CN204145300U - A kind of boosting DC/DC transducer - Google Patents
A kind of boosting DC/DC transducer Download PDFInfo
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- CN204145300U CN204145300U CN201420631720.3U CN201420631720U CN204145300U CN 204145300 U CN204145300 U CN 204145300U CN 201420631720 U CN201420631720 U CN 201420631720U CN 204145300 U CN204145300 U CN 204145300U
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Abstract
The utility model provides a kind of boosting DC/DC transducer, and it comprises boosting output circuit, feedback control circuit and overvoltage crowbar.Boosting output circuit comprises inductance, the first switching device, second switch device and electric capacity; Node between second switch device and electric capacity is as the output VOUT of boosting output circuit.The first input end of feedback control circuit is connected with output VOUT, and the first output is connected with the control end of the first switching device, and the second output is connected with the control end of second switch device.Overvoltage crowbar comprises the 3rd switching device and over-voltage detection circuit, the 3rd switching device and inductance in parallel; Over-voltage detection circuit is for detecting the output voltage whether overvoltage of output VOUT, and when the non-overvoltage of output voltage being detected, over-voltage detection circuit controls the 3rd switching device and turns off; When output voltage overvoltage being detected, over-voltage detection circuit controls the 3rd switch device conductive.Compared with prior art, the boosting DC/DC transducer in the utility model can prevent output voltage overvoltage.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a DC/DC converter technical field steps up, in particular to DC/DC converter steps up with overvoltage protection function.
[ background of the invention ]
A Boost DC-DC Converter (Boost DC/DC Converter) is a common power management circuit with wide application, which not only can convert from a low voltage source to a high voltage source, but also has the advantages of small volume, simple structure, high conversion efficiency, etc. Fig. 1 is a circuit diagram of a conventional boost DC/DC converter. The boost DC/DC converter in fig. 1 includes a boost output circuit 110 and a feedback control circuit 120. The feedback control circuit 120 controls the first switching device SW1 and the second switching device SW2 to be alternately turned on based on the output voltage VOUT of the boost output circuit 110. Firstly, the first switching device SW1 is turned on, the second switching device SW2 is turned off, the inductor current rises, the electric energy is converted into a magnetic energy form and stored in the inductor L1, and the load connected with the output terminal VOUT is discharged by the capacitor COUT to provide energy; then, the first switching device SW1 is turned off, the second switching device SW2 is turned on, and the inductor current decreases, and at this time, the load and the capacitor COUT are powered by the energy stored in the inductor L1 together with the input power source VIN, thereby performing a boosting function.
However, the conventional boost DC/DC converter generally has a problem that the output voltage VOUT may be over-voltage when the load jumps, and particularly, when the load jumps from a heavy load to a light load, the output voltage VOUT will be over-voltage, and the feedback control circuit 120 will turn off the first switching device SW1 and turn on the second switching device SW2, but since the current in the inductor L1 cannot jump suddenly, the energy in the inductor L1 will still be transmitted to the output terminal VOUT, which will cause the output voltage VOUT to overshoot more seriously. In addition, in an actual circuit, due to reasons such as loop regulation lag and logic delay, the overshoot condition of the output voltage VOUT is worse, if the overshoot condition is not processed in time, a subsequent circuit is greatly damaged, and the circuit is burned down in a serious condition.
Therefore, there is a need for an improved solution to overcome the above problems.
[ Utility model ] content
An object of the utility model is to provide a DC/DC converter steps up, it can prevent output voltage excessive pressure, avoids damaging follow-up circuit.
In order to solve the above problem, the utility model provides a DC/DC converter steps up, it includes output circuit, feedback control circuit and the overvoltage crowbar that steps up. The boost output circuit comprises an inductor, a first switching device, a second switching device and a capacitor, wherein one end of the inductor is connected with an input power supply VIN, and the other end of the inductor is connected with a ground node through the first switching device; the second switching device and the capacitor are sequentially connected in series between a connection node between the inductor and the first switching device and a ground node; and a connection node between the second switching device and the capacitor is used as an output end VOUT of the boost output circuit. The feedback control circuit comprises a first input end, a first output end and a second output end, wherein the first input end is connected with the output end VOUT, the first output end is connected with the control end of the first switching device, and the second output end is connected with the control end of the second switching device. The overvoltage protection circuit comprises a third switching device and an overvoltage detection circuit, and the third switching device is connected with the inductor in parallel; the overvoltage detection circuit is used for detecting whether the output voltage of the output end VOUT is overvoltage or not, the input end of the overvoltage detection circuit is connected with the output end VOUT, and the output end of the overvoltage detection circuit is connected with the control end of the third switching device. When the output voltage is detected to be not overvoltage, the overvoltage detection circuit controls the third switching device to be turned off; when the overvoltage of the output voltage is detected, the overvoltage detection circuit controls the third switching device to be conducted.
Furthermore, the feedback control circuit further comprises a second input end, the output end of the overvoltage detection circuit is connected with the second input end of the feedback control circuit, and when the overvoltage detection circuit detects that the output voltage is overvoltage, the overvoltage detection circuit controls the third switching device to be turned off and simultaneously drives the feedback control circuit to control the first switching device to be turned off and the second switching device to be turned off.
Further, the feedback control circuit outputs a first control signal for controlling the first switching device to be turned on or off through a first output terminal thereof and outputs a second control signal for controlling the second switching device to be turned on or off through a second output terminal thereof based on the output voltage of the output terminal VOUT to control the first switching device and the second switching device to be alternately turned on.
Further, the feedback control circuit is a PWM control circuit, and the first control signal and the second control signal output by the PWM control circuit are both PWM control signals.
Further, the overvoltage detection circuit comprises a voltage feedback unit and a comparator. The voltage feedback unit is used for sampling the output voltage of the output end VOUT and outputting a feedback voltage; one input end of the comparator is connected with the feedback voltage, the other input end of the comparator is connected with a preset overvoltage protection threshold, the output end of the comparator is used as the output end of the overvoltage detection circuit, the comparator is used for comparing the feedback voltage with the overvoltage protection threshold to output a corresponding overvoltage protection signal, and when the feedback voltage is greater than the overvoltage protection threshold, the comparator outputs a first logic level of the overvoltage protection signal, which indicates that the output voltage of the boosting output circuit is detected to be overvoltage; when the feedback voltage is less than the over-voltage protection threshold, the comparator outputs a second logic level of the over-voltage protection signal, which indicates that the output voltage of the boost output circuit is detected to be over-voltage.
Further, the voltage feedback unit includes a second resistor and a first resistor connected in series between the output terminal VOUT and a ground node, wherein a connection node between the first resistor and the second resistor serves as an output terminal of the voltage feedback unit.
Further, the first switch device is an NMOS transistor, the second switch device and the third switch device are PMOS transistors, the first logic level of the overvoltage protection signal is a low level, and the second logic level is a high level.
Compared with the prior art, the utility model provides a DC/DC converter steps up is provided with the overvoltage crowbar circuit who comprises third switch device and excessive pressure detection circuitry, when excessive pressure detection circuitry detected the output voltage excessive pressure of DC/DC converter steps up, will control the third switch device and switch on to make the energy on the inductance in the output circuit that steps up discharge, avoid the energy on this inductance to continue to flow to the output, solve output voltage excessive pressure problem, thereby avoid damaging follow-up circuit.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 is a schematic circuit diagram of a conventional boost DC/DC converter;
fig. 2 is a schematic circuit diagram of a boost DC/DC converter in an embodiment of the present invention;
fig. 3 is a circuit diagram of a boost DC/DC converter according to another embodiment of the present invention.
[ detailed description ] embodiments
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.
Please refer to fig. 2, which is a schematic circuit diagram of a boost DC/DC converter according to an embodiment of the present invention. The boost DC/DC converter in fig. 2 includes a boost output circuit 210, a feedback control circuit 220, and an overvoltage protection circuit (not labeled).
The boost output circuit 210 has the same circuit structure as the boost output circuit 110 in fig. 1. The boost output circuit 210 includes an inductor L1, a first switching device SW1, a second switching device SW2, and a capacitor COUT. One end of the inductor L1 is connected to the input power VIN, and the other end is connected to the ground node GND through the first switching device SW 1; the second switching device SW2 and the capacitor COUT are connected in series in sequence between the ground node GND and a connection node between the inductor L1 and the first switching device SW 1; the connection node between the second switching device SW2 and the capacitor COUT serves as an output terminal VOUT of the boost output circuit 210 (which is also an output terminal of the boost DC/DC converter), which may be connected to a load.
The feedback control circuit 220 includes a first input terminal in1, a second input terminal in2, a first output terminal out1 and a second output terminal out2, wherein the first input terminal in1 is connected to the output terminal VOUT of the boost output circuit 210, the first output terminal out1 is connected to a control terminal of the first switching device SW1, and the second output terminal out2 is connected to a control terminal of the second switching device SW 2.
When the feedback control circuit 220 normally operates, the feedback control circuit 220 outputs a first control signal for controlling the first switching device SW1 to be turned on or off through the first output terminal OUT1 thereof and a second control signal for controlling the second switching device SW2 to be turned on or off through the second output terminal OUT2 thereof based on the output voltage of the output terminal OUT, so as to control the first switching device SW1 and the second switching device SW2 to be alternately turned on, thereby adjusting the output voltage VOUT to a certain set value. The feedback control circuit 220 may also enable the first output end out1 and the second output end out2 of the feedback control circuit 220 to output predetermined level signals respectively according to the signal received by the second input end in2, so as to control both the first switching device SW1 and the second switching device SW2 to turn off.
In a preferred embodiment, the feedback control circuit 220 is a PWM (Pulse Width Modulation) control circuit, and the first control signal and the second control signal output by the PWM control circuit are both PWM control signals.
The overvoltage protection circuit includes a third switching device SW3 and an overvoltage detection circuit 230. The switching device SW3 is connected in parallel with the inductor L1.
The input terminal of the over-voltage detection circuit 230 is connected to the output terminal VOUT of the boost output circuit 210, and the output terminal thereof is connected to the control terminal of the third switching device SW3 and the second input terminal in2 of the feedback control circuit 220. The over-voltage detection circuit 230 is used for detecting whether the output voltage of the output terminal VOUT is over-voltage, and when the over-voltage detection circuit 230 detects that the output voltage is not over-voltage, it controls the third switching device SW3 to turn off, so that the feedback control circuit 220 operates normally, that is, the feedback control circuit 220 controls the first switching device SW1 and the second switching device SW2 to turn on alternately based on the output voltage VOUT, thereby adjusting the output voltage VOUT to a certain set value. When the overvoltage detection circuit 230 detects that the output voltage is overvoltage, it controls the third switching device SW3 to turn on, and at the same time, the output signal drives the feedback control circuit 220 to control the first switching device SW1 and the second switching device SW2 to turn off, so that the energy in the inductor L1 is discharged through the loop formed by the third switching device SW3, and does not continue to flow to the output terminal VOUT, and the output voltage at the output terminal VOUT does not continue to rise, thereby avoiding damaging subsequent circuits.
In the embodiment shown in fig. 2, the overvoltage detection circuit 230 includes a voltage feedback unit 232 and a comparator COMP.
The voltage feedback unit 232 is configured to sample an output voltage of the output terminal VOUT and output a feedback voltage (also referred to as a sampled voltage) VFB. In the embodiment shown in fig. 2, the voltage feedback unit 232 includes a second resistor R2 and a first resistor R1 connected in series between the output terminal VOUT and the ground node GND, wherein a connection node O between the first resistor R1 and the second resistor R2 is used as the output terminal of the voltage feedback unit 232, and the voltage of the node O relative to the ground node GND is the feedback voltage VFB. Wherein,
VFB is a voltage value of the feedback voltage output by the voltage feedback unit 232, VOUT is a voltage value of the output voltage of the boost output circuit 210, R1 is a resistance value of the first resistor R1, and R2 is a resistance value of the second resistor R2.
One input end of the comparator COMP is connected to the feedback voltage VFB, the other input end thereof is connected to a preset overvoltage protection threshold VREF, and the output end thereof is used as the output end of the overvoltage detection circuit 230. The comparator COMP outputs an overvoltage protection signal OVP by comparing the feedback voltage VFB with the overvoltage protection threshold VREF, and when the feedback voltage VFB is greater than the overvoltage protection threshold VREF, the comparator COMP outputs a first logic level of the overvoltage protection signal OVP, which indicates that the output voltage of the boost output circuit 210 is detected to be overvoltage, and the first logic level controls the third switching device SW3 to be turned on, and simultaneously drives the feedback control circuit 220 to control the first switching device SW1 and the second switching device SW2 to be turned off; when the feedback voltage VFB is smaller than the over-voltage protection threshold VREF, the comparator COMP outputs a second logic level of the over-voltage protection signal OVP, which indicates that the output voltage of the boost output circuit 210 is detected to be not over-voltage, and the second logic level controls the third switching device SW3 to turn off, and at the same time drives the feedback control circuit 220 to operate normally, that is, the feedback control circuit 220 controls the first switching device SW1 and the second switching device SW2 to turn on alternately based on the output voltage of the output terminal OUT, so as to adjust the output voltage VOUT to a certain set value.
In the embodiment shown in fig. 2, the first switching device SW1 is an NMOS (N-channel Metal Oxide Semiconductor) transistor, the second switching device SW2 and the third switching device SW3 are both PMOS (P-channel Metal Oxide Semiconductor) transistors, the first logic level of the overvoltage protection signal OVP is low, and the second logic level is high. In another embodiment, the first switching device SW1, the second switching device SW2 and the third switching device SW3 may also be all PMOS transistors or NMOS transistors, and accordingly, the levels corresponding to the first logic level and the second logic level of the overvoltage protection signal OVP need to be adjusted to achieve the corresponding control actions. In other embodiments, the first, second and third switching devices SW1, SW2 and SW3 may be other types of switching devices.
It should be noted that, in another embodiment, the control of the feedback control circuit 220 by the overvoltage detection circuit 230 may also be omitted, as shown in fig. 3, which shows another embodiment of the boost DC/DC converter, the boost DC/DC converter includes a boost output circuit 310, a feedback control circuit 320, a third switching device SW3 and an overvoltage detection circuit 330, and the difference from fig. 2 is that the feedback control circuit 320 may be in an operating state at all times, that is, the feedback control circuit 320 controls the first switching device SW1 and the second switching device SW2 to be alternately turned on based on the output voltage of the output terminal VOUT. The input terminal of the over-voltage detection circuit 330 is connected to the output terminal OUT of the boost output circuit 310, and the output terminal thereof is connected to the control terminal of the third switching device SW 3. The overvoltage detection circuit 330 is configured to detect whether the output voltage of the output terminal VOUT is overvoltage, and when the overvoltage detection circuit 330 detects that the output voltage is not overvoltage, the overvoltage detection circuit controls the third switching device SW3 to turn off, and at this time, the feedback control circuit 320 operates normally; when the overvoltage detection circuit 330 detects an overvoltage of the output voltage, it controls the third switching device SW3 to turn on (at this time, the feedback control circuit 320 is in an operating state), and the energy in the inductor L1 is discharged through the loop formed by the third switching device SW3, so as to prevent the output voltage at the output terminal VOUT from rising further as much as possible, thereby avoiding damage to subsequent circuits.
In the present invention, the terms "connected", "connecting", and the like denote electrical connections, and, unless otherwise specified, may denote direct or indirect electrical connections.
It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not to be limited to the specific embodiments described above.
Claims (7)
1. A step-up DC/DC converter is characterized in that it comprises a step-up output circuit, a feedback control circuit and an overvoltage protection circuit,
the boost output circuit comprises an inductor, a first switching device, a second switching device and a capacitor, wherein one end of the inductor is connected with an input power supply VIN, and the other end of the inductor is connected with a ground node through the first switching device; the second switching device and the capacitor are sequentially connected in series between a connection node between the inductor and the first switching device and a ground node; the connection node between the second switching device and the capacitor serves as an output terminal VOUT of the boost output circuit,
the feedback control circuit comprises a first input end, a first output end and a second output end, wherein the first input end is connected with the output end VOUT, the first output end is connected with the control end of the first switching device, the second output end is connected with the control end of the second switching device,
the overvoltage protection circuit comprises a third switching device and an overvoltage detection circuit, and the third switching device is connected with the inductor in parallel; the overvoltage detection circuit is used for detecting whether the output voltage of the output end VOUT is overvoltage or not, the input end of the overvoltage detection circuit is connected with the output end VOUT, the output end of the overvoltage detection circuit is connected with the control end of the third switching device,
when the output voltage is detected to be not overvoltage, the overvoltage detection circuit controls the third switching device to be turned off; when the overvoltage of the output voltage is detected, the overvoltage detection circuit controls the third switching device to be conducted.
2. A step-up DC/DC converter as claimed in claim 1, characterized in that the feedback control circuit further comprises a second input terminal, the output terminal of the overvoltage detection circuit is connected to the second input terminal of the feedback control circuit,
when the overvoltage detection circuit detects that the output voltage is overvoltage, the overvoltage detection circuit controls the third switching device to be turned off, and meanwhile drives the feedback control circuit to control the first switching device to be turned off and the second switching device to be turned off.
3. The boost DC/DC converter according to claim 1, wherein the feedback control circuit outputs a first control signal for controlling the first switching device to be turned on or off through a first output terminal thereof and a second control signal for controlling the second switching device to be turned on or off through a second output terminal thereof based on the output voltage of the output terminal VOUT to control the first switching device and the second switching device to be alternately turned on.
4. A step-up DC/DC converter according to any of claims 1 to 3,
the feedback control circuit is a PWM control circuit, and the first control signal and the second control signal output by the PWM control circuit are both PWM control signals.
5. A step-up DC/DC converter according to any of claims 1 to 3, characterized in that the overvoltage detection circuit comprises a voltage feedback unit and a comparator,
the voltage feedback unit is used for sampling the output voltage of the output end VOUT and outputting a feedback voltage;
one input end of the comparator is connected with the feedback voltage, the other input end of the comparator is connected with a preset overvoltage protection threshold, the output end of the comparator is used as the output end of the overvoltage detection circuit, the comparator is used for comparing the feedback voltage with the overvoltage protection threshold to output a corresponding overvoltage protection signal, and when the feedback voltage is greater than the overvoltage protection threshold, the comparator outputs a first logic level of the overvoltage protection signal, which indicates that the output voltage of the boosting output circuit is detected to be overvoltage; when the feedback voltage is less than the over-voltage protection threshold, the comparator outputs a second logic level of the over-voltage protection signal, which indicates that the output voltage of the boost output circuit is detected to be over-voltage.
6. A step-up DC/DC converter according to claim 5,
the voltage feedback unit comprises a second resistor and a first resistor which are connected between the output terminal VOUT and a ground node in series, wherein a connection node between the first resistor and the second resistor serves as the output terminal of the voltage feedback unit.
7. A step-up DC/DC converter according to claim 5,
the first switching device is an NMOS transistor, the second switching device and the third switching device are PMOS transistors,
the first logic level of the overvoltage protection signal is a low level, and the second logic level of the overvoltage protection signal is a high level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420631720.3U CN204145300U (en) | 2014-10-28 | 2014-10-28 | A kind of boosting DC/DC transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420631720.3U CN204145300U (en) | 2014-10-28 | 2014-10-28 | A kind of boosting DC/DC transducer |
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| Publication Number | Publication Date |
|---|---|
| CN204145300U true CN204145300U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420631720.3U Withdrawn - After Issue CN204145300U (en) | 2014-10-28 | 2014-10-28 | A kind of boosting DC/DC transducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333225B (en) * | 2014-10-28 | 2017-04-26 | 无锡中感微电子股份有限公司 | Step-up DC/DC converter |
-
2014
- 2014-10-28 CN CN201420631720.3U patent/CN204145300U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333225B (en) * | 2014-10-28 | 2017-04-26 | 无锡中感微电子股份有限公司 | Step-up DC/DC converter |
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Address after: 214028 Jiangsu science and Technology Park, Taihu science and Technology Park, No. 18, Wuxi Road, science and Technology Park, No. 530, A1001 Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: Wuxi Vimicro Corporation |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20150204 Effective date of abandoning: 20170426 |