CN112242786B - Power supply device - Google Patents
Power supply device Download PDFInfo
- Publication number
- CN112242786B CN112242786B CN201910648495.1A CN201910648495A CN112242786B CN 112242786 B CN112242786 B CN 112242786B CN 201910648495 A CN201910648495 A CN 201910648495A CN 112242786 B CN112242786 B CN 112242786B
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- coupled
- node
- output voltage
- 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.)
- Active
Links
Images
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
- H02M1/00—Details of apparatus for conversion
-
- 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
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
Abstract
The invention provides a power supply device. The power supply device comprises a pulse width modulation signal generating circuit, a power conversion circuit, a voltage division circuit, a capacitor circuit and a feedback compensation circuit. The PWM signal generating circuit generates and modulates a PWM signal according to the feedback signal. The power conversion circuit converts the input voltage into the output voltage according to the pulse width modulation signal. The voltage division circuit divides the output voltage to generate a first voltage to the node. The capacitor circuit responds to the voltage change of the output voltage and generates a second voltage to the node according to the output voltage. Before the output voltage is ready, the feedback compensation circuit generates a feedback signal according to the first voltage and the reference voltage. After the output voltage is ready, the feedback compensation circuit generates a feedback signal according to the second voltage and the reference voltage.
Description
Technical Field
The present invention relates to power supply technologies, and particularly to a power supply apparatus capable of increasing feedback response speed.
Background
Generally, in a pwm-based power supply apparatus, the power supply apparatus usually has a feedback circuit and a pwm controller. The feedback circuit can provide a feedback signal according to the load change (no-load, light load, medium load, full load) of the power supply device, and the pwm controller can correspondingly adjust the duty cycle or frequency of the pwm signal according to the feedback signal, so as to stabilize the output voltage provided by the power supply device.
Since the load varies widely from no-load to heavy-load, the frequency of the pwm signal varies greatly, which makes the gain and bandwidth of the feedback circuit difficult to control, and makes the feedback response speed of the feedback circuit unable to keep up with the pwm signal or the load. As a result, the output voltage is unstable.
Disclosure of Invention
In view of the above, the present invention provides a power supply apparatus. The power supply device can quickly provide a feedback signal in response to the voltage change of the output voltage so as to improve the feedback reaction speed and provide stable output voltage.
The power supply device comprises a pulse width modulation signal generating circuit, a power conversion circuit, a voltage division circuit, a capacitor circuit and a feedback compensation circuit. The PWM signal generating circuit is used for generating and modulating a PWM signal according to the feedback signal. The power conversion circuit is coupled to the pwm signal generating circuit to receive the pwm signal and convert the input voltage into the output voltage according to the pwm signal. The voltage divider circuit is coupled to the power conversion circuit to receive the output voltage and divides the output voltage to generate a first voltage to the node. The capacitor circuit is coupled to the power conversion circuit to receive the output voltage, and is used for generating a second voltage to the node according to the output voltage in response to the voltage change of the output voltage. The feedback compensation circuit is coupled to the node and the PWM signal generating circuit. Before the output voltage is ready, the feedback compensation circuit generates a feedback signal according to the first voltage and the reference voltage. After the output voltage is ready, the feedback compensation circuit generates a feedback signal according to the second voltage and the reference voltage.
Based on the above, in the power supply apparatus provided in the embodiment of the invention, the capacitor circuit can rapidly provide the second voltage to the feedback compensation circuit in response to the voltage variation of the output voltage, so that the feedback response speed of the power supply apparatus can be increased, and the compensation speed of the output voltage can be increased to stabilize the output voltage.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a block diagram of a power supply apparatus according to an embodiment of the invention;
FIG. 2 is a schematic circuit diagram of the power supply apparatus of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a power supply apparatus according to another embodiment of the invention;
FIG. 4A is a schematic diagram illustrating the charging of a capacitor circuit according to an embodiment of the present invention;
FIG. 4B is a schematic diagram illustrating the discharging of the capacitor circuit according to an embodiment of the present invention;
fig. 5 is a circuit architecture diagram of a discharge circuit according to an embodiment of the invention.
The reference numbers illustrate:
100. 300, and (2) 300: power supply device
110: pulse width modulation signal generating circuit
120: power supply conversion circuit
130: voltage divider circuit
140: capacitor circuit
150: feedback compensation circuit
151: error amplifying circuit
152: optical coupler
1511: operational amplifier
360. 560: discharge circuit
561: comparator with a comparator circuit
C41: capacitor with a capacitor element
C51: first capacitor
C52: second capacitor
C53: third capacitor
CG: control signal
D41: first diode
D62: second diode
E1, E2: terminal end
GND: grounding terminal
M1: transistor with a metal gate electrode
ND: node point
R31, R51: a first resistor
R32, R52: second resistor
SFB: feedback signal
SP: pulse width modulation signal
T1, T2: input terminal
V1: first voltage
V2: second voltage
VE: error amplified signal
VF: cut-in voltage
VI: input voltage
VO: output voltage
VREF: reference voltage
Detailed Description
Fig. 1 is a block diagram of a power supply device according to an embodiment of the invention. Referring to fig. 1, the power supply apparatus 100 may be, for example, a variable-frequency and voltage-stabilizing power supply apparatus, but is not limited thereto. The power supply apparatus 100 may include a pwm signal generating circuit 110, a power converting circuit 120, a voltage dividing circuit 130, a capacitor circuit 140, and a feedback compensating circuit 150, but the invention is not limited thereto. The pwm signal generating circuit 110 is configured to generate a pwm signal SP according to a feedback signal SFB, and modulate at least one of a frequency and a duty cycle of the pwm signal SP according to the feedback signal SFB. The power conversion circuit 120 is coupled to the pwm signal generating circuit 110 for receiving the pwm signal SP. The power conversion circuit 120 can convert the input voltage VI into the output voltage VO according to the pwm signal SP.
The voltage divider circuit 130 is coupled to the power conversion circuit 120 to receive the output voltage VO and divides the output voltage VO to generate a first voltage V1 to a node ND. The capacitor circuit 140 is coupled to the power conversion circuit 120 to receive the output voltage VO, and generates a second voltage V2 to the node ND according to the output voltage VO in response to a voltage variation of the output voltage VO. The feedback compensation circuit 150 is coupled to the node ND and the pwm signal generating circuit 110, and is configured to generate the feedback signal SFB according to the voltage of the node ND and the reference voltage VREF.
In detail, before the output voltage VO is ready, the feedback compensation circuit 150 generates the feedback signal SFB according to the first voltage V1 and the reference voltage VREF generated by the voltage dividing circuit 130, so that the pwm signal generating circuit 110 generates the pwm signal SP according to the feedback signal SFB to control the power conversion circuit 120 to generate the output voltage VO. After the output voltage VO is ready, the feedback compensation circuit 150 may generate the feedback signal SFB according to the second voltage V2 generated by the capacitor circuit 140 and the reference voltage VREF, and the pwm signal generating circuit 110 may modulate at least one of a frequency and a duty cycle of the pwm signal SP according to the feedback signal SFB, so that the power conversion circuit 120 provides the stable output voltage VO according to the pwm signal SP.
It can be understood that, based on the characteristic that the capacitance circuit 140 has a fast response speed to the voltage variation, the capacitance circuit 140 can quickly provide the second voltage V2 to the feedback compensation circuit 150 in response to the voltage variation of the output voltage VO, so that the feedback response speed of the power supply apparatus 100 can be increased, and thus the compensation speed for the output voltage VO can be increased to provide the stable output voltage VO.
In an embodiment of the invention, the pwm signal generating circuit 110 can be implemented by a conventional pwm integrated circuit, but is not limited thereto.
In an embodiment of the present invention, the power conversion circuit 120 may be implemented by various types of isolated power conversion circuits, but is not limited thereto.
In an embodiment of the invention, the output voltage VO is ready, for example, the voltage value of the output voltage VO has risen to a predetermined voltage value for a period of time, but the invention is not limited thereto. The predetermined voltage value can be set according to the actual application.
Fig. 2 is a schematic circuit diagram of the power supply apparatus shown in fig. 1 according to an embodiment of the invention. Please refer to fig. 2. The voltage divider circuit 130 may include a first resistor R31 and a second resistor R32, but is not limited thereto. A first terminal of the first resistor R31 receives the output voltage VO. A second terminal of the first resistor R31 is coupled to the node ND. A first end of the second resistor R32 is coupled to the node ND. The second end of the second resistor R32 is coupled to the ground GND.
The capacitor circuit 140 may include, but is not limited to, a capacitor C41 and a first diode D41. A first terminal of the capacitor C41 receives the output voltage VO. An anode of the first diode D41 is coupled to a second terminal of the capacitor C41. The cathode of the first diode D41 is coupled to the node ND.
The feedback compensation circuit 150 may include an error amplifying circuit 151 and an optical coupler 152, but is not limited thereto. The error amplifying circuit 151 is coupled to the node ND, and is configured to amplify a difference between a voltage of the node ND and a reference voltage VREF to generate an error amplified signal VE. The optical coupler 152 is coupled between the error amplifier 151 and the pwm signal generator 110, and is configured to generate a feedback signal SFB according to the error amplifier VE and provide the feedback signal SFB to the pwm signal generator 110.
In an embodiment of the invention, the error amplifying circuit 151 may include, but is not limited to, an operational amplifier 1511, a first resistor R51, a first capacitor C51, a second capacitor C52, a second resistor R52, and a third capacitor C53. The inverting input terminal of the operational amplifier 1511 is coupled to the node ND. The non-inverting input of the operational amplifier 1511 receives a reference voltage VREF. The output terminal of the operational amplifier 1511 is coupled to the optical coupler 152 to provide the error amplified signal VE. A first terminal of the first resistor R51 receives the output voltage VO. The first capacitor C51 is coupled between the second end of the first resistor R51 and the node ND. The second capacitor C52 is coupled between the node ND and the output of the operational amplifier 1511. A first end of the second resistor R52 is coupled to the node ND. The third capacitor C53 is coupled between the second end of the second resistor R52 and the output of the operational amplifier 1511.
Before the output voltage VO is ready, the first resistor R31 and the second resistor R32 may divide the output voltage VO to provide a first voltage V1 to the node ND (i.e., establish the first voltage V1 at the node ND), wherein the first voltage V1 is as shown in formula (1).
After the output voltage VO is ready, the first diode D41 may be turned on in response to the voltage variation of the output voltage VO, so the capacitor C41, the first diode D41 and the second resistor R32 form a charging current path, such that the capacitor C41 is charged according to the output voltage VO, and may provide a second voltage V2 to the node ND through the first diode D41 (i.e., establish the second voltage V2 at the node ND), wherein the second voltage V2 is equal to the difference between the output voltage VO and the Cut-in voltage VF of the first diode D41, as shown in formula (2).
V2 is VO-VF formula (2)
In addition, when the output voltage VO is stabilized, the voltage of the node ND is equal to the reference voltage VREF, and the first diode D41 is turned off.
It can be understood that, since the capacitor C41 has a faster response speed to the voltage variation than the resistors (i.e., the first resistor R31 and the second resistor R32), the capacitor C41 can quickly provide the second voltage V2 to the feedback compensation circuit 150 in response to the voltage variation of the output voltage VO, so as to increase the feedback response speed of the power supply apparatus 100 to quickly stabilize the output voltage VO.
In one embodiment of the present invention, the resistance of the first resistor R31 is much larger than the resistance of the first resistor R51. For example, the resistance value of the first resistor R31 is more than ten times greater than that of the first resistor R51, but the present invention is not limited thereto.
In an embodiment of the invention, the resistance value of the first resistor R51 is 10 kilo-ohms (K Ω), the capacitance value of the first capacitor C51 is 1 nano-farad (nF), the resistance value of the first resistor R31 is 68.1 kilo-ohms, the resistance value of the second resistor R32 is 19.2 kilo-ohms, and the capacitance value of the capacitor C41 is 100 nano-farads, but the invention is not limited thereto.
In an experimental result of the above embodiment of the invention, when the output voltage VO changes, if the feedback compensation circuit 150 generates the feedback signal SFB to the pwm signal generating circuit 110 according to the second voltage V2 generated by the capacitor circuit 140 and the reference voltage VREF, the feedback response time delay of the power supply apparatus 100 is 568 milliseconds (ms). On the contrary, when the output voltage VO changes, if the feedback compensation circuit 150 generates the feedback signal SFB to the pwm signal generating circuit 110 according to the first voltage V1 and the reference voltage VREF generated by the voltage dividing circuit 130, the feedback response time delay of the power supply apparatus 100 is 1966 milliseconds. According to the experimental results, the capacitor circuit 140 can effectively increase the feedback response speed of the power supply apparatus 100.
Fig. 3 is a schematic circuit diagram of a power supply apparatus according to another embodiment of the invention. Please refer to fig. 2 and fig. 3. The power supply apparatus 300 of fig. 3 is similar to the power supply apparatus 100 of fig. 2, and the difference between them is only: the power supply apparatus 300 of fig. 3 further includes a discharge circuit 360. The discharging circuit 360 is coupled between the second terminal of the capacitor C41 and the ground GND. When the voltage at the node ND is equal to the reference voltage VREF (i.e., when the output voltage VO is stable), the energy stored in the capacitor C41 can be discharged through the discharging circuit 360 to prevent the capacitor C41 from resonating with the first capacitor C51 and the second capacitor C52 due to the energy stored in the capacitor C41.
In an embodiment of the invention, as shown in fig. 3, the discharge circuit 360 may include a second diode D62. The anode of the second diode D62 is coupled to the ground GND, and the cathode of the second diode D62 is coupled to the second terminal of the capacitor C41. After the output voltage VO is ready, the first diode D41 may be turned on in response to a voltage change of the output voltage VO, and the second diode D62 may be turned off in response to the voltage change of the output voltage VO. Therefore, the capacitor C41, the first diode D41 and the second resistor R32 form a charging current path, such that the capacitor C41 charges according to the output voltage VO and provides the second voltage V2 to the node ND through the first diode D41, as shown in fig. 4A.
When the voltage at the node ND is equal to the reference voltage VREF (i.e., the output voltage VO is stable), the first diode D41 is turned off and the second diode D62 is turned on, so that the energy stored in the capacitor C41 will be discharged through the second diode D62. In detail, as shown in fig. 4B, when the voltage at the node ND is equal to the reference voltage VREF, the second diode D62, the capacitor C41, the first resistor R51, the first capacitor C51 and the second resistor R32 form a discharging current path to discharge the electric energy stored in the capacitor C41.
In addition, for details and operations of the power supply apparatus 300 of fig. 3, reference may be made to the above description of fig. 1 and fig. 2, and further description is omitted here.
Fig. 5 is a circuit architecture diagram of a discharge circuit according to another embodiment of the invention, which can be used to replace the discharge circuit 360 shown in fig. 3. Referring to fig. 3 and 5, the discharging circuit 560 of fig. 5 may include a comparator 561 and a transistor M1. The input terminal T1 of the comparator 561 is coupled to the node ND in fig. 3. The input terminal T2 of the comparator 561 receives the reference voltage VREF of fig. 3. The comparator 561 may compare the voltage of the node ND with the reference voltage VREF to generate the control signal CG. The first terminal E1 and the second terminal E2 of the transistor M1 are coupled to the second terminal of the capacitor C41 of fig. 3 and the ground GND, respectively. The control terminal of the transistor M1 is coupled to the comparator 561 for receiving the control signal CG. The transistor M1 is turned on and off by the control signal CG.
When the voltage at the node ND is equal to the reference voltage VREF (i.e., when the output voltage VO of fig. 3 is stable), the transistor M1 is turned on in response to the control signal CG, so that the power stored in the capacitor C41 is discharged through the transistor M1. In addition, when the voltage of the node ND is not equal to the reference voltage VREF (i.e., when the output voltage VO of fig. 3 is unstable), the transistor M1 is turned off in response to the control signal CG, so that the capacitor C41 stops discharging.
In summary, in the power supply apparatus provided in the embodiments of the invention, the capacitor circuit can rapidly provide the second voltage to the feedback compensation circuit in response to the voltage variation of the output voltage, so that the feedback response speed of the power supply apparatus can be increased, and the compensation speed of the output voltage can be increased to stabilize the output voltage.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A power supply device, comprising:
a PWM signal generating circuit for generating and modulating a PWM signal according to the feedback signal;
a power conversion circuit coupled to the pwm signal generating circuit to receive the pwm signal and convert an input voltage into an output voltage according to the pwm signal;
the voltage division circuit is coupled with the power conversion circuit to receive the output voltage and divides the output voltage to generate a first voltage to a node;
a capacitance circuit coupled to the power conversion circuit to receive the output voltage, and configured to generate a second voltage to the node according to the output voltage in response to a voltage variation of the output voltage, wherein the capacitance circuit includes a capacitor, and a first terminal of the capacitor receives the output voltage; and a first diode, an anode of the first diode being coupled to the second terminal of the capacitor, and a cathode of the first diode being coupled to the node;
a feedback compensation circuit coupled to the node and the pwm signal generation circuit, wherein the feedback compensation circuit generates the feedback signal according to the first voltage and a reference voltage before the output voltage is ready, wherein the feedback compensation circuit generates the feedback signal according to the second voltage and the reference voltage after the output voltage is ready; and
a discharge circuit coupled between the second terminal of the capacitor and a ground terminal, wherein the discharge circuit includes a second diode, an anode of the second diode is coupled to the ground terminal, and a cathode of the second diode is coupled to the second terminal of the capacitor,
wherein when the voltage of the node is equal to the reference voltage, the first diode is turned off, and the second diode, the capacitor, the first resistor, the first capacitor, and the second resistor form a discharge current path to discharge the electric energy stored by the capacitor.
2. The power supply device according to claim 1, wherein:
after the output voltage is ready, the first diode is turned on in response to a voltage change of the output voltage, causing the capacitor to charge according to the output voltage, and providing the second voltage to the node through the first diode, wherein the second voltage is equal to a difference between the output voltage and a cut-in voltage of the first diode.
3. The power supply device according to claim 2, wherein the first diode is turned off when the voltage of the node is equal to the reference voltage.
4. The power supply device according to claim 3,
wherein the second diode is turned off in response to a voltage change of the output voltage after the output voltage is ready.
5. The power supply device according to claim 3, wherein the discharge circuit includes:
a comparator to compare a voltage of the node with the reference voltage to generate a control signal; and
a transistor coupled between the second terminal of the capacitor and the ground terminal and turned on and off by the control signal,
wherein when the voltage of the node is equal to the reference voltage, the transistor is turned on in response to the control signal and the capacitor discharges the stored energy through the transistor,
wherein the transistor is turned off in response to the control signal when the voltage of the node is not equal to the reference voltage.
6. The power supply device according to claim 1, wherein the voltage dividing circuit comprises:
the first resistor, a first end of the first resistor receiving the output voltage, and a second end of the first resistor coupled to the node; and
a first end of the second resistor is coupled to the node, and a second end of the second resistor is coupled to the ground.
7. The power supply device according to claim 1, wherein the feedback compensation circuit comprises:
an error amplifying circuit, coupled to the node, for amplifying a difference between a voltage of the node and the reference voltage to generate an error amplified signal; and
and the optical coupler is coupled between the error amplification circuit and the pulse width modulation signal generation circuit and used for generating the feedback signal according to the error amplification signal and providing the feedback signal to the pulse width modulation signal generation circuit.
8. The power supply device according to claim 7, wherein the error amplification circuit comprises:
an inverting input terminal of the operational amplifier is coupled to the node, a non-inverting input terminal of the operational amplifier receives the reference voltage, and an output terminal of the operational amplifier is coupled to the optical coupler to provide the error amplification signal;
the first resistor, a first end of the first resistor receiving the output voltage;
the first capacitor coupled between the second end of the first resistor and the node;
a second capacitor coupled between the node and the output of the operational amplifier;
the second resistor, a first end of the second resistor being coupled to the node; and
a third capacitor coupled between a second end of the second resistor and the output of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910648495.1A CN112242786B (en) | 2019-07-18 | 2019-07-18 | Power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910648495.1A CN112242786B (en) | 2019-07-18 | 2019-07-18 | Power supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112242786A CN112242786A (en) | 2021-01-19 |
| CN112242786B true CN112242786B (en) | 2022-01-11 |
Family
ID=74167890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910648495.1A Active CN112242786B (en) | 2019-07-18 | 2019-07-18 | Power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112242786B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114038395B (en) * | 2021-07-26 | 2022-12-27 | 重庆康佳光电技术研究院有限公司 | Power supply driving circuit, driving method and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626976A (en) * | 1984-01-23 | 1986-12-02 | Hitachi, Ltd. | Switch mode power supply having magnetically controlled output |
| CN202103576U (en) * | 2011-06-30 | 2012-01-04 | 成都芯源系统有限公司 | Switch converter and control circuit thereof |
| CN204993057U (en) * | 2015-06-10 | 2016-01-20 | 上海灿瑞科技股份有限公司 | Step -down direct current transducer |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369558B2 (en) * | 2000-06-23 | 2002-04-09 | Rohm Co., Ltd. | Switching regulator |
| KR100869807B1 (en) * | 2007-04-06 | 2008-11-21 | 삼성에스디아이 주식회사 | Power Factor Corrector |
| US8125800B2 (en) * | 2007-10-17 | 2012-02-28 | Texas Instruments Incorporated | Secondary-side amplifier with soft start |
| CN102751872B (en) * | 2011-04-21 | 2016-04-06 | 登丰微电子股份有限公司 | Feedback control circuit |
| US10013003B2 (en) * | 2012-11-16 | 2018-07-03 | Linear Technology Corporation | Feed forward current mode switching regulator with improved transient response |
| US9543834B2 (en) * | 2013-04-26 | 2017-01-10 | Fujitsu Ten Limited | Switching regulator, electronic device, and electronic circuit |
| JP6946878B2 (en) * | 2017-09-13 | 2021-10-13 | 富士電機株式会社 | Power factor improvement circuit and switching power supply using this |
-
2019
- 2019-07-18 CN CN201910648495.1A patent/CN112242786B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626976A (en) * | 1984-01-23 | 1986-12-02 | Hitachi, Ltd. | Switch mode power supply having magnetically controlled output |
| CN202103576U (en) * | 2011-06-30 | 2012-01-04 | 成都芯源系统有限公司 | Switch converter and control circuit thereof |
| CN204993057U (en) * | 2015-06-10 | 2016-01-20 | 上海灿瑞科技股份有限公司 | Step -down direct current transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112242786A (en) | 2021-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102145165B1 (en) | Switching regulator and electronic apparatus | |
| US9991775B1 (en) | Constant on-time converter having fast transient response | |
| US8063684B2 (en) | Pulse width modulated controller applied to switch-type voltage regulator | |
| TWI435522B (en) | Charge pump controller and method therefor | |
| WO2006059705A1 (en) | Switching power supply and its control circuit, and electronic apparatus employing such switching power supply | |
| US20160156264A1 (en) | Dc-dc converter | |
| US10122278B1 (en) | Control circuit operating in pulse skip mode and voltage converter having the same | |
| CN109428487B (en) | Switch regulator | |
| WO2020077553A8 (en) | A voltage regulator with an adaptive off-time generator | |
| US11837848B2 (en) | High PRF, high efficiency laser diode driver power supply | |
| CN112242786B (en) | Power supply device | |
| US10060954B2 (en) | Load capacitance determination circuitry and power supply control | |
| CN108900082B (en) | Switching power supply conversion system | |
| KR101412807B1 (en) | Triangular waveform generating apparatus | |
| CN112804786B (en) | LED drive circuit and control circuit thereof | |
| CN116015061A (en) | Slope compensation circuit, method for generating ramp compensation signal and electronic chip | |
| JPH05251800A (en) | He-ne laser power supply | |
| US11502601B2 (en) | Control circuit and control method of power converter | |
| TWI710887B (en) | Power supply apparatus | |
| US7298121B2 (en) | Circuit and method for increasing the stability of switch-mode power supplies | |
| TW201432404A (en) | Voltage regulator circuit | |
| KR102301354B1 (en) | Error amplifier and power converter including thereof | |
| CN110677031A (en) | Soft start circuit of power control chip | |
| KR102502763B1 (en) | Soft start-up circuit with capacitor sharing method, switch control circuit and dc-dc converter comprising the same | |
| KR101696403B1 (en) | Soft start circuit of switching regulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |