CN106655749B - Power supply control circuit and switching power supply using same - Google Patents
Power supply control circuit and switching power supply using same Download PDFInfo
- Publication number
- CN106655749B CN106655749B CN201611022240.7A CN201611022240A CN106655749B CN 106655749 B CN106655749 B CN 106655749B CN 201611022240 A CN201611022240 A CN 201611022240A CN 106655749 B CN106655749 B CN 106655749B
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- power supply
- circuit
- current
- current source
- control circuit
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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
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a power supply control circuit and a switching power supply using the same, wherein the working current of a compensation circuit in an initial working state is controlled, so that a compensation capacitor is rapidly charged, the conduction time of a power switching tube can be prolonged, the charging capacity of an output voltage to a charging capacitor is enhanced, and after the power switching circuit is started for a period of time, the charging and discharging current of the compensation capacitor is switched to a normal working state. The invention can control the charging current of the compensation capacitor, thereby enhancing the charging capability of the output voltage to the charging capacitor, reducing the loss of the driving circuit, reducing the dependence on the compensation capacitor during starting by controlling the magnitude of the charging and discharging current, being insensitive to the switching time, and effectively avoiding the risks of lamp flickering and the like caused by overshoot.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a power supply control circuit and a switching power supply using the same.
Background
The schematic block diagram of the conventional LED driving circuit is shown in fig. 1, in which an external ac input voltage is rectified by a rectifier bridge to obtain a pulsating dc voltage VIN, and then the dc voltage VIN is converted by a switching circuit to generate an output voltage VO for supplying to a load, and a control circuit receives the dc voltage VIN, the output voltage VO and a sampling signal output by the switching circuit to generate a control signal for controlling a switching state in the switching circuit, so that the switching circuit outputs an expected output voltage signal.
As shown in fig. 2, the control circuit generally includes 5 sub-modules: the device comprises a power supply module, a sampling circuit, a compensation circuit, a turn-on/off control circuit and a driving circuit. The power supply module receives the direct-current voltage VIN and the output voltage VO to generate a power supply voltage for supplying power to all other submodules; the sampling circuit receives the sampling signal transmitted by the switching circuit, processes the sampling signal to obtain a sampling signal, and transmits the sampling signal to the compensation circuit; the compensation circuit obtains a compensation signal through compensation processing, the compensation signal is transmitted to the on-off control circuit to obtain a control signal of the switching circuit, and the control signal finally outputs a driving signal through the driving circuit to control the switching state of the switching circuit so as to regulate the output voltage VO. In general, as shown in fig. 3, the input structure of the power supply module includes a dc voltage VIN passing through a start resistor R0 to a capacitor C02, and an output voltage VO passing through a current-limiting resistor R1 and a flywheel diode D1 to the capacitor C02, and a voltage VCC across the capacitor C02 is a supply voltage. The direct-current voltage VIN charges the capacitor C02 through the starting resistor R0 to provide starting current for the control circuit, and after the chip begins to work, the output voltage VO begins to charge the capacitor C02 through the current-limiting resistor and the freewheeling diode, and the power supply voltage of the capacitor C02 supplies power to the whole control circuit through the power supply circuit to keep the system operating normally.
However, in actual work, in order to filter the power frequency ripple wave, the selection of the compensation capacitor in the compensation circuit and the output capacitor in the switching circuit is often very large, so that the rising of the output voltage VO after the driving circuit is started is very slow, and the on time of each switching period is very short, so that the effective charging capability of the output voltage VO in the power supply module to the capacitor C02 is very weak, a long time is required from the start of the driving circuit to the power supply balance of the power supply voltage VCC, the starting process can be completed only by frequent restarting for many times, and the starting time is very long, and even the starting process cannot be completed under the occasions such as continuous startup and shutdown.
Disclosure of Invention
In view of this, the present invention provides a power control circuit and a switching power supply using the same, which can enhance the charging capability of an output voltage to a charging capacitor by controlling the working current of a compensation circuit in an initial working state, thereby rapidly completing the power supply voltage requirement from start to normal operation.
The power supply control circuit comprises a compensation circuit, wherein the compensation circuit comprises a charging circuit, a discharging circuit and a compensation capacitor, the charging circuit charges the compensation capacitor through a pull-up current, and the discharging circuit discharges the compensation capacitor through a pull-down current;
wherein, in the starting stage of the power supply, the pull-up current and the pull-down current are respectively increased.
Further, the charging circuit includes a first current source and a second current source, the discharging circuit includes a third current source and a fourth current source,
a first end of the first current source and a first end of the second current source are connected to a point and a common connection end is connected to a voltage source, a second end of the first current source is connected to the compensation capacitor through a first switch, and a second end of the second current source is connected to the compensation capacitor;
the first terminal of the third current source is connected to the compensation capacitor through a second switch, the first terminal of the fourth current source is connected to the compensation capacitor, the second terminal of the third current source and the second terminal of the fourth current source are connected to a point and the common connection terminal is connected to ground.
Preferably, the first current source is (K1-1) times the size of the second current source; the third current source is (K2-1) times the fourth current source; both K2 and K1 are positive numbers greater than 1, and the value of K2 is greater than or equal to the value of K1.
Preferably, during a start-up phase of the power supply, the first switch and the second switch are controlled to be turned on;
and after a first time period of the power supply starting operation, the first switch and the second switch are controlled to be disconnected.
Further, the control circuit further comprises a power supply module, and the power supply module generates a power supply voltage for the control circuit according to an output voltage signal of the power supply;
in the starting stage of the power supply, the pull-up current is larger than the pull-down current, the voltage of the compensation capacitor in the power supply rises, and the power supply voltage output by the power supply module rises rapidly.
Further, the control circuit further comprises a sampling circuit which receives the output voltage signal or the output current signal of the power supply to generate a sampling current signal representing the output voltage signal or the output current signal and transmits the sampling current signal to the compensation circuit, wherein the sampling current signal is used as a current signal of a fourth current source of the compensation circuit.
Further, the control circuit also comprises an on-off control circuit and a driving circuit,
the on-off control circuit receives the compensation signal output by the compensation circuit to control the on time of the power switch tube in the power supply according to the compensation signal;
the driving circuit receives the output signal of the on-off control circuit to generate a driving signal to control the switching action of the power switch tube.
Preferably, the power supply control circuit is suitable for the occasion of continuous on-off.
A switching power supply according to the invention comprises a power stage circuit and the power supply control circuit described above,
the power supply control circuit receives the direct-current voltage output by the rectifier bridge and an output voltage signal or an output current signal of the power supply so as to generate a switch control signal to control the switching action of a power switch tube in the power stage circuit.
Preferably, the switching power supply is an LED driving circuit.
In summary, according to the power supply control circuit and the switching power supply using the same, the compensation capacitor can be charged rapidly by controlling the working current of the compensation circuit in the initial working state, so that the on time of the power switching tube is prolonged, the charging capacity of the output voltage to the charging capacitor can be enhanced, and then the charging and discharging current of the compensation capacitor is switched to the normal working state after the power switching tube is started for a period of time.
The invention can control the charging current of the compensation capacitor, not only enhance the charging capacity of the output voltage to the charging capacitor and reduce the loss of the driving circuit, but also reduce the dependence on the compensation capacitor during starting by controlling the magnitude of the charging and discharging current, is insensitive to the switching time, can effectively avoid the risks of lamp flickering and the like caused by overshoot, and can control the magnitude of the charging and discharging current proportion by programming so as to meet the starting requirements under different applications.
Drawings
Fig. 1 is a schematic block diagram of a conventional LED driving circuit;
FIG. 2 is a block diagram of the control circuit of FIG. 1;
FIG. 3 is an input block diagram of the power module of FIG. 2;
fig. 4 is a circuit diagram of a compensation circuit according to the present invention.
Detailed Description
Some preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
In the embodiment of the present invention, the LED driving circuit is taken as an example of the switching power supply, but the application of the control circuit of the present invention is not limited thereto, and the control circuit of the LED driving circuit is shown in fig. 2, and the structures and functions of the power supply module, the sampling circuit, the on-off control circuit and the driving circuit in the control circuit are the same as those in fig. 2, and are not described herein again. In contrast, the compensation circuit is improved in the present invention due to the slow start-up problem of the prior art.
Referring to fig. 4, there is shown a circuit diagram of a compensation circuit according to the present invention, the compensation circuit including a charging circuit, a discharging circuit and a compensation capacitor Cc, the charging circuit including a first current source I1 and a second current source I2, the discharging circuit including a third current source I3 and a fourth current source I4, a first terminal of the first current source I1 and a first terminal of the second current source I2 being connected to a point and a common connection terminal being connected to a voltage source, a second terminal of the first current source I1 being connected to the compensation capacitor Cc through a first switch S1, a second terminal of the second current source I2 being connected to the compensation capacitor Cc; wherein the first current source has a size (K1-1) times that of the second current source, and wherein the first current source has a size (K1-1) Iref when the second current source has a size Iref; the first terminal of the third current source I3 is connected to the compensation capacitor Cc through a second switch S2, the first terminal of the fourth current source I4 is connected to the compensation capacitor Cc, the second terminal of the third current source I3 and the second terminal of the fourth current source I4 are connected to a point and the common connection terminal is connected to ground, wherein the size of the third current source is (K2-1) times that of the fourth current source, and herein, assuming that the size of the fourth current source is Isen, the size of the third current source is (K2-1) Iref. Both K1 and K2 are positive numbers greater than 1, and the value of K2 is equal to or greater than K1.
The switch states of the first switch S1 and the second switch S2 are as follows: in the starting stage of the power supply, the first switch S1 and the second switch S2 are controlled to be conducted; after the first period of time (the first period of time can be set as required, and is generally set to 2 to 5 power frequency cycles) of the power supply starting operation, the first switch S1 and the second switch S2 are controlled to be turned off. The first switch S1 and the second switch S2 may be controlled by, for example, a switching signal in a switching power supply power stage circuit, but are not limited thereto.
As can be seen from the above circuit configuration, the currents of the first current source I1 and the second current source I2 are the pull-up current (i.e., the charging current) of the compensation capacitor Cc, and the currents of the third current source I3 and the fourth current source I4 are the pull-down current (i.e., the discharging current) of the compensation capacitor Cc.
It should be noted that, in the embodiment of the present invention, the current signal Isen of the fourth current source is a sampled current signal transmitted by the sampling circuit in fig. 2, and the sampling circuit receives the output voltage signal or the output current signal of the power supply, so as to generate a sampled current signal representing the output voltage signal or the output current signal, and transmit the sampled current signal to the compensation circuit, where the sampled current signal is used as the current signal of the fourth current source of the compensation circuit.
The working process of the embodiment of the invention is explained according to the circuit structure: after the switching power supply starts to work, the first switch S1 and the second switch S2 are conducted, at the moment, the pull-up current of the compensation capacitor Cc is K1 times Iref, the pull-down current is K2 times Isen, and when the switching power supply starts to start, the values of the K1 and the K2 are set to respectively increase the pull-up current and the pull-down current, so that the compensation capacitor Cc is rapidly charged; and because the on time of the power switch tube is short, the sampling current Isen is smaller than the pull-up current k1 Iref, the voltage at two ends of the compensation capacitor can be rapidly increased by selecting a larger k1 value, the on time of the power switch tube in the switch power supply can be prolonged along with the rapid increase of the voltage of the compensation capacitor, the charging capacity of the output voltage VO on the charging capacitor VCC is greatly enhanced, the power supply voltage output by the power supply module is rapidly increased, meanwhile, the sampling current Isen is also increased, the pull-up speed of the compensation capacitor is reduced, after the driving circuit works for a first time period, the first switch S1 and the second switch S2 are turned off, and the pull-up current and the pull-down current of the compensation capacitor are switched to a normal working state and finally reach a steady state. The first time period is a reasonable time, can be set according to specific conditions, and can be generally set to 1-5 power frequency periods.
In this embodiment, the average value of the current Iref and the sampling current Isen is equal in the steady operation state. According to the above process, the current control scheme of the embodiment of the invention can well realize the function of rapidly charging the charging capacitor by the output voltage in the starting process, thereby reducing the dependence on the size of the compensation capacitor in the starting process.
In addition, in order to prevent the influence of overshoot caused by too fast charging of the compensation capacitor in the charging process, the value of K2 is set to be larger than the value of K1 in design, so that the overshoot phenomenon can be effectively prevented, the switching from a starting working state to a normal current state is insensitive, the establishment of steady-state voltage of the compensation capacitor can be accelerated, and the charging capacity of the output voltage VO to the charging capacitor is greatly enhanced.
Theoretically, the larger the value of k1 and the value of k2, the faster the build-up of the compensation capacitor steady-state voltage, the less the dependence of the start-up on the size of the charging capacitor, but in practice the user can assign values to k1 and k2 by programming to meet the start-up requirements under different applications.
It should be noted that, the power control circuit in the embodiment of the present invention is suitable for the occasion of continuous switching, so as to complete the quick charge and reach the stable state in the starting process.
The above uses the switching power supply as the LED driving circuit as an example, but the control circuit of the power supply of the present invention can also be applied to suitable switching power supplies such as ac-dc voltage conversion circuits and dc-dc voltage conversion circuits. Although the embodiments of the present invention are ac inputs, the aspects of the present invention are equally applicable to dc inputs, as would be appreciated by one of ordinary skill in the art in light of the teachings of the present invention.
The power control circuit and the switching power supply using the same according to the preferred embodiments of the present invention have been described in detail, but the circuit and the advantages of the patent should not be construed as limited to the above description, and the disclosed embodiments and the accompanying drawings can be better understood, therefore, the above-described embodiments and the accompanying drawings are for better understanding of the present invention, the protection of the present invention is not limited to the scope of the disclosure, and the substitution and modification of the embodiments of the present invention by those skilled in the art are all within the protection scope of the present invention.
Claims (9)
1. A power supply control circuit comprises a compensation circuit, and is characterized in that,
the compensating circuit comprises a charging circuit, a discharging circuit and a compensating capacitor, wherein the charging circuit charges the compensating capacitor through pull-up current, and the discharging circuit discharges the compensating capacitor through pull-down current;
wherein, in the starting stage of the power supply, the pull-up current and the pull-down current are respectively increased;
the charging circuit includes a first current source and a second current source, the discharging circuit includes a third current source and a fourth current source,
a first end of the first current source and a first end of the second current source are connected to a point and a common connection end is connected to a voltage source, a second end of the first current source is connected to the compensation capacitor through a first switch, and a second end of the second current source is connected to the compensation capacitor;
the first terminal of the third current source is connected to the compensation capacitor through a second switch, the first terminal of the fourth current source is connected to the compensation capacitor, the second terminal of the third current source and the second terminal of the fourth current source are connected to a point and the common connection terminal is connected to ground.
2. The power control circuit of claim 1, wherein the first current source is (K1-1) times the size of the second current source; the third current source is (K2-1) times the fourth current source; both K2 and K1 are positive numbers greater than 1, and the value of K2 is greater than or equal to the value of K1.
3. The power control circuit of claim 2, wherein the first switch and the second switch are controlled to be turned on during a start-up phase of the power supply;
and after a first time period of the power supply starting operation, the first switch and the second switch are controlled to be disconnected.
4. The power control circuit of claim 1, further comprising a power supply module that generates a supply voltage for use by the control circuit based on an output voltage signal of the power supply;
in the starting stage of the power supply, the pull-up current is larger than the pull-down current, the voltage of the compensation capacitor in the power supply rises, and the power supply voltage output by the power supply module rises rapidly.
5. The power supply control circuit of claim 2, further comprising a sampling circuit that receives the output voltage signal or the output current signal of the power supply to generate a sampled current signal representative of the output voltage signal or the output current signal for transmission to the compensation circuit, the sampled current signal being a current signal of a fourth current source of the compensation circuit.
6. The power control circuit of claim 1, wherein the control circuit further comprises an on-off control circuit and a drive circuit,
the on-off control circuit receives the compensation signal output by the compensation circuit to control the on time of the power switch tube in the power supply according to the compensation signal;
the driving circuit receives the output signal of the on-off control circuit to generate a driving signal to control the switching action of the power switch tube.
7. The power control circuit of any one of claims 1-6, wherein the power control circuit is adapted for use in a continuous power on/off application.
8. A switching power supply comprising a power stage circuit and a power supply control circuit as claimed in any one of claims 1 to 7,
the power supply control circuit receives the direct-current voltage output by the rectifier bridge and an output voltage signal or an output current signal of the power supply so as to generate a switch control signal to control the switching action of a power switch tube in the power stage circuit.
9. The switching power supply of claim 8 wherein the switching power supply is an LED driver circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611022240.7A CN106655749B (en) | 2016-11-16 | 2016-11-16 | Power supply control circuit and switching power supply using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611022240.7A CN106655749B (en) | 2016-11-16 | 2016-11-16 | Power supply control circuit and switching power supply using same |
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| Publication Number | Publication Date |
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| CN106655749A CN106655749A (en) | 2017-05-10 |
| CN106655749B true CN106655749B (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611022240.7A Active CN106655749B (en) | 2016-11-16 | 2016-11-16 | Power supply control circuit and switching power supply using same |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947560A (en) * | 2017-12-15 | 2018-04-20 | 杰华特微电子（杭州）有限公司 | On-off circuit control circuit and on-off circuit |
| CN109862655A (en) * | 2018-10-17 | 2019-06-07 | 矽力杰半导体技术(杭州)有限公司 | Integrated circuit, Dimmable LED driving circuit and its driving method |
| TWI754947B (en) * | 2020-05-29 | 2022-02-11 | 大陸商北京集創北方科技股份有限公司 | DC-DC conversion circuit and information processing device |
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| CN106655749A (en) | 2017-05-10 |
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| CB02 | Change of applicant information |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |