CN211508882U - Bootstrap starting circuit for widening input voltage range - Google Patents
Bootstrap starting circuit for widening input voltage range Download PDFInfo
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- CN211508882U CN211508882U CN201922329883.1U CN201922329883U CN211508882U CN 211508882 U CN211508882 U CN 211508882U CN 201922329883 U CN201922329883 U CN 201922329883U CN 211508882 U CN211508882 U CN 211508882U
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Abstract
The utility model relates to a widen bootstrap starting circuit of input voltage scope, a serial communication port, including the voltage source, self-excited square wave oscillation circuit, bootstrap electric capacity, the isolation diode and the voltage output branch road charge, the voltage source is connected with self-excited square wave oscillation circuit's input and the isolation diode positive pole that charges respectively, and self-excited square wave oscillation circuit's output is connected with bootstrap electric capacity, and self-excited square wave oscillation circuit earthing terminal ground connection, bootstrap electric capacity and the negative pole of the isolation diode that charges all are connected with the voltage output branch road. The utility model provides a bootstrap starting circuit for widening the range of input voltage, which combines a self-excited square wave oscillation circuit to quickly react abnormal voltage signals of a system and output stable square wave signals, and the circuit has accurate reaction and high reaction speed; and the voltage of the bootstrap capacitor is raised through the stable square wave signal, so that the input voltage range of the power utilization circuit is widened, and the normal work of the power utilization circuit during the voltage sag and recovery of the system is ensured.
Description
Technical Field
The utility model relates to an electronic circuit technical field, specific theory relates to a widen bootstrap starting circuit of input voltage range.
Background
In an actual power supply loop, especially in a low-voltage environment, due to abnormal fluctuation of a load and a long line length, a voltage sag can be caused, the time of the voltage sag is short, but the reduction amplitude is large, sometimes, the voltage after the voltage sag is only 10% of the normal voltage, namely, the voltage sag falls to a lower point value, but the power utilization circuit cannot be turned off or reset.
The voltage sag has adverse effects on many automatic control devices, such as misoperation of the devices, and the traditional alternating current stabilized power supply cannot solve the problem of the voltage sag because the reaction time of the traditional alternating current stabilized power supply is not fast enough. In order to better protect the equipment or ensure the stability of the operation process, a circuit capable of automatically and rapidly feeding back according to system abnormality is required, and a wider input voltage range is ensured.
The above problems are worth solving.
Disclosure of Invention
In order to overcome the deficiencies of the prior art, the utility model provides a widen bootstrap starting circuit of input voltage scope.
The utility model discloses technical scheme as follows:
the bootstrap starting circuit capable of widening the input voltage range is characterized by comprising a voltage source, a self-excited square wave oscillation circuit, a bootstrap capacitor, a charging isolation diode and a voltage output branch circuit, wherein the voltage source is respectively connected with the input end of the self-excited square wave oscillation circuit and the anode of the charging isolation diode, the output end of the self-excited square wave oscillation circuit is connected with the bootstrap capacitor, the grounding end of the self-excited square wave oscillation circuit is grounded, and the cathodes of the bootstrap capacitor and the charging isolation diode are connected with the voltage output branch circuit.
The utility model is characterized in that the self-excited square wave oscillation circuit comprises a sawtooth wave circuit and a voltage division circuit;
the sawtooth wave circuit comprises a comparator, a first single-phase diode D22, a first resistor R21, a second resistor R32 and a bypass capacitor C45; the first resistor R21 and the pin 8 of the comparator are both connected to the power supply, the other end of the first resistor R21 is connected to the second resistor R32 and the pin 3 of the first single-phase diode D22, the second resistor R32 and the pin 1 of the first single-phase diode D22 are both connected to the bypass capacitor C45 and the pin 2 of the comparator, the bypass capacitor C45 and the pin 4 of the comparator are both grounded, and the pin 2 of the first single-phase diode D22 is connected to the pin 1 of the comparator;
the voltage division circuit comprises a third resistor R20, a fourth resistor R49 and a fifth resistor R41, the third resistor R20 and the fourth resistor R49 are both connected with the power supply, the other end of the third resistor R20 is connected with a pin 1 of the comparator, the fourth resistor R49 is respectively connected with the fifth resistor R41 and a pin 3 of the comparator, and the other end of the fifth resistor R41 is grounded; and a pin 1 of the comparator is an output end of the self-excited square wave oscillation circuit.
According to the utility model discloses of above-mentioned this scheme, its characterized in that, self-excited square wave oscillation circuit is singlechip or signal generator, singlechip pin 1 connects 5V voltage source, singlechip pin 5 does self-excited square wave oscillation circuit's output.
The present invention according to the above aspect is characterized in that the bootstrap capacitor is a ceramic capacitor or a thin film capacitor or an electrolytic capacitor or a solid capacitor or a polymer capacitor.
According to the utility model discloses of above-mentioned this scheme, its characterized in that, the isolation diode that charges with be equipped with current-limiting resistor between the power.
According to the utility model discloses of above-mentioned this scheme, its characterized in that, be equipped with the single-phase diode of second on the voltage output branch road, the positive pole of the single-phase diode of second is connected with the negative pole and the bootstrap capacitor of the isolation diode that charge respectively, the negative pole of the single-phase diode of second does the output of voltage output branch road.
According to the above scheme the utility model discloses, its beneficial effect lies in:
the circuit is combined with a self-excited square wave oscillating circuit, can quickly respond to an abnormal voltage signal of a system, converts the abnormal voltage signal into a sawtooth wave and outputs a stable square wave signal, and is accurate in response and high in speed; the voltage of the bootstrap capacitor is raised through the stable square wave signal, so that the output voltage range is widened, namely the input voltage range of the rear-stage power utilization circuit is widened, the input voltage range of the rear-stage power utilization circuit is enabled to reach the voltage range required by the circuit, a stable voltage environment is provided, and normal work of the power utilization equipment and the power utilization circuit is protected when the system voltage sag is recovered.
Drawings
Fig. 1 is a circuit module structure diagram of the present invention.
Fig. 2 is a circuit diagram of the first embodiment.
FIG. 3 is a timing diagram of signals at an input terminal and an output terminal of the comparator according to the first embodiment.
Fig. 4 is a circuit diagram of the second embodiment.
Detailed Description
For better understanding of the objects, technical solutions and technical effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be noted that the following examples are only for explaining the present invention and are not intended to limit the present invention.
As shown in fig. 1, a bootstrap starting circuit for widening an input voltage range includes a voltage source, a self-excited square wave oscillation circuit, a bootstrap capacitor, a charging isolation diode and a voltage output branch, the voltage source is respectively connected to an input terminal of the self-excited square wave oscillation circuit and an anode of the charging isolation diode, an output terminal of the self-excited square wave oscillation circuit is connected to the bootstrap capacitor, a ground terminal of the self-excited square wave oscillation circuit is grounded, and cathodes of the bootstrap capacitor and the charging isolation diode are both connected to the voltage output branch.
Example one
As shown in fig. 2, the input terminal of the circuit of the present invention is a 12V voltage source, and the output terminal is the cathode of the second single-phase diode D25.
The 12V voltage source is respectively connected to the input terminal of the self-excited square wave oscillation circuit and the current limiting resistor R54, the other terminal of the current limiting resistor R54 is connected to the anode of the charging isolation diode D28, the cathode of the charging isolation diode D28 is connected to the bootstrap capacitor C114, and charges the bootstrap capacitor C114, where the bootstrap capacitor is a ceramic capacitor in this embodiment, and in other embodiments, the bootstrap capacitor may be a thin-film capacitor or an electrolytic capacitor or a solid capacitor or a polymer capacitor.
The self-excited square wave oscillation circuit comprises a sawtooth wave circuit and a voltage division circuit, the sawtooth wave circuit comprises a comparator U1-A, a first single-phase diode D22, a first resistor R21, a second resistor R32 and a bypass capacitor C45, the voltage division circuit comprises a third resistor R20, a fourth resistor R49 and a fifth resistor R41, and a pin 1 of the comparator U1-A is an output end of the self-excited square wave oscillation circuit and is connected with a bootstrap capacitor C114.
The first resistor R21, the third resistor R20, the fourth resistor R49 and the pin 8 of the comparator are all connected with a power supply.
The other end of the first resistor R21 is respectively connected with a second resistor R32 and a pin 3 of a first single-phase diode D22, the second resistor R32 is connected with a pin 1 of the first single-phase diode D22, the second resistor R32 and the pin 1 are both connected with a bypass capacitor C45 and a pin 2 of a comparator U1-A, and the bypass capacitor C45 and a pin 4 of the comparator U1-A are both grounded; pin 2 of the first single-phase diode D22 is connected to the comparator pin 1.
The other end of the third resistor R20 is connected with pin 1 of the comparator, the other end of the fourth resistor R49 is respectively connected with the fifth resistor R41 and pin 3 of the comparator, and the other end of the fifth resistor R41 is grounded.
As shown in fig. 3, when the system circuit generates a voltage sag and recovers, the sawtooth wave circuit generates a sawtooth wave signal at pin 2 of the comparator U1-a, the voltage divider circuit generates a constant voltage signal at pin 3 of the comparator U1-a, the two signals are compared, and when the sawtooth wave signal voltage is greater than the voltage of the constant voltage signal, pin 1 of the comparator U1-a outputs a low level; when the voltage of the sawtooth wave signal is smaller than that of the constant voltage signal, pin 1 of the comparator U1-A outputs a high level, therefore, the self-excited square wave oscillation circuit automatically feeds back and outputs a square wave according to the fluctuation of the input voltage of the system, the square wave is output to one end of the bootstrap capacitor C114 connected with the bootstrap capacitor C114, the voltage of the bootstrap capacitor C114 is raised because the voltage of the capacitor cannot be suddenly changed, and then the voltage is superposed with the voltage of the output end of the charging isolation diode, so that the voltage range is widened, and finally the voltage V0 is output.
Example two
Compared with the first embodiment, the difference is that the self-excited square wave oscillation circuit is a single chip microcomputer U5, a pin 5 of the single chip microcomputer U5 outputs square waves, and then the voltage is raised through a bootstrap capacitor, so that the purpose of widening the output voltage range is achieved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The bootstrap starting circuit capable of widening the input voltage range is characterized by comprising a voltage source, a self-excited square wave oscillation circuit, a bootstrap capacitor, a charging isolation diode and a voltage output branch circuit, wherein the voltage source is respectively connected with the input end of the self-excited square wave oscillation circuit and the anode of the charging isolation diode, the output end of the self-excited square wave oscillation circuit is connected with the bootstrap capacitor, the grounding end of the self-excited square wave oscillation circuit is grounded, and the cathodes of the bootstrap capacitor and the charging isolation diode are connected with the voltage output branch circuit.
2. The bootstrap startup circuit for broadening the input voltage range as recited in claim 1, wherein said self-excited square wave oscillation circuit comprises a sawtooth wave circuit, a voltage division circuit,
the sawtooth wave circuit comprises a comparator, a first single-phase diode D22, a first resistor R21, a second resistor R32 and a bypass capacitor C45, wherein the first resistor R21 and a pin 8 of the comparator are both connected with the voltage source, the other end of the first resistor R21 is respectively connected with a second resistor R32 and a pin 3 of the first single-phase diode D22, the second resistor R32 is connected with a pin 1 of the first single-phase diode D22 and is connected with the bypass capacitor C45 and a pin 2 of the comparator, the bypass capacitor C45 and a pin 4 of the comparator are both grounded, and a pin 2 of the first single-phase diode D22 is connected with the pin 1 of the comparator,
the voltage division circuit comprises a third resistor R20, a fourth resistor R49 and a fifth resistor R41, the third resistor R20 and the fourth resistor R49 are both connected with the voltage source, the other end of the third resistor R20 is connected with a pin 1 of the comparator, the fourth resistor R49 is respectively connected with the fifth resistor R41 and a pin 3 of the comparator, the other end of the fifth resistor R41 is grounded,
and a pin 1 of the comparator is an output end of the self-excited square wave oscillation circuit.
3. The bootstrap startup circuit for widening the input voltage range according to claim 1, characterized in that said self-excited square wave oscillation circuit is a single chip microcomputer, pin 1 of said single chip microcomputer is connected to a 5V voltage source, and pin 5 of said single chip microcomputer is an output terminal of said self-excited square wave oscillation circuit.
4. The bootstrap startup circuit for broadening the input voltage range as recited in claim 1, wherein said bootstrap capacitor is a ceramic capacitor or a thin film capacitor or an electrolytic capacitor or a solid capacitor or a polymer capacitor.
5. The bootstrap startup circuit for broadening the input voltage range as recited in claim 1, wherein a current limiting resistor is disposed between said charging isolation diode and said voltage source.
6. The bootstrap startup circuit for widening the input voltage range according to claim 1, wherein a second single-phase diode is disposed on the voltage output branch, an anode of the second single-phase diode is respectively connected to a cathode of the charging isolation diode and the bootstrap capacitor, and a cathode of the second single-phase diode is an output terminal of the voltage output branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922329883.1U CN211508882U (en) | 2019-12-23 | 2019-12-23 | Bootstrap starting circuit for widening input voltage range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922329883.1U CN211508882U (en) | 2019-12-23 | 2019-12-23 | Bootstrap starting circuit for widening input voltage range |
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| CN211508882U true CN211508882U (en) | 2020-09-15 |
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| CN201922329883.1U Active CN211508882U (en) | 2019-12-23 | 2019-12-23 | Bootstrap starting circuit for widening input voltage range |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018725A (en) * | 2020-09-22 | 2020-12-01 | 上海创功通讯技术有限公司 | Overvoltage protection device |
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2019
- 2019-12-23 CN CN201922329883.1U patent/CN211508882U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018725A (en) * | 2020-09-22 | 2020-12-01 | 上海创功通讯技术有限公司 | Overvoltage protection device |
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