CN108880255A - Booster circuit - Google Patents
Booster circuit Download PDFInfo
- Publication number
- CN108880255A CN108880255A CN201811002914.6A CN201811002914A CN108880255A CN 108880255 A CN108880255 A CN 108880255A CN 201811002914 A CN201811002914 A CN 201811002914A CN 108880255 A CN108880255 A CN 108880255A
- Authority
- CN
- China
- Prior art keywords
- booster circuit
- working frequency
- switch
- monitoring unit
- operating frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 239000003985 ceramic capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of booster circuits, including：One end ground connection, the other end connect the load resistance of the output end of the booster circuit by switch；Input terminal accesses the control unit of the booster circuit, output end connect the switch control terminal working frequency monitoring unit, the working frequency monitoring unit is switched on-off for monitoring working frequency of the booster circuit under pulse frequency modulated mode, and according to described in the control of the working frequency of the booster circuit.Wherein, load resistance is connected to the output end of booster circuit by switch, on-off of the working frequency monitoring unit according to the working frequency control switch of booster circuit, and then it realizes and is added or removes load resistance in the output end of booster circuit, realize the adjustment to the working frequency of booster circuit, guarantee that the working frequency of booster circuit is not located to generate in the operating frequency range uttered long and high-pitched sounds of capacitor, avoids booster circuit from capacitor occur and utter long and high-pitched sounds problem.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a booster circuit.
Background
With the rise of portable electronic products, the volume of electronic components is required to be smaller and smaller. The surface-mounted ceramic capacitor has the advantages of small volume and large capacitance value, and is widely applied. At present, a boost circuit with a Pulse Frequency Modulation (PFM) control mode adopts a chip ceramic capacitor as an output capacitor.
Specifically, the chip ceramic capacitor is welded on a circuit board in the booster circuit, and the circuit board vibrates along with the expansion and contraction of the capacitor in the actual operation process of the booster circuit. In some cases, the boost circuit may also experience a capacitor howling phenomenon.
Disclosure of Invention
Based on the above deficiencies of the prior art, the present invention provides a boost circuit to solve the capacitor howling problem.
To solve the above problems, the following solutions are proposed:
a boost circuit, comprising:
the load resistor is grounded at one end, and the other end of the load resistor is connected with the output end of the booster circuit through a switch;
the input end of the control unit is connected with the booster circuit, and the output end of the working frequency monitoring unit is connected with the control end of the switch.
Optionally, the operating frequency monitoring unit monitors an operating frequency of the voltage boost circuit in a pulse frequency modulation mode, and controls on/off of the switch according to the operating frequency of the voltage boost circuit, and is configured to:
judging that the working frequency of the booster circuit is lower than a first preset threshold value, and controlling the switch to be conducted; judging that the working frequency of the booster circuit is higher than a second preset threshold value, and controlling the switch to be switched off; the second preset threshold is greater than a first preset threshold, and the first preset threshold is set according to the frequency of the booster circuit under the capacitance howling phenomenon.
Optionally, the first preset threshold comprises 20 KHz.
Optionally, the determining, by the operating frequency monitoring unit, whether the operating frequency of the voltage boost circuit is lower than a first preset threshold includes:
the working frequency monitoring unit judges whether the duration time of a preset signal output by the control unit of the booster circuit reaches a preset time or not;
the working frequency monitoring unit judges that the duration time of a preset signal output by the control unit of the booster circuit reaches preset time, and then judges that the working frequency of the booster circuit is lower than a first preset threshold value.
Optionally, the operating frequency monitoring unit includes: and the counter is used for judging whether the duration time of the preset signal output by the control unit of the booster circuit reaches a preset time or not.
Optionally, the counter comprises: a plurality of interconnected D flip-flops; wherein,
a clock input port of the head D trigger is used as an input port of the counter and used for receiving a clock signal; a first output port of the last D flip-flop is used as an output port of the counter; the clock input port of the next D trigger is connected with the second output port of the previous D trigger;
the reset port of each D trigger is input with a preset signal output by the control unit of the booster circuit.
Optionally, the calculation formula of the resistance value of the load resistor is as follows: r ═ CoutX Δ V × F; wherein, CoutThe output capacitor is connected with the booster circuit, and delta V is an output voltage ripple of the booster circuit in a pulse frequency modulation mode; f is the lowest working frequency of the booster circuit.
Optionally, the operating frequency monitoring unit, the switch and the load resistor are integrally disposed on a circuit board of the voltage boost circuit.
In the booster circuit provided by the invention, the load resistor is connected to the output end of the booster circuit through the switch, and the working frequency monitoring unit controls the on-off of the switch according to the working frequency of the booster circuit, so that the load resistor is added or removed from the output end of the booster circuit, the working frequency of the booster circuit is adjusted, the working frequency of the booster circuit is ensured not to be within the working frequency range generating the capacitor squeal, and the problem of the capacitor squeal of the booster circuit is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a voltage boost circuit according to an embodiment of the disclosure;
FIG. 2 is a diagram showing a Stop _ switch signal generated by the control unit according to the disclosure of the present invention;
fig. 3 is a schematic structural diagram of a counter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the capacitance howling phenomenon is more easily generated in the boosting type product with the PFM control mode. Firstly, the boosting product has a PFM control mode, and in the control mode, the working frequency of the boosting product enters the range of 20Hz to 20kHz along with the reduction of the load; secondly, the natural output ripple of the boost product is relatively large.
From the above analysis it follows that: the capacitor must satisfy two conditions simultaneously to generate howling: the ripple amplitude at two ends of the capacitor is large, and the ripple frequency at two ends of the capacitor is within the range of 20Hz-20 Khz. The capacitor howling problem is solved naturally as long as any one of the two is destroyed.
Based on this, the present application provides a boost circuit to solve the problem of capacitor howling.
The boost circuit disclosed in the embodiment of the present application, as shown in fig. 1, includes:
and the output terminal V of the booster circuit 101OUTAnd a connected switch K.
And one end of the load resistor R is grounded, and the other end of the load resistor R is connected with the switch K.
The input end is connected to the control unit 111 of the boost circuit 101, and the output end is connected to the working frequency monitoring unit 112 of the control end of the switch K, and the working frequency monitoring unit 112 is used for monitoring the working frequency of the boost circuit 101 in the pulse frequency modulation mode and controlling the on-off of the switch K according to the working frequency of the boost circuit 101.
Alternatively, during the actual generation of the voltage boost circuit, the operating frequency monitoring unit 112, the switch K and the load resistor R may be integrated on a circuit board of the voltage boost circuit 101, and the circuit board may be understood as a main chip of the voltage boost circuit, that is, the operating frequency monitoring unit 112, the switch K and the load resistor R are integrated inside the chip of the voltage boost circuit.
Alternatively, the load resistance R provided in the booster circuit may be calculated by the following calculation formula.
The calculation formula is as follows: r ═ CoutX Δ V × F; wherein, CoutThe output capacitor is connected with the booster circuit, and the delta V is an output voltage ripple of the booster circuit in a pulse frequency modulation mode; and F is the lowest working frequency of the booster circuit, and specifically corresponds to the working frequency of the booster circuit under the capacitor howling.
Wherein, the load resistor R is connected to the output end V of the voltage boost circuit 101 through the switch KOUTThe operating frequency monitoring unit 112 controls the switch K to be turned off according to the operating frequency of the voltage boost circuit 101, so as to add or remove the load resistor R at the output end of the voltage boost circuit 101, thereby adjusting the operating frequency of the voltage boost circuit 101, ensuring that the operating frequency of the voltage boost circuit 101 is not within the operating frequency range where the capacitor howling is generated, and avoiding the capacitor howling problem of the voltage boost circuit.
Optionally, the operation frequency monitoring unit 112 controls on/off of the switch K according to the operation frequency of the voltage boost circuit, including:
judging that the working frequency of the booster circuit 101 is lower than a first preset threshold value, and controlling the switch K to be conducted; and judging that the working frequency of the booster circuit 101 is higher than a second preset threshold value, and controlling the switch K to be switched off.
The second preset threshold is greater than a first preset threshold, and the first preset threshold is set according to the frequency of the boost circuit 101 under the capacitance howling phenomenon.
Specifically, the first preset threshold is set according to the frequency of the boost circuit 101 under the capacitor howling phenomenon, as can be seen from the above: the operating frequency of the boost circuit 101 in the pulse frequency modulation mode is in the range of 20Hz to 20Khz, which is a condition for generating the capacitor howling. Also, when the load of the output terminal of the voltage boosting circuit 101 decreases, the operating frequency of the voltage boosting circuit 101 also decreases gradually. Thus, the operating frequency of the boost circuit 101 is reduced to the operating frequency under the capacitor howling phenomenon, which is generally about 20Khz, at this time, the operating frequency monitoring unit 112 controls the switch K to be turned on, the load resistor R is added to the load at the output end of the boost circuit 101, so that the load at the output end of the boost circuit 101 is increased, and the operating frequency of the boost circuit 101 is increased and is far away from the first preset threshold.
When the operating frequency of the voltage boost circuit 101 is higher than a second preset threshold, for example: 60Khz, in order to reduce the output load of the voltage boost circuit 101, the operating frequency monitoring unit 112 controls the switch K to be turned off, so that the load resistor R exits from the output terminal of the voltage boost circuit 101.
It should be further noted that, one way for the operating frequency monitoring unit 112 to determine whether the operating frequency of the voltage boost circuit 101 is lower than the first preset threshold includes:
the operating frequency monitoring unit 112 determines whether the duration of the predetermined signal output by the control unit 111 of the booster circuit 101 reaches a predetermined time.
The operating frequency monitoring unit 112 determines that the duration of the predetermined signal output by the control unit 111 of the voltage boost circuit 101 reaches a predetermined time, and then determines that the operating frequency of the voltage boost circuit 101 is lower than a first preset threshold.
The booster circuit 101 operates in the PFM control mode, and the control unit 111 monitors the output voltage of the booster circuit 101. As shown in fig. 2, when the output voltage monitored by the control unit 111 is higher than the target voltage by Δ V, the control unit 111 sends a stop _ switch signal to control other units in the voltage boost circuit 101 to enter a power saving state.
Specifically, the duration of the high level of the Stop _ switch signal is related to the load resistance at the output of the voltage boost circuit 101, and the lighter the load resistance, the longer the duration. Therefore, the operating frequency monitoring unit 112 only needs to monitor the time interval during which the stop _ switch signal continues to be at the high level, so as to determine whether the operating frequency of the voltage boost circuit 101 is the first predetermined threshold.
Optionally, in another embodiment of the present application, the operating frequency monitoring unit includes: and the counter is used for judging whether the duration time of the preset signal output by the control unit of the booster circuit reaches a preset time or not.
Optionally, an implementation manner of the counter, as shown in fig. 3, includes: a plurality of interconnected D flip-flops; wherein,
a clock input port of the head D trigger is used as an input port of the counter and used for receiving a clock signal; a first output port of the last D flip-flop is used as an output port of the counter; the clock input port of the latter D flip-flop is connected with the second output port of the former D flip-flop.
The reset port of each D trigger is input with a preset signal output by the control unit of the booster circuit.
When a preset signal output by the control unit of the booster circuit, namely a Stop _ switch signal, becomes a high level, the counter starts counting, if the counting time reaches a preset time, an output signal Fsw _ Slow of an output port of the counter is turned high, the working frequency of the booster circuit is lower than 20kHz, the switch needs to be controlled to be conducted, and a load resistor R is added to the output end of the booster circuit. So as to maintain the working frequency of the booster circuit higher than 20 kHz.
If the Stop _ switch signal goes low, i.e., goes low, before the count time reaches a predetermined time, the counter is cleared and Fsw _ Slow does not go high. It is necessary to wait for the next time Stop _ Switch goes high to restart counting.
Those skilled in the art can make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A boost circuit, comprising:
the load resistor is grounded at one end, and the other end of the load resistor is connected with the output end of the booster circuit through a switch;
the input end of the control unit is connected with the booster circuit, and the output end of the working frequency monitoring unit is connected with the control end of the switch.
2. The booster circuit according to claim 1, wherein the operating frequency monitoring unit monitors an operating frequency of the booster circuit in a pulse frequency modulation mode, and controls on/off of the switch according to the operating frequency of the booster circuit, and is configured to:
judging that the working frequency of the booster circuit is lower than a first preset threshold value, and controlling the switch to be conducted; judging that the working frequency of the booster circuit is higher than a second preset threshold value, and controlling the switch to be switched off; the second preset threshold is greater than a first preset threshold, and the first preset threshold is set according to the frequency of the booster circuit under the capacitance howling phenomenon.
3. A boost circuit in accordance with claim 2, wherein said first predetermined threshold comprises 20 KHz.
4. The booster circuit according to claim 2, wherein the manner in which the operating frequency monitoring unit determines whether the operating frequency of the booster circuit is lower than a first preset threshold value comprises:
the working frequency monitoring unit judges whether the duration time of a preset signal output by the control unit of the booster circuit reaches a preset time or not;
the working frequency monitoring unit judges that the duration time of a preset signal output by the control unit of the booster circuit reaches preset time, and then judges that the working frequency of the booster circuit is lower than a first preset threshold value.
5. The booster circuit according to claim 4, wherein the operating frequency monitoring unit includes: and the counter is used for judging whether the duration time of the preset signal output by the control unit of the booster circuit reaches a preset time or not.
6. The booster circuit according to claim 5, wherein the counter comprises: a plurality of interconnected D flip-flops; wherein,
a clock input port of the head D trigger is used as an input port of the counter and used for receiving a clock signal; a first output port of the last D flip-flop is used as an output port of the counter; the clock input port of the next D trigger is connected with the second output port of the previous D trigger;
the reset port of each D trigger is input with a preset signal output by the control unit of the booster circuit.
7. The booster circuit according to claim 1, wherein the resistance value of the load resistor is calculated by the formula: r ═ CoutX Δ V × F; wherein, CoutThe output capacitor is connected with the booster circuit, and delta V is an output voltage ripple of the booster circuit in a pulse frequency modulation mode; f is the lowest working frequency of the booster circuit.
8. The booster circuit according to claim 1, wherein the operating frequency monitoring unit, the switch and the load resistor are integrally disposed on a circuit board of the booster circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002914.6A CN108880255A (en) | 2018-08-30 | 2018-08-30 | Booster circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002914.6A CN108880255A (en) | 2018-08-30 | 2018-08-30 | Booster circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108880255A true CN108880255A (en) | 2018-11-23 |
Family
ID=64322530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811002914.6A Pending CN108880255A (en) | 2018-08-30 | 2018-08-30 | Booster circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108880255A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639110A (en) * | 2018-12-20 | 2019-04-16 | 上海艾为电子技术股份有限公司 | A kind of booster circuit and charger |
| CN111294446A (en) * | 2019-03-28 | 2020-06-16 | 紫光展讯通信(惠州)有限公司 | Power supply system circuit of terminal |
| CN112510977A (en) * | 2020-10-21 | 2021-03-16 | 苏州浪潮智能科技有限公司 | Howling suppression circuit and method |
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| CN111294446A (en) * | 2019-03-28 | 2020-06-16 | 紫光展讯通信(惠州)有限公司 | Power supply system circuit of terminal |
| CN111294446B (en) * | 2019-03-28 | 2021-05-18 | 紫光展讯通信(惠州)有限公司 | Power supply system circuit of terminal |
| CN112510977A (en) * | 2020-10-21 | 2021-03-16 | 苏州浪潮智能科技有限公司 | Howling suppression circuit and method |
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Country or region after: China Address after: Room 1201, No.2, Lane 908, Xiuwen Road, Minhang District, Shanghai, 201199 Applicant after: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Address before: Room 303-39, building 33, 680 Guiping Road, Xuhui District, Shanghai 200233 Applicant before: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region before: China |
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