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]
The utility model relates to boosting DC/DC converter technology field, particularly a kind of boosting DC/DC transducer with over-voltage protection function.
[background technology]
Step-up DC-DC transducer (Boost DC/DC Converter) is a kind of common, widely used electric power management circuit, it can not only realize transforming to high voltage source from low-voltage source, and it is little to have volume, structure is simple, conversion efficiency advantages of higher.Please refer to shown in Fig. 1, it is a kind of circuit diagram of conventional boosting DC/DC transducer.Boosting DC/DC transducer in Fig. 1 comprises boosting output circuit 110 and feedback control circuit 120.Feedback control circuit 120 controls the first switching device SW1 and second switch device SW2 alternate conduction based on the output voltage VO UT of boosting output circuit 110.First, the first switching device SW1 conducting, second switch device SW2 turns off, and inductive current rises, and electric energy converts magnetic energy form to and is stored in inductance L 1, and the load be connected with output VOUT is discharged to provide energy by electric capacity COUT; Then, the first switching device SW1 turns off, second switch device SW2 conducting, and inductive current declines, and now, powers to together with input power VIN load and electric capacity COUT, thus play boosting by the energy that inductance L 1 stores.
But, existing boosting DC/DC transducer ubiquity problem, likely output voltage VO UT overvoltage can be caused exactly when load generation saltus step, when especially suddenling change from heavy duty to underloading, can overvoltage be there is in output voltage VO UT, feedback control circuit 120 can turn off the first switching device SW1, conducting second switch device SW2, but because the electric current in inductance L 1 can not be undergone mutation, therefore, energy in inductance L 1 still can be transferred to output VOUT, and this can make output voltage VO UT overshoot more serious.In addition, in side circuit, due to loop adjustment is delayed and logical delay etc. reason, thus cause the overshoot condition of output voltage VO UT can be more severe, as processed not in time, very large injury will be caused to subsequent conditioning circuit, time serious, can circuit be burnt.
Therefore, be necessary that the technical scheme proposing a kind of improvement is to overcome the problems referred to above.
[utility model content]
The purpose of this utility model is to provide a kind of boosting DC/DC transducer, and it can prevent output voltage overvoltage, avoids damaging subsequent conditioning circuit.
In order to solve the problem, the utility model provides a kind of boosting DC/DC transducer, and it comprises boosting output circuit, feedback control circuit and overvoltage crowbar.Described boosting output circuit comprises inductance, the first switching device, second switch device and electric capacity, and one end of inductance is connected with input power VIN, and the other end is connected with ground node by the first switching device; Between the connected node that what second switch device and electric capacity were connected successively be connected between inductance and the first switching device and ground node; Connected node between second switch device and electric capacity is as the output VOUT of boosting output circuit.Described feedback control circuit comprises first input end, the first output and the second output, its first input end is connected with described output VOUT, 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.Described overvoltage crowbar comprises the 3rd switching device and over-voltage detection circuit, described 3rd switching device and described inductance in parallel; Described over-voltage detection circuit is for detecting the output voltage whether overvoltage of output VOUT, and its input is connected with output VOUT, and its output is connected with the control end of the 3rd switching device.When the non-overvoltage of output voltage being detected, described over-voltage detection circuit controls the 3rd switching device and turns off; When output voltage overvoltage being detected, described over-voltage detection circuit controls the 3rd switch device conductive.
Further, described feedback control circuit also includes the second input, the output of described over-voltage detection circuit is connected with the second input of described feedback control circuit, when output voltage overvoltage being detected, while described over-voltage detection circuit controls the 3rd switching device shutoff, also order about described feedback control circuit and control the first switching device shutoff, second switch device turns off.
Further, described feedback control circuit is passed through the first control signal of its first output output control first switch device conductive or shutoff based on the output voltage of described output VOUT and is exported the second control signal controlling second switch break-over of device or shutoff by its second output, to control the first switching device and second switch device alternate conduction.
Further, described feedback control circuit is pwm control circuit, and the first control signal that this pwm control circuit exports and the second control signal are pwm control signal.
Further, described over-voltage detection circuit comprises voltage feedback unit and comparator.Described voltage feedback unit is used for the output voltage of sampled output VOUT, and output feedack voltage; An input of described comparator is connected with feedback voltage, its another input is connected with the overvoltage protection threshold pre-set, its output is as the output of described over-voltage detection circuit, described comparator is used for feedback voltage and overvoltage protection threshold to compare, to export corresponding overvoltage protection signal, when feedback voltage is greater than overvoltage protection threshold, the first logic level of described comparator output over-voltage protection signal, it represents output voltage overvoltage boosting output circuit being detected; When feedback voltage is less than overvoltage protection threshold, the second logic level of described comparator output over-voltage protection signal, it represents output voltage not overvoltage boosting output circuit being detected.
Further, described voltage feedback unit comprises and is series at the second resistance between output VOUT and ground node and the first resistance, and wherein, the connected node between the first resistance and the second resistance is as the output of voltage feedback unit.
Further, described first switching device is nmos pass transistor, and described second switch device and the 3rd switching device are PMOS transistor, and the first logic level of described overvoltage protection signal is low level, and the second logic level is high level.
Compared with prior art; boosting DC/DC transducer in the utility model is provided with the overvoltage crowbar be made up of the 3rd switching device and over-voltage detection circuit; when over-voltage detection circuit detects the output voltage overvoltage of boosting DC/DC transducer; by control the 3rd switch device conductive; release to make the energy on the inductance in boosting output circuit; avoid the energy on this inductance to continue to flow to output, solve output voltage overpressure problems, thus avoid damaging subsequent conditioning circuit.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Wherein:
Fig. 1 is a kind of circuit diagram of conventional boosting DC/DC transducer;
Fig. 2 is the circuit diagram of the utility model boosting DC/DC transducer in one embodiment;
Fig. 3 is the circuit diagram of the utility model boosting DC/DC transducer in another embodiment.
[embodiment]
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in further detail the utility model below in conjunction with the drawings and specific embodiments.
Alleged herein " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model.Different local in this manual " in one embodiment " occurred not all refers to same embodiment, neither be independent or optionally mutually exclusive with other embodiments embodiment.Unless stated otherwise, connection herein, be connected, word that the expression that connects is electrically connected all represents and is directly or indirectly electrical connected.
Please refer to shown in Fig. 2, it is the circuit diagram of the utility model boosting DC/DC transducer in one embodiment.Boosting DC/DC transducer in Fig. 2 comprises boosting output circuit 210, feedback control circuit 220 and overvoltage crowbar (sign).
Described boosting output circuit 210 is identical with the circuit structure of the boosting output circuit 110 in Fig. 1.Described boosting output circuit 210 comprises inductance L 1, first switching device SW1, second switch device SW2 and electric capacity COUT.One end of inductance L 1 is connected with input power VIN, and the other end is connected with ground node GND by the first switching device SW1; Between the connected node that what second switch device SW2 and electric capacity COUT connected successively be connected between inductance L 1 and the first switching device SW1 and ground node GND; Connected node between second switch device SW2 and electric capacity COUT is as the output VOUT (it is also the output of boosting DC/DC transducer) of boosting output circuit 210, and this output VOUT can be connected with load.
Described feedback control circuit 220 comprises first input end in1, the second input in2, first output out1 and the second output out2, its first input end in1 is connected with the output VOUT of described boosting output circuit 210, first output out1 is connected with the control end of the first switching device SW1, and the second output out2 is connected with the control end of second switch device SW2.
When described feedback control circuit 220 normally works, described feedback control circuit 220 is passed through the first control signal of its first output out1 output control first switching device SW1 conducting or shutoff based on the output voltage of described output OUT and is exported the second control signal controlling second switch device SW2 conducting or shutoff by its second output out2, to control the first switching device SW1 and second switch device SW2 alternate conduction, thus output voltage VO UT is adjusted to certain set point.The signal that described feedback control circuit 220 also can receive according to the second input in2 makes the first output out1 of described feedback control circuit 220 and the second output out2 export the level signal preset respectively, to control the first switching device SW1 and second switch device SW2 all turns off.
In a preferred embodiment, described feedback control circuit 220 is PWM (Pulse Width Modulation: pulse width modulation) control circuit, and the first control signal that this pwm control circuit exports and the second control signal are pwm control signal.
Described overvoltage crowbar comprises the 3rd switching device SW3 and over-voltage detection circuit 230.Described switching device SW3 is in parallel with described inductance L 1.
The input of described over-voltage detection circuit 230 is connected with the output VOUT of described boosting output circuit 210, and its output is connected with the second input in2 of described feedback control circuit 220 with the control end of the 3rd switching device SW3.Described over-voltage detection circuit 230 is for detecting the output voltage whether overvoltage of output VOUT, when described over-voltage detection circuit 230 detects the non-overvoltage of output voltage, it controls the 3rd switching device SW3 and turns off, normally work to make described feedback control circuit 220, namely described feedback control circuit 220 controls the first switching device SW1 and second switch device SW2 alternate conduction based on output voltage VO UT, thus output voltage VO UT is adjusted to certain set point.When described over-voltage detection circuit 230 detects output voltage overvoltage, it controls the 3rd switching device SW3 conducting, output signal is ordered about described feedback control circuit 220 and is controlled described first switching device SW1 and second switch device SW2 and turn off simultaneously, release in the loop that energy in inductance L 1 is formed through the 3rd switching device SW3, can not continue to flow to output VOUT, make the output voltage of output VOUT can not continue to raise, thus avoid damaging subsequent conditioning circuit.
In the embodiment shown in Figure 2, described over-voltage detection circuit 230 comprises voltage feedback unit 232 and comparator COMP.
Described voltage feedback unit 232 is for the output voltage of sampled output VOUT, and output feedack voltage (also can be described as sampled voltage) VFB.In the embodiment shown in Figure 2, described voltage feedback unit 232 comprises and is series at the second resistance R2 between output VOUT and ground node GND and the first resistance R1, wherein, connected node O between first resistance R1 and the second resistance R2 is as the output of voltage feedback unit 232, and node O is feedback voltage V FB relative to the voltage of ground node GND.Wherein,
VFB is the magnitude of voltage of the feedback voltage that described voltage feedback unit 232 exports, and VOUT is the magnitude of voltage of the output voltage of described boosting output circuit 210, and R1 is the resistance value of the first resistance R1, and R2 is the resistance value of the second resistance R2.
An input of described comparator COMP is connected with feedback voltage V FB, and its another input is connected with the overvoltage protection threshold VREF pre-set, and its output is as the output of described over-voltage detection circuit 230.Described comparator COMP is by comparing feedback voltage V FB and overvoltage protection threshold VREF with output over-voltage protection signal OVP, when feedback voltage V FB is greater than overvoltage protection threshold VREF, first logic level of described comparator COMP output over-voltage protection signal OVP, it represents output voltage overvoltage boosting output circuit 210 being detected, this first logic level controls the 3rd switching device SW3 conducting, orders about described feedback control circuit 220 simultaneously and controls described first switching device SW1 and second switch device SW2 and turn off; When feedback voltage V FB is less than overvoltage protection threshold VREF; second logic level of described comparator COMP output over-voltage protection signal OVP; it represents output voltage not overvoltage boosting output circuit 210 being detected; this second logic level controls the 3rd switching device SW3 and turns off; order about described feedback control circuit 220 normally to work simultaneously; namely described feedback control circuit 220 is based on the output voltage control first switching device SW1 of described output OUT and second switch device SW2 alternate conduction, thus output voltage VO UT is adjusted to certain set point.
In the embodiment shown in Figure 2; described first switching device SW1 is NMOS (N-channel Metal Oxide Semiconductor) transistor; described second switch device SW2 and the 3rd switching device SW3 is PMOS (P-channel Metal Oxide Semiconductor) transistor; first logic level of overvoltage protection signal OVP is low level, and the second logic level is high level.In another embodiment; described first switching device SW1, second switch device SW2 and the 3rd switching device SW3 also can be PMOS transistor or nmos pass transistor; accordingly; need to adjust first logic level of described overvoltage protection signal OVP and level corresponding to the second logic level, to realize and aforementioned corresponding control action.In other embodiments, described first switching device SW1, second switch device SW2 and the 3rd switching device SW3 can be the switching device of other types.
It should be noted that, in another embodiment, also the control of described over-voltage detection circuit 230 to described feedback control circuit 220 can be omitted, as shown in Figure 3, shown in it is another embodiment of described boosting DC/DC transducer, this boosting DC/DC transducer comprises boosting output circuit 310, feedback control circuit 320, 3rd switching device SW3 and over-voltage detection circuit 330, the difference of itself and Fig. 2 is, feedback control circuit 320 can be always in running order, namely described feedback control circuit 320 is based on the output voltage control first switching device SW1 of described output VOUT and second switch device SW2 alternate conduction.The input of over-voltage detection circuit 330 is connected with the output OUT of described boosting output circuit 310, the control end of its output and the 3rd switching device SW3.Described over-voltage detection circuit 330 is for detecting the output voltage whether overvoltage of output VOUT, when described over-voltage detection circuit 330 detects the non-overvoltage of output voltage, it controls the 3rd switching device SW3 and turns off, and now, described feedback control circuit 320 normally works; When described over-voltage detection circuit 330 detects output voltage overvoltage, it controls the 3rd switching device SW3 conducting (now, feedback control circuit 320 is in running order), release in the loop that energy in inductance L 1 is formed through the 3rd switching device SW3, to stop the output voltage of output VOUT to continue to raise as far as possible, thus avoid damaging subsequent conditioning circuit.
In the utility model, " connection ", " being connected ", " company ", " connecing " etc. represent the word be electrically connected, and if no special instructions, then represent direct or indirect electric connection.
It is pointed out that the scope be familiar with person skilled in art and any change that embodiment of the present utility model is done all do not departed to claims of the present utility model.Correspondingly, the scope of claim of the present utility model is also not limited only to previous embodiment.
Claims (7)
1. boost a DC/DC transducer, it is characterized in that, it comprises boosting output circuit, feedback control circuit and overvoltage crowbar,
Described boosting output circuit comprises inductance, the first switching device, second switch device and electric capacity, and one end of inductance is connected with input power VIN, and the other end is connected with ground node by the first switching device; Between the connected node that what second switch device and electric capacity were connected successively be connected between inductance and the first switching device and ground node; Connected node between second switch device and electric capacity as boosting output circuit output VOUT,
Described feedback control circuit comprises first input end, the first output and the second output, its first input end is connected with described output VOUT, 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
Described overvoltage crowbar comprises the 3rd switching device and over-voltage detection circuit, described 3rd switching device and described inductance in parallel; Described over-voltage detection circuit is for detecting the output voltage whether overvoltage of output VOUT, and its input is connected with output VOUT, and its output is connected with the control end of the 3rd switching device,
When the non-overvoltage of output voltage being detected, described over-voltage detection circuit controls the 3rd switching device and turns off; When output voltage overvoltage being detected, described over-voltage detection circuit controls the 3rd switch device conductive.
2. boosting DC/DC transducer according to claim 1, it is characterized in that, described feedback control circuit also includes the second input, and the output of described over-voltage detection circuit is connected with the second input of described feedback control circuit,
When output voltage overvoltage being detected, while described over-voltage detection circuit controls the 3rd switching device shutoff, also order about described feedback control circuit and control the first switching device shutoff, second switch device turns off.
3. boosting DC/DC transducer according to claim 1, it is characterized in that, described feedback control circuit is passed through the first control signal of its first output output control first switch device conductive or shutoff based on the output voltage of described output VOUT and is exported the second control signal controlling second switch break-over of device or shutoff by its second output, to control the first switching device and second switch device alternate conduction.
4., according to the arbitrary described boosting DC/DC transducer of claim 1-3, it is characterized in that,
Described feedback control circuit is pwm control circuit, and the first control signal that this pwm control circuit exports and the second control signal are pwm control signal.
5., according to the arbitrary described boosting DC/DC transducer of claim 1-3, it is characterized in that, described over-voltage detection circuit comprises voltage feedback unit and comparator,
Described voltage feedback unit is used for the output voltage of sampled output VOUT, and output feedack voltage;
An input of described comparator is connected with feedback voltage, its another input is connected with the overvoltage protection threshold pre-set, its output is as the output of described over-voltage detection circuit, described comparator is used for feedback voltage and overvoltage protection threshold to compare, to export corresponding overvoltage protection signal, when feedback voltage is greater than overvoltage protection threshold, first logic level of described comparator output over-voltage protection signal, it represents output voltage overvoltage boosting output circuit being detected; When feedback voltage is less than overvoltage protection threshold, the second logic level of described comparator output over-voltage protection signal, it represents output voltage not overvoltage boosting output circuit being detected.
6. boosting DC/DC transducer according to claim 5, is characterized in that,
Described voltage feedback unit comprises and is series at the second resistance between output VOUT and ground node and the first resistance, and wherein, the connected node between the first resistance and the second resistance is as the output of voltage feedback unit.
7. boosting DC/DC transducer according to claim 5, is characterized in that,
Described first switching device is nmos pass transistor, and described second switch device and the 3rd switching device are PMOS transistor,
First logic level of described overvoltage protection signal is low level, and the second logic level is 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 |
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| 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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| CN204145300U true CN204145300U (en) | 2015-02-04 |
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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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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
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 | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150204 Effective date of abandoning: 20170426 |