CN113206592A - Input protection circuit and auxiliary power supply circuit for IC-OC6800 - Google Patents
Input protection circuit and auxiliary power supply circuit for IC-OC6800 Download PDFInfo
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- CN113206592A CN113206592A CN202110759148.3A CN202110759148A CN113206592A CN 113206592 A CN113206592 A CN 113206592A CN 202110759148 A CN202110759148 A CN 202110759148A CN 113206592 A CN113206592 A CN 113206592A
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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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- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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Abstract
The application discloses an input protection circuit for IC-OC6800, including enabling signal input end, diode D11, inductance L11, resistance R11, TVS diode D12 and enabling output end, enabling signal input end is used for the input of enabling control signal, and enabling output end is used for being connected with pin EN of pin EN. The positive pole of the diode D11 is connected with the enabling signal input end, the negative pole of the diode D11 is connected with the positive pole of the TVS diode D12, the inductor L11 is connected with the resistor R11 in series, one end of the diode D11 is connected with the negative pole of the diode D11 after the diode D11 is connected in series, the other end of the diode D11 after the diode D11 is connected with the enabling output end, and the negative pole of the TVS diode D12 is grounded. The TVS diode is added at the pin EN of the chip IC-OC6800, so that the instantaneous impact voltage can be clamped to a preset voltage value, and the voltage of the input end of the chip IC-OC6800 is not too high to cause chip damage.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to an input protection circuit and an auxiliary power supply circuit for an IC-OC 6800.
Background
The auxiliary power supply is a power supply for the control circuit and the drive circuit. The function is to provide stable low-voltage stabilized power supply for the control circuit and the drive circuit. The requirement is to output 12V and 24V regulated DC power. The auxiliary power supply typically takes the form of a switching power supply to ensure efficiency and reliability. The components of the device are generally formal, flyback, push-pull, full-bridge, half-bridge and the like. The invention uses flyback, the input voltage range of which is 6V to 50V, and the loop feedback is utilized to obtain one output. The flyback switching power supply in the auxiliary power supply refers to a switching power supply which uses a flyback high-frequency transformer to isolate an input-output loop. "flyback" refers to a state where, when the switch tube is turned on, the inductor connected in series in the output line is discharged when the input is at a high level; conversely, when the switching tube is off, the series inductance in the output line is charged when the input is high. In contrast, in the forward switching power supply, when the input is at a high level, the inductor connected in series in the output line is in a charging state, and when the input is at a high level, the inductor connected in series in the output line is in a discharging state, so as to drive the load. Based on that IC-OC6800 flyback auxiliary power supply is a common circuit, IC-OC6800 is a special DC-DC chip specially designed for a boost and buck switching power supply, and a 100V/5A power tube is arranged in the chip. The IC-OC6800 is generally applied to support an input voltage of 5-36V and an output voltage of less than 100V. Because the flyback auxiliary power supply based on the IC-OC6800 is frequently damaged in daily use, a protection circuit is required to be designed for protecting the IC-OC6800 chip.
Disclosure of Invention
The invention mainly solves the technical problem that the IC-OC6800 chip is easy to be damaged in daily use.
According to a first aspect, an embodiment provides an input protection circuit for an IC-OC6800, for voltage-limiting protection of an enable control signal input to a pin EN of the IC-OC 6800;
the input protection circuit comprises an enable signal input end, a diode D11, an inductor L11, a resistor R11, a TVS diode D12 and an enable output end, wherein the enable signal input end is used for inputting the enable control signal, and the enable output end is used for being connected with the pin EN;
the anode of the diode D11 is connected with the enable signal input end, and the cathode of the diode D11 is connected with the anode of the TVS diode D12;
the inductor L11 and the resistor R11 are connected in series, one end of the series connection is connected with the negative electrode of the diode D11, and the other end of the series connection is connected with the enable output end;
the cathode of the TVS diode D12 is grounded.
In one embodiment, the TVS further includes a capacitor C11, one end of which is connected to the anode of the TVS diode D12, and the other end of which is grounded.
In one embodiment, the capacitor C12 is further included, one end of the capacitor C12 is connected to the connection end of the inductor L11 and the resistor R11, and the other end of the capacitor C12 is grounded.
According to a second aspect, an embodiment provides an auxiliary power supply circuit, including the input protection circuit of the first aspect, further including an input protection circuit, an input power supply circuit, a MOS transistor control circuit, an output voltage feedback circuit, an OC6800 chip circuit, a transformer T, and a first voltage output circuit;
the OC6800 chip circuit comprises an IC-OC6800 chip;
the input protection circuit comprises an enabling signal input end, a diode D11, an inductor L11, a resistor R11, a TVS diode D12, an enabling output end and a power circuit connecting end; the enable signal input end is used for inputting an enable control signal of the IC-OC6800 chip, the enable output end is used for being connected with a pin EN of the IC-OC6800 chip, and the power circuit connecting end is used for being connected with the input power circuit; the anode of the diode D11 is connected with the enable signal input end, the cathode of the diode D11 is connected with the anode of the TVS diode D12, and the cathode of the TVS diode D12 is grounded; one end of the inductor L11 is connected with the negative electrode of the diode D11, and the other end of the inductor L11 is connected with the power circuit connection end; one end of the resistor R11 is connected with the power circuit connecting end, and the other end of the resistor R11 is connected with the enable output end;
the input power supply circuit comprises a protective circuit connecting end and a VDD pin connecting end, the protective circuit connecting end is connected with the power supply circuit connecting end, and the VDD pin connecting end is connected with a pin VDD of the IC-OC6800 chip; the input power supply circuit is used for supplying input power to the IC-OC6800 chip;
the MOS tube control circuit comprises a power supply connecting end, an SW pin connecting end, a first transformer connecting end and a second transformer connecting end; the power supply connecting end is connected with the power circuit connecting end, the SW pin connecting end is connected with a pin SW of the IC-OC6800 chip, and the first transformer connecting end and the second transformer connecting end are connected with the transformer T;
the transformer T comprises a first primary coil and a first secondary coil, two ends of the first primary coil are respectively connected with the first transformer connecting end and the second transformer connecting end, and two ends of the first secondary coil are connected with the first voltage output circuit;
the first voltage output circuit comprises a third transformer connection end, a fourth transformer connection end and a voltage output end VCC 1; the third transformer connecting end and the fourth transformer connecting end are respectively connected with two ends of the first secondary coil, and the voltage output end VCC1 is used for outputting an auxiliary power supply voltage;
the output voltage feedback circuit comprises a feedback voltage connecting end and a VFB pin connecting end, the feedback voltage connecting end is electrically connected with the voltage output end VCC1, and the VFB pin is connected with a VFB pin of the IC-OC6800 chip; the output voltage feedback circuit is used for inputting a voltage feedback electric signal to the IC-OC6800 chip.
In one embodiment, the input power circuit further comprises a resistor R21, a resistor R22, and a capacitor C22;
one end of the resistor R21 is connected with the connecting end of the protection circuit, and the other end of the resistor R21 is connected with the connecting end of the VDD pin;
the resistor R22 and the capacitor C22 are connected in parallel, one end of the parallel connection is connected with the VDD pin connection end, and the other end of the parallel connection is grounded.
In one embodiment, the MOS transistor control circuit further includes a diode D51, a resistor R51, and a capacitor C51;
the resistor R51 and the capacitor C51 are connected in parallel, one end of the resistor R51 is connected with the power supply connecting end after being connected in parallel, the other end of the resistor R51 is connected with the negative electrode of the diode D51 after being connected in parallel, and the positive electrode of the diode D51 is connected with the SW pin connecting end; the first transformer connecting end is connected with the power supply connecting end, and the second transformer connecting end is connected with the SW pin connecting end.
In one embodiment, the first voltage output circuit comprises a diode D61, a capacitor C61, and a capacitor C62;
the anode of the diode D61 is connected with the fourth transformer connection end, and the cathode of the diode D61 is connected with the voltage output end VCC 1;
capacitor C61 and capacitor C62 are parallelly connected, the one end after parallelly connected with voltage output VCC1 is connected, the other end after parallelly connected with third transformer link connects, third transformer link ground connection.
In one embodiment, the output voltage feedback circuit comprises a resistor R31, a resistor R32, a resistor R33 and a capacitor C31;
the resistor R31 and the resistor R32 are connected in series, one end of the series connection is connected with the feedback voltage connection end, and the other end of the series connection is connected with the VFB pin connection end;
one end of the resistor R33 is connected with the VFB pin connecting end, and the other end is grounded;
two ends of the capacitor C31 are respectively connected with two ends of the resistor R32;
the OC6800 chip circuit also comprises a resistor R41 and a resistor R42; one end of the resistor R41 is connected with a pin SW of the IC-OC6800 chip, and the other end is grounded; one end of the resistor R42 is connected with a pin VSC of the IC-OC6800 chip, and the other end is grounded.
In one embodiment, the transformer T further includes a second secondary winding;
the auxiliary power supply circuit further comprises a second voltage output circuit, wherein the second voltage output circuit comprises a fifth transformer connecting end, a sixth transformer connecting end and a voltage output end VCC 2; the fifth transformer connecting end and the sixth transformer connecting end are respectively connected with two ends of the second secondary coil, and the voltage output end VCC2 is used for outputting an auxiliary power supply voltage;
the second voltage output circuit further comprises a diode D81, a capacitor C81 and a capacitor C82;
the anode of the diode D81 is connected with the sixth transformer connection end, and the cathode of the diode D81 is connected with the voltage output end VCC 2;
the capacitor C81 is connected with the capacitor C82 in parallel, one end of the capacitor C81 after being connected in parallel is connected with the voltage output end VCC2, the other end of the capacitor C81 after being connected in parallel is connected with the connecting end of the fifth transformer, and the connecting end of the fifth transformer is grounded.
In one embodiment, the transformer T further includes a third secondary winding;
the auxiliary power supply circuit further comprises a third voltage output circuit, and the third voltage output circuit comprises a seventh transformer connecting end, an eighth transformer connecting end and a voltage output end VSS; the seventh transformer connecting end and the eighth transformer connecting end are respectively connected with two ends of the third secondary coil, and the voltage output end VSS is used for outputting an auxiliary power supply voltage;
the third voltage output circuit further comprises a diode D91, a capacitor C91, and a capacitor C92;
the anode of the diode D91 is connected with the seventh transformer connection end, and the cathode of the diode D91 is connected with the voltage output end VSS;
and the capacitor C91 is connected with the capacitor C92 in parallel, one end of the capacitor C91 is connected with the voltage output end VSS after parallel connection, the other end of the capacitor C92 is connected with the eighth transformer connecting end, and the eighth transformer connecting end is grounded.
The input protection circuit according to the above embodiment includes an enable signal input terminal for enabling input of the control signal, a diode D11, an inductor L11, a resistor R11, a TVS diode D12, and an enable output terminal for connecting with a pin EN of the pin EN. The positive pole of the diode D11 is connected with the enabling signal input end, the negative pole of the diode D11 is connected with the positive pole of the TVS diode D12, the inductor L11 is connected with the resistor R11 in series, one end of the diode D11 is connected with the negative pole of the diode D11 after the diode D11 is connected in series, the other end of the diode D11 after the diode D11 is connected with the enabling output end, and the negative pole of the TVS diode D12 is grounded. The TVS diode is added at the pin EN of the chip IC-OC6800, so that the instantaneous impact voltage can be clamped to a preset voltage value, and the voltage of the input end of the chip IC-OC6800 is not too high to cause chip damage.
Drawings
FIG. 1 is a circuit diagram of an input protection circuit according to an embodiment;
FIG. 2 is a circuit diagram of an auxiliary power circuit according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
One reason for analyzing the frequent damage of the IC-OC6800 chip is that the VIN pin of the IC-OC6800 has a high impact voltage at the moment of power-on, so that the IC-OC6800 chip is damaged by overvoltage. A TVS diode is a high performance protection device in the form of a diode. When two poles of the TVS diode are impacted by reverse transient high energy, the TVS diode can change the high impedance between the two poles into low impedance at the speed of 10 to the order of minus 12 seconds, absorb surge power of thousands of watts and clamp the voltage between the two poles at a preset value, thereby effectively protecting precise components in an electronic circuit from being damaged by various surge pulses.
In the embodiment of the application, the input protection circuit for the IC-OC6800 comprises an enabling signal input end, a diode D11, an inductor L11, a resistor R11, a TVS diode D12 and an enabling output end, wherein the enabling signal input end is used for enabling input of a control signal, and the enabling output end is used for being connected with a pin EN of a pin EN. The positive pole of the diode D11 is connected with the enabling signal input end, the negative pole of the diode D11 is connected with the positive pole of the TVS diode D12, the inductor L11 is connected with the resistor R11 in series, one end of the diode D11 is connected with the negative pole of the diode D11 after the diode D11 is connected in series, the other end of the diode D11 after the diode D11 is connected with the enabling output end, and the negative pole of the TVS diode D12 is grounded. The TVS diode is added at the pin EN of the chip IC-OC6800, so that the instantaneous impact voltage can be clamped to a preset voltage value, and the voltage of the input end of the chip IC-OC6800 is not too high to cause chip damage.
The first embodiment is as follows:
referring to fig. 1, a circuit diagram of an input protection circuit in an embodiment is shown, the input protection circuit is used for performing voltage limiting protection on an enable control signal of a pin EN of an input IC-OC 6800. The input protection circuit comprises an enabling signal input end VIN, a diode D11, an inductor L11, a resistor R11, a TVS diode D12 and an enabling output end OUT, wherein the enabling signal input end VIN is used for enabling input of a control signal, and the enabling output end OUT is used for being connected with a pin EN of the IC-OC 6800. The anode of the diode D11 is connected to the enable signal input VIN, and the cathode of the diode D11 is connected to the anode of the TVS diode D12. The inductor L11 and the resistor R11 are connected in series, one end of the series connection is connected with the negative electrode of the diode D11, and the other end of the series connection is connected with the enable output end OUT. The cathode of the TVS diode D12 is grounded. In one embodiment, the input protection circuit further includes a capacitor C11, one end of which is connected to the anode of the TVS diode D12, and the other end of which is grounded. In one embodiment, the input protection circuit further includes a capacitor C12, one end of which is connected to the connection end of the inductor L11 and the resistor R11, and the other end of which is grounded.
Referring to fig. 2, a circuit diagram of an auxiliary power circuit in an embodiment is shown, the auxiliary power circuit includes an input protection circuit 10, an input power circuit 20, a MOS transistor control circuit 50, an output voltage feedback circuit 30, an OC6800 chip circuit 40, a transformer T70, and a first voltage output circuit 60. The OC6800 chip circuit 40 comprises an IC-OC6800 chip. The input protection circuit 10 includes an enable signal input terminal VIN, a diode D11, an inductor L11, a resistor R11, a TVS diode D12, an enable output terminal, and a power circuit connection terminal. The enable signal input end VIN is used for inputting an enable control signal of the IC-OC6800 chip, the enable output end is used for being connected with a pin EN of the IC-OC6800 chip, and the power circuit connecting end is used for being connected with an input power circuit. The anode of the diode D11 is connected to the enable signal input terminal VIN, the cathode of the diode D11 is connected to the anode of the TVS diode D12, and the cathode of the TVS diode D12 is grounded. One end of the inductor L11 is connected to the negative electrode of the diode D11, and the other end is connected to the power circuit connection terminal. One end of the resistor R11 is connected with the power circuit connection end, and the other end is connected with the enable output end. The input power supply circuit 20 includes a protection circuit connection terminal connected to the power supply circuit connection terminal and a VDD pin connection terminal connected to a pin VDD of the IC-OC6800 chip. The input power supply circuit 20 is used to supply input power to the IC-OC6800 chip. The MOS transistor control circuit 50 includes a power connection terminal, a SW pin connection terminal, a first transformer connection terminal, and a second transformer connection terminal. The power supply connecting end is connected with the power supply circuit connecting end, the SW pin connecting end is connected with a pin SW of the IC-OC6800 chip, and the first transformer connecting end and the second transformer connecting end are connected with a transformer T70. The transformer T70 includes a first primary winding and a first secondary winding, both ends of the first primary winding are respectively connected to the first transformer connection terminal and the second transformer connection terminal, and both ends of the first secondary winding are connected to the first voltage output circuit 60. First voltage output circuit 60 includes a third transformer connection terminal, a fourth transformer connection terminal, and a voltage output terminal VCC 1. And the third transformer connecting end and the fourth transformer connecting end are respectively connected with two ends of the first secondary coil, and the voltage output end VCC1 is used for outputting auxiliary power supply voltage. Output voltage feedback circuit 30 includes a feedback voltage connection terminal electrically connected to voltage output terminal VCC1 and a VFB pin connection terminal connected to pin VFB of the IC-OC6800 chip. The output voltage feedback circuit 30 is used to input a voltage feedback electrical signal to the IC-OC6800 chip. In one embodiment, the input power circuit further includes a resistor R21, a resistor R22, and a capacitor C22. One end of the resistor R21 is connected with the connecting end of the protection circuit, and the other end is connected with the connecting end of the VDD pin. The resistor R22 and the capacitor C22 are connected in parallel, one end of the parallel connection is connected with the VDD pin connection end, and the other end of the parallel connection is grounded. In one embodiment, the MOS transistor control circuit 50 further includes a diode D51, a resistor R51, and a capacitor C51. The resistor R51 and the capacitor C51 are connected in parallel, one end of the parallel connection is connected with the power supply connection end, the other end of the parallel connection is connected with the negative electrode of the diode D51, and the positive electrode of the diode D51 is connected with the SW pin connection end. The first transformer connecting end is connected with the power supply connecting end, and the second transformer connecting end is connected with the SW pin connecting end. In one embodiment, the first voltage output circuit 60 includes a diode D61, a capacitor C61, and a capacitor C62. The anode of the diode D61 is connected to the fourth transformer terminal, and the cathode of the diode D61 is connected to the voltage output terminal VCC 1. And the capacitor C61 is connected with the capacitor C62 in parallel, one end of the capacitor C61 is connected with the voltage output end VCC1 after the capacitor C8932 is connected with the voltage output end VCC1 after the capacitor C62 is connected with the voltage output end VCC1 after the capacitor C61 and the capacitor C62 are connected with the voltage output end VCC1 after the capacitor C62 and the voltage output end VCC1 are connected with the voltage output end. In one embodiment, the output voltage feedback circuit 30 includes a resistor R31, a resistor R32, a resistor R33, and a capacitor C33. The resistor R31 and the resistor R32 are connected in series, one end of the series is connected with the feedback voltage connecting end, and the other end of the series is connected with the VFB pin connecting end. One end of the resistor R33 is connected to the VFB pin connection terminal, and the other end is grounded. Both ends of the capacitor C31 are connected to both ends of the resistor R32, respectively. In one embodiment, the OC6800 chip circuit 40 further includes a resistor R41 and a resistor R42. One end of the resistor R41 is connected with a pin SW of the IC-OC6800 chip, and the other end is grounded. One end of the resistor R42 is connected with pin VSC of the IC-OC6800 chip, and the other end is grounded.
In one embodiment, the transformer T70 further includes a second secondary winding. The auxiliary power supply circuit comprises a further second voltage output circuit 80, the second voltage output circuit 80 comprising a fifth transformer connection terminal, a sixth transformer connection terminal and a voltage output terminal VCC 2. And the fifth transformer connecting end and the sixth transformer connecting end are respectively connected with two ends of the second secondary coil, and the voltage output end VCC2 is used for outputting auxiliary power supply voltage. The second voltage output circuit 80 further includes a diode D81, a capacitor C81, and a capacitor C82. The anode of the diode D81 is connected to the sixth transformer connection terminal, and the cathode of the diode D81 is connected to the voltage output terminal VCC 2. And the capacitor C81 is connected with the capacitor C82 in parallel, one end of the capacitor C81 is connected with the voltage output end VCC2 after the capacitor C8932 is connected with the voltage output end VCC2 after the capacitor C82 is connected with the fifth transformer connecting end, and the fifth transformer connecting end is grounded.
In one embodiment, the transformer T70 further includes a third secondary winding. The auxiliary power supply circuit includes a third voltage output circuit 90, and the third voltage output circuit 90 includes a seventh transformer connection terminal, an eighth transformer connection terminal, and a voltage output terminal VSS. And the seventh transformer connecting end and the eighth transformer connecting end are respectively connected with two ends of the third secondary coil, and the voltage output end VSS is used for outputting auxiliary power supply voltage. The third voltage output circuit 90 further includes a diode D91, a capacitor C91, and a capacitor C92. The anode of the diode D91 is connected to the seventh transformer connection, and the cathode of the diode D91 is connected to the voltage output terminal VSS. And the capacitor C91 is connected with the capacitor C92 in parallel, one end of the capacitor C91 is connected with the voltage output end VSS after the capacitor C91 and the capacitor C92 are connected in parallel, the other end of the capacitor C92 is connected with the eighth transformer connecting end, and the eighth transformer connecting end is grounded.
The embodiment of the application discloses an auxiliary power supply circuit, which comprises an input protection circuit, an input power supply circuit, an MOS (metal oxide semiconductor) tube control circuit, an output voltage feedback circuit, an OC6800 chip circuit, a transformer T and a first voltage output circuit. The TVS diode is added at the pin EN of the chip IC-OC6800, so that the instantaneous impact voltage can be clamped to a preset voltage value, and the voltage of the input end of the chip IC-OC6800 is not too high to cause chip damage. An output voltage feedback circuit of the auxiliary power supply circuit is also utilized as a feedback loop to provide a more stable voltage for the output. The flyback transformer winding can provide multiple power supply outputs and is optimized for frequent damage of an IC-OC6800 chip in the early stage. In one embodiment, a voltage VIN (6V-50V) is input, one path of the voltage VIN is connected to a pin VDD of a chip IC-OC6800 through a divider resistor R21, one path of the voltage VIN is stored through a primary winding of a transformer T, and firstly, a loop reference is rectified and output through a secondary winding of the transformer T and a D61; the voltage output terminal VCC1 is further divided by a resistor to obtain a required value (generally 12-15V), and is directly connected to the pin VFB of the chip IC-OC6800 through the voltage dividing resistor R31, the resistor R32 and the resistor R33. The IC-OC6800 controls the on-off of the primary winding of the transformer T after processing through the voltage division, so that the secondary winding can obtain the required voltage of 12-15V. When the chip IC-OC6800 is actually applied, a chip is frequently broken due to faults, and tests show that the circuit has a surge voltage close to 100V at the moment when an enabling signal input end VIN is electrified, so that a TVS diode of 60V is added to the end-to-ground of the enabling signal input end VIN after the chip IC-OC6800 is damaged due to overvoltage (the voltage range of the chip IC-OC6800 is 0-100V), and the transient surge voltage can be clamped to the voltage value, so that the chip IC-OC6800 is prevented from being damaged due to overhigh voltage at the input end.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. An input protection circuit for an IC-OC6800 is characterized in that the input protection circuit is used for carrying out voltage limiting protection on an enable control signal input to a pin EN of the IC-OC 6800;
the input protection circuit comprises an enable signal input end, a diode D11, an inductor L11, a resistor R11, a TVS diode D12 and an enable output end, wherein the enable signal input end is used for inputting an enable control signal of the IC-OC6800, and the enable output end is used for being connected with the pin EN;
the anode of the diode D11 is connected with the enable signal input end, and the cathode of the diode D11 is connected with the anode of the TVS diode D12;
the inductor L11 and the resistor R11 are connected in series, one end of the series connection is connected with the negative electrode of the diode D11, and the other end of the series connection is connected with the enable output end;
the cathode of the TVS diode D12 is grounded.
2. The input protection circuit of claim 1, further comprising a capacitor C11 having one end connected to the anode of the TVS diode D12 and the other end connected to ground.
3. The input protection circuit of claim 1, further comprising a capacitor C12 having one end connected to the connection of the inductor L11 and the resistor R11 and the other end connected to ground.
4. An auxiliary power supply circuit is characterized by comprising an input protection circuit, an input power supply circuit, an MOS (metal oxide semiconductor) tube control circuit, an output voltage feedback circuit, an OC6800 chip circuit, a transformer T and a first voltage output circuit;
the OC6800 chip circuit comprises an IC-OC6800 chip;
the input protection circuit comprises an enabling signal input end, a diode D11, an inductor L11, a resistor R11, a TVS diode D12, an enabling output end and a power circuit connecting end; the enable signal input end is used for inputting an enable control signal of the IC-OC6800 chip, the enable output end is used for being connected with a pin EN of the IC-OC6800 chip, and the power circuit connecting end is used for being connected with the input power circuit; the anode of the diode D11 is connected with the enable signal input end, the cathode of the diode D11 is connected with the anode of the TVS diode D12, and the cathode of the TVS diode D12 is grounded; one end of the inductor L11 is connected with the negative electrode of the diode D11, and the other end of the inductor L11 is connected with the power circuit connection end; one end of the resistor R11 is connected with the power circuit connecting end, and the other end of the resistor R11 is connected with the enable output end;
the input power supply circuit comprises a protective circuit connecting end and a VDD pin connecting end, the protective circuit connecting end is connected with the power supply circuit connecting end, and the VDD pin connecting end is connected with a pin VDD of the IC-OC6800 chip; the input power supply circuit is used for supplying input power to the IC-OC6800 chip;
the MOS tube control circuit comprises a power supply connecting end, an SW pin connecting end, a first transformer connecting end and a second transformer connecting end; the power supply connecting end is connected with the power circuit connecting end, the SW pin connecting end is connected with a pin SW of the IC-OC6800 chip, and the first transformer connecting end and the second transformer connecting end are connected with the transformer T;
the transformer T comprises a first primary coil and a first secondary coil, two ends of the first primary coil are respectively connected with the first transformer connecting end and the second transformer connecting end, and two ends of the first secondary coil are connected with the first voltage output circuit;
the first voltage output circuit comprises a third transformer connection end, a fourth transformer connection end and a voltage output end VCC 1; the third transformer connecting end and the fourth transformer connecting end are respectively connected with two ends of the first secondary coil, and the voltage output end VCC1 is used for outputting an auxiliary power supply voltage;
the output voltage feedback circuit comprises a feedback voltage connecting end and a VFB pin connecting end, the feedback voltage connecting end is electrically connected with the voltage output end VCC1, and the VFB pin is connected with a VFB pin of the IC-OC6800 chip; the output voltage feedback circuit is used for inputting a voltage feedback electric signal to the IC-OC6800 chip.
5. The auxiliary power supply circuit as claimed in claim 4, wherein the input power supply circuit further comprises a resistor R21, a resistor R22, and a capacitor C22;
one end of the resistor R21 is connected with the connecting end of the protection circuit, and the other end of the resistor R21 is connected with the connecting end of the VDD pin;
the resistor R22 and the capacitor C22 are connected in parallel, one end of the parallel connection is connected with the VDD pin connection end, and the other end of the parallel connection is grounded.
6. The auxiliary power supply circuit according to claim 4, wherein the MOS tube control circuit further includes a diode D51 and a resistor R51, a capacitor C51;
the resistor R51 and the capacitor C51 are connected in parallel, one end of the resistor R51 is connected with the power supply connecting end after being connected in parallel, the other end of the resistor R51 is connected with the negative electrode of the diode D51 after being connected in parallel, and the positive electrode of the diode D51 is connected with the SW pin connecting end; the first transformer connecting end is connected with the power supply connecting end, and the second transformer connecting end is connected with the SW pin connecting end.
7. The auxiliary power supply circuit as claimed in claim 4, wherein the first voltage output circuit includes a diode D61, a capacitor C61, and a capacitor C62;
the anode of the diode D61 is connected with the fourth transformer connection end, and the cathode of the diode D61 is connected with the voltage output end VCC 1;
capacitor C61 and capacitor C62 are parallelly connected, the one end after parallelly connected with voltage output VCC1 is connected, the other end after parallelly connected with third transformer link connects, third transformer link ground connection.
8. The auxiliary power supply circuit as claimed in claim 4, wherein the output voltage feedback circuit includes a resistor R31, a resistor R32, a resistor R33, and a capacitor C31;
the resistor R31 and the resistor R32 are connected in series, one end of the series connection is connected with the feedback voltage connection end, and the other end of the series connection is connected with the VFB pin connection end;
one end of the resistor R33 is connected with the VFB pin connecting end, and the other end is grounded;
two ends of the capacitor C31 are respectively connected with two ends of the resistor R32;
the OC6800 chip circuit also comprises a resistor R41 and a resistor R42; one end of the resistor R41 is connected with a pin SW of the IC-OC6800 chip, and the other end is grounded; one end of the resistor R42 is connected with a pin VSC of the IC-OC6800 chip, and the other end is grounded.
9. The auxiliary power supply circuit according to claim 4, wherein said transformer T further comprises a second secondary winding;
the auxiliary power supply circuit further comprises a second voltage output circuit, wherein the second voltage output circuit comprises a fifth transformer connecting end, a sixth transformer connecting end and a voltage output end VCC 2; the fifth transformer connecting end and the sixth transformer connecting end are respectively connected with two ends of the second secondary coil, and the voltage output end VCC2 is used for outputting an auxiliary power supply voltage;
the second voltage output circuit further comprises a diode D81, a capacitor C81 and a capacitor C82;
the anode of the diode D81 is connected with the sixth transformer connection end, and the cathode of the diode D81 is connected with the voltage output end VCC 2;
the capacitor C81 is connected with the capacitor C82 in parallel, one end of the capacitor C81 after being connected in parallel is connected with the voltage output end VCC2, the other end of the capacitor C81 after being connected in parallel is connected with the connecting end of the fifth transformer, and the connecting end of the fifth transformer is grounded.
10. The auxiliary power supply circuit according to claim 4, wherein said transformer T further comprises a third secondary winding;
the auxiliary power supply circuit further comprises a third voltage output circuit, and the third voltage output circuit comprises a seventh transformer connecting end, an eighth transformer connecting end and a voltage output end VSS; the seventh transformer connecting end and the eighth transformer connecting end are respectively connected with two ends of the third secondary coil, and the voltage output end VSS is used for outputting an auxiliary power supply voltage;
the third voltage output circuit further comprises a diode D91, a capacitor C91, and a capacitor C92;
the anode of the diode D91 is connected with the seventh transformer connection end, and the cathode of the diode D91 is connected with the voltage output end VSS;
and the capacitor C91 is connected with the capacitor C92 in parallel, one end of the capacitor C91 is connected with the voltage output end VSS after parallel connection, the other end of the capacitor C92 is connected with the eighth transformer connecting end, and the eighth transformer connecting end is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110759148.3A CN113206592A (en) | 2021-07-06 | 2021-07-06 | Input protection circuit and auxiliary power supply circuit for IC-OC6800 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110759148.3A CN113206592A (en) | 2021-07-06 | 2021-07-06 | Input protection circuit and auxiliary power supply circuit for IC-OC6800 |
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| CN113206592A true CN113206592A (en) | 2021-08-03 |
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| CN202110759148.3A Pending CN113206592A (en) | 2021-07-06 | 2021-07-06 | Input protection circuit and auxiliary power supply circuit for IC-OC6800 |
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Application publication date: 20210803 |