CN211655982U - Switching power supply and lighting driving circuit - Google Patents
Switching power supply and lighting driving circuit Download PDFInfo
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- CN211655982U CN211655982U CN202020205476.XU CN202020205476U CN211655982U CN 211655982 U CN211655982 U CN 211655982U CN 202020205476 U CN202020205476 U CN 202020205476U CN 211655982 U CN211655982 U CN 211655982U
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- control unit
- leakage detection
- circuit
- main power
- power supply
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- 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
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal 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 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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- 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
- H02M1/0009—Devices or circuits for detecting current in a converter
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- 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]
-
- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses a switching power supply and lighting driving circuit, which comprises a power level circuit and a control circuit, wherein the control circuit is connected with the control end of the power level circuit; the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power level circuit, and the leakage detection control unit controls a main power tube in the power level circuit to be conducted for the first time to realize leakage detection; the power conversion control unit controls the switching of a main power tube switch in the power level circuit to realize power conversion. The utility model discloses multiplexed topological structure in order to realize earth leakage protection, promote the security in the load dismouting in-process.
Description
Technical Field
The utility model relates to a power electronic technology field, in particular to switching power supply and lighting drive circuit.
Background
The safety of the switching power supply is particularly important when the switching power supply is used for realizing input-to-output power conversion. For example, when a load is powered by a switching power supply, a part of the load may be turned on during installation, and if a human body is accidentally touched, the electric shock is easily caused, which affects the safety of operation. Therefore, the arrangement of the leakage protection in the switching power supply is beneficial to avoiding or reducing the condition of electric shock of a human body and improving the safety performance of the switching power supply.
However, in the prior art, a dedicated leakage protection circuit needs to be provided for leakage protection of the switching power supply, which increases circuit cost and power consumption.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multiplexing topological structure is in order to realize earth leakage protection function's switching power supply and lighting drive circuit to promote the security of load dismouting process.
In order to achieve the above object, the present invention provides a switching power supply, which includes a power stage circuit and a control circuit, wherein the control circuit is connected to a control end of the power stage circuit;
the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power level circuit, and the leakage detection control unit controls a main power tube in the power level circuit to be conducted for the first time to realize leakage detection; the power conversion control unit controls the switching of a main power tube switch in the power level circuit to realize power conversion.
Optionally, the control circuit further includes a leakage detection determining unit, where the leakage detection determining unit receives a current sampling signal representing a current flowing through the main power tube, and compares the current sampling signal with a first reference value to obtain a determination result representing whether leakage occurs.
Optionally, when the current sampling signal is greater than the first reference value, the determination result indicates that no leakage occurs, and according to the determination result, the control of the leakage detection control unit on the main power tube is disconnected, and the control of the main power tube by the power conversion control unit is switched; and when the current sampling signal is smaller than the first reference value, the judgment result represents that the electric leakage phenomenon occurs, and the electric leakage detection control unit keeps controlling the main power tube according to the judgment result to continuously perform electric leakage detection.
Optionally, after the switching power supply is powered on, delaying a second time or detecting that the input voltage value, the drain-source voltage value of the main power tube or the voltage value of the load negative terminal reaches a set threshold, the leakage detection control unit controls the main power tube to be conducted for a first time, so as to achieve leakage detection.
Optionally, the leakage detection determining unit includes a voltage detecting unit, the voltage detecting unit detects a voltage at the power input terminal, a drain-source voltage of the main power tube, or a voltage at the negative terminal of the load to obtain a voltage detection signal, and the voltage detection signal controls the main power tube to be turned on for a first time when reaching a second reference value representing the set threshold.
Optionally, the voltage at the input end of the power supply is a voltage at two ends of the alternating current input after being rectified by the rectifier bridge or a voltage between one end of the rectifier bridge and one end of the alternating current input.
Optionally, the switching power supply further includes a sampling resistor, one end of the sampling resistor is connected to the main power transistor, and the other end of the sampling resistor is grounded.
Another technical solution of the present invention is to provide an illumination driving circuit, including:
the rectifier bridge receives an alternating current input power supply and rectifies the alternating current input;
the switching power supply comprises a power level circuit and a control circuit, wherein the control circuit is connected with the control end of the power level circuit;
the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power level circuit, and the leakage detection control unit controls a main power tube in the power level circuit to be conducted for the first time to realize leakage detection; the power conversion control unit controls the switching of a main power tube switch in the power level circuit to realize power conversion.
Optionally, the control circuit further includes a leakage detection determining unit, where the leakage detection determining unit receives a current sampling signal representing a current flowing through the main power tube, and compares the current sampling signal with a first reference value to obtain a determination result representing whether leakage occurs.
Optionally, when the current sampling signal is greater than the first reference value, the determination result indicates that no leakage occurs, and according to the determination result, the control of the leakage detection control unit on the main power tube is disconnected, and the control of the main power tube by the power conversion control unit is switched; and when the current sampling signal is smaller than the first reference value, the judgment result represents that the electric leakage phenomenon occurs, and the electric leakage detection control unit keeps controlling the main power tube according to the judgment result to continuously perform electric leakage detection.
Compared with the prior art, the technical scheme of the utility model has following advantage: the utility model discloses reuse the main power tube among the power level circuit, realized earth leakage protection's function to can switch between electric leakage detection mode and power conversion mode, need not other dedicated earth leakage protection circuit, promote the security of load dismouting in-process.
Drawings
Fig. 1 is a schematic structural diagram of the switching power supply of the present invention;
fig. 2 is a schematic structural diagram of the input voltage detection unit.
Detailed Description
The 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 to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
As shown in fig. 1, the basic structure of the switching power supply of the present invention is illustrated, and when the load is an LED, the switching power supply can be used for a lighting driving circuit. The switching power supply comprises a power level circuit and a control circuit, wherein the control circuit is connected with the control end of the power level circuit;
the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power stage circuit, and the leakage detection control unit controls a main power tube Q1 in the power stage circuit to be conducted for a first time t1 so as to realize leakage detection; the power conversion control unit controls the switching of a main power tube Q1 switch in the power stage circuit to realize power conversion.
The control circuit further comprises a leakage detection judging unit, wherein the leakage detection judging unit receives a current sampling signal VS representing the current flowing through the main power tube, and compares the current sampling signal VS with a first reference value Verf1 to obtain a judgment result representing whether leakage exists. The leakage detection judging unit comprises a comparator U2, and two input ends of the comparator U2 respectively receive the current sampling signal VS and a first reference value Verf 1. When the current sampling signal VS is greater than the first reference value Verf1, the judgment result indicates that no leakage occurs, and according to the judgment result, the control of the leakage detection control unit on the main power tube Q1 is switched and the control of the power conversion control unit on the main power tube Q1 is switched; when the current sampling signal VS is smaller than the first reference value Verf1, the judgment result represents that a leakage phenomenon occurs, and according to the judgment result, the leakage detection control unit keeps control over the main power tube Q1 to continuously perform leakage detection.
After the switching power supply is powered on, delaying a second time t2 or detecting that an input voltage value, a drain source voltage value Vds of the main power tube or a voltage value of a load negative end reaches a set threshold, and controlling the main power tube Q1 to be conducted for the first time t1 by the leakage detection control unit to realize leakage detection. The second time t2 can be set as required, but a mode of detecting that the input voltage value reaches a set threshold value is adopted, so that the reliability is higher, that is, the first reference value Verf1 can be set according to the input voltage value, the sampling resistor RS value, the resistance value possibly caused by electric leakage and other factors. The leakage detection and judgment unit includes an input voltage detection unit, as shown in fig. 2, the voltage detection unit detects a voltage Vin at the power input end to obtain a voltage detection signal Vd, and when the voltage detection signal Vd reaches a second reference value Vref2 representing the set threshold, the main power transistor Q1 is controlled to be turned on for a first time t 1. In this embodiment, the detection may also be implemented by detecting a drain-source voltage value Vds of the main power transistor or a negative-terminal voltage value of the load, for example, in fig. 1, a position where the dashed line of the leakage detection control unit is connected is respectively used to detect the drain-source voltage value Vds of the main power transistor or the negative-terminal voltage value of the load, where the drain-source voltage value Vds of the main power transistor may be represented by a drain-terminal voltage Vd, or may be represented by a difference Vs between the drain-terminal voltage Vd and a source-terminal voltage Vs. Fig. 2 shows only an example of detecting the input voltage Vin, and reference may be made to this example for detecting the drain-source voltage value Vds of the main power tube or the voltage value of the negative terminal of the load. Regarding the second reference value Vref2, in the present embodiment, the second reference value Vref2 is used for all three detection methods mainly for unified presentation, but the second reference values Vref2 in the three detection methods may be different, and of course, the methods of adjusting the voltage dividing resistors according to fig. 2 may also be uniformly set to the same second reference value Vref 2.
The voltage of the input end of the power supply is the voltage of two ends of the alternating current input after being rectified by the rectifier bridge or the voltage between one end of the rectifier bridge and one end of the alternating current input.
The switching power supply further comprises a sampling resistor RS, one end of the sampling resistor RS is connected with the main power tube Q1, and the other end of the sampling resistor RS is grounded.
As shown in fig. 1, another technical solution of the present invention is to provide a lighting driving circuit, including:
the rectifier bridge receives an alternating current input power supply and rectifies the alternating current input;
the switching power supply comprises a power level circuit and a control circuit, wherein the control circuit is connected with the control end of the power level circuit;
the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power level circuit, and the leakage detection control unit controls a main power tube in the power level circuit to be conducted for the first time to realize leakage detection; the power conversion control unit controls the switching of a main power tube switch in the power level circuit to realize power conversion.
The control circuit further comprises a leakage detection judging unit, wherein the leakage detection judging unit receives a current sampling signal representing the current flowing through the main power tube, and compares the current sampling signal with a first reference value to obtain a judgment result representing whether leakage exists.
When the current sampling signal is greater than the first reference value, the judgment result represents that no electric leakage phenomenon occurs, and according to the judgment result, the control of the electric leakage detection control unit on the main power tube is disconnected, and the control of the main power tube by the power conversion control unit is switched; and when the current sampling signal is smaller than the first reference value, the judgment result represents that the electric leakage phenomenon occurs, and the electric leakage detection control unit keeps controlling the main power tube according to the judgment result to continuously perform electric leakage detection.
Although the embodiments have been described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments not explicitly described, or to another embodiment described.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A switching power supply comprises a power stage circuit and a control circuit, wherein the control circuit is connected with a control end of the power stage circuit; the method is characterized in that:
the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power level circuit, and the leakage detection control unit controls a main power tube in the power level circuit to be conducted for the first time to realize leakage detection; the power conversion control unit controls the switching of a main power tube switch in the power level circuit to realize power conversion.
2. The switching power supply according to claim 1, characterized in that: the control circuit further comprises a leakage detection judging unit, wherein the leakage detection judging unit receives a current sampling signal representing the current flowing through the main power tube, and compares the current sampling signal with a first reference value to obtain a judgment result representing whether leakage exists.
3. The switching power supply according to claim 2, characterized in that: when the current sampling signal is greater than the first reference value, the judgment result represents that no electric leakage phenomenon occurs, and according to the judgment result, the control of the electric leakage detection control unit on the main power tube is disconnected, and the control of the main power tube by the power conversion control unit is switched; and when the current sampling signal is smaller than the first reference value, the judgment result represents that the electric leakage phenomenon occurs, and the electric leakage detection control unit keeps controlling the main power tube according to the judgment result to continuously perform electric leakage detection.
4. The switching power supply according to any one of claims 1 to 3, characterized in that: and after the switching power supply is electrified, delaying a second time or detecting that an input voltage value, a drain source voltage value of the main power tube or a load negative terminal voltage value reach a set threshold value, and controlling the main power tube to be conducted for a first time by the leakage detection control unit so as to realize leakage detection.
5. The switching power supply according to claim 4, wherein: the leakage detection judging unit comprises a voltage detection unit, the voltage detection unit detects the voltage of the power input end, the voltage of the drain source of the main power tube or the voltage of the negative end of the load to obtain a voltage detection signal, and when the voltage detection signal reaches a second reference value representing the set threshold value, the main power tube is controlled to be conducted for the first time.
6. The switching power supply according to claim 4, wherein: the voltage of the input end of the power supply is the voltage of two ends of the alternating current input after being rectified by the rectifier bridge or the voltage between one end of the rectifier bridge and one end of the alternating current input.
7. The switching power supply according to claim 2 or 3, characterized in that: the switching power supply further comprises a sampling resistor, one end of the sampling resistor is connected with the main power tube, and the other end of the sampling resistor is grounded.
8. A lighting driving circuit comprising:
the rectifier bridge receives an alternating current input power supply and rectifies the alternating current input;
the switching power supply comprises a power level circuit and a control circuit, wherein the control circuit is connected with the control end of the power level circuit;
the method is characterized in that: the control circuit comprises a leakage detection control unit and a power conversion control unit; the leakage detection control unit and the power conversion control unit are both connected with the control end of the power level circuit, and the leakage detection control unit controls a main power tube in the power level circuit to be conducted for the first time to realize leakage detection; the power conversion control unit controls the switching of a main power tube switch in the power level circuit to realize power conversion.
9. The lighting driving circuit according to claim 8, wherein: the control circuit further comprises a leakage detection judging unit, wherein the leakage detection judging unit receives a current sampling signal representing the current flowing through the main power tube, and compares the current sampling signal with a first reference value to obtain a judgment result representing whether leakage exists.
10. The lighting driving circuit according to claim 9, wherein: when the current sampling signal is greater than the first reference value, the judgment result represents that no electric leakage phenomenon occurs, and according to the judgment result, the control of the electric leakage detection control unit on the main power tube is disconnected, and the control of the main power tube by the power conversion control unit is switched; and when the current sampling signal is smaller than the first reference value, the judgment result represents that the electric leakage phenomenon occurs, and the electric leakage detection control unit keeps controlling the main power tube according to the judgment result to continuously perform electric leakage detection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911421882 | 2019-12-31 | ||
| CN2019114218828 | 2019-12-31 |
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| Publication Number | Publication Date |
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| CN211655982U true CN211655982U (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020205476.XU Active CN211655982U (en) | 2019-12-31 | 2020-02-25 | Switching power supply and lighting driving circuit |
| CN202010115225.7A Pending CN111181357A (en) | 2019-12-31 | 2020-02-25 | Switching power supply and lighting drive circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010115225.7A Pending CN111181357A (en) | 2019-12-31 | 2020-02-25 | Switching power supply and lighting drive circuit |
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| CN114364091B (en) * | 2021-12-21 | 2023-06-20 | 杭州士兰微电子股份有限公司 | LED drive control circuit, LED drive control method and LED drive system |
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- 2020-02-25 CN CN202020205476.XU patent/CN211655982U/en active Active
- 2020-02-25 CN CN202010115225.7A patent/CN111181357A/en active Pending
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| CN111181357A (en) | 2020-05-19 |
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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 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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