connected with the second end of the third resistor, a collector electrode of the first triode, a first end of the fourth resistor and a first end of the second capacitor, and a connection point is used as a second output end of the first switch module;
and the emitter of the first triode is respectively connected with the second end of the fourth resistor, the second end of the second capacitor and an external power supply, and the connection point is used as the first output end of the first switch module.
6. The explosion-proof circuit of claim 5 wherein the self-locking module comprises a first diode and a fifth resistor; wherein,
the anode of the first diode is connected with the base electrode of the first triode, and the cathode of the first diode is connected with the first end of the fifth resistor;
and the second end of the fifth resistor is connected with the first end of the voltage stabilizing regulator.
7. The explosion-proof circuit of claim 3 wherein the protection module comprises a false-trigger protection device; the second switch module includes: the third capacitor, the sixth resistor, the seventh resistor, the eighth resistor, the second triode and the second diode; wherein,
a first end of the false triggering protection device is used as an input end B2 of the power supply cut-off circuit, and a second end of the false triggering protection device is respectively connected with a first end of the third capacitor, a first end of the sixth resistor and a base electrode of the second triode;
the third capacitor and the sixth resistor are connected in parallel, and a second end of the third capacitor and a second end of the sixth resistor are both grounded;
the second triode is an NPN type triode, an emitting electrode of the second triode is grounded, and a collector electrode of the second triode is connected with the first end of the seventh resistor;
the second end of the seventh resistor is connected with the cathode of the second diode, the anode of the second diode is connected with the first end of the eighth resistor, and the connection point is connected with an external power supply;
a second terminal of the eighth resistor serves as an input terminal B1 of the power supply cutoff circuit.
8. The explosion-proof circuit of claim 7, wherein the third switch module comprises: a ninth resistor, a tenth resistor and a third triode; wherein,
a first end of the ninth resistor is respectively connected with a first end of the seventh resistor and a base electrode of the third triode, and a second end of the ninth resistor is connected with an emitting electrode of the third triode and grounded;
the third triode is an NPN type triode, and a collector of the third triode is connected with the first end of the tenth resistor.
9. The explosion-proof circuit of claim 8, wherein the fourth switch module comprises: the fourth capacitor, the eleventh resistor and the fourth triode; wherein,
the fourth triode is a PNP type triode, the base of the fourth triode is respectively connected with the second end of the tenth resistor, the first end of the fourth capacitor and the first end of the eleventh resistor, the emitting electrode of the fourth triode is respectively connected with the second end of the fourth capacitor and the second end of the eleventh resistor, the connecting point is connected with an external power supply, and the collecting electrode of the fourth triode is used as the output end of the power supply cut-off circuit.
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| CN114136163B (en) * | 2021-09-14 | 2023-05-05 | 上海辰竹仪表有限公司 | Explosion-proof authentication device |
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| JP3306698B2 (en) * | 1996-02-19 | 2002-07-24 | 富士通電装株式会社 | Overvoltage prevention circuit and power supply |
| CN201504096U (en) * | 2009-07-30 | 2010-06-09 | 中兴通讯股份有限公司 | Power supply circuit protection device |
| CN202190055U (en) * | 2011-06-30 | 2012-04-11 | 东莞市盈聚电子有限公司 | Over-voltage protection circuit |
| CN202817694U (en) * | 2012-08-17 | 2013-03-20 | 东莞市慧衍电子有限公司 | Charging protective circuit for USB socket and USB socket |
| CN104218519A (en) * | 2013-05-30 | 2014-12-17 | 海洋王（东莞）照明科技有限公司 | Overvoltage protection circuit and lamp |
| CN104079850B (en) * | 2014-06-23 | 2017-06-13 | 佛山市万宝金品电器有限公司 | A kind of protection circuit of television set |
| CN204992542U (en) * | 2015-09-30 | 2016-01-20 | 合肥华耀电子工业有限公司 | Dead type overvoltage crowbar of lock |
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