CN114189144A - Control method and control circuit of silicon controlled switch circuit - Google Patents
Control method and control circuit of silicon controlled switch circuit Download PDFInfo
- Publication number
- CN114189144A CN114189144A CN202110997189.6A CN202110997189A CN114189144A CN 114189144 A CN114189144 A CN 114189144A CN 202110997189 A CN202110997189 A CN 202110997189A CN 114189144 A CN114189144 A CN 114189144A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 12
- 239000010703 silicon Substances 0.000 title claims abstract description 12
- 230000001939 inductive effect Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000005070 sampling Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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Classifications
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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
- 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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a control method and a control circuit of a silicon controlled switch circuit, wherein the switch circuit comprises a main power tube and an inductor, a peak current reference signal of the inductor is obtained according to a first reference voltage and the duty ratio of the main power tube, and the current of the inductor is controlled according to the peak current reference signal, so that the input current of the switch circuit is kept stable. The invention can not only ensure the requirement of the silicon controlled dimmer on the holding current, but also meet the application requirement of medium and small power.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a control method and a control circuit of a silicon controlled switch circuit.
Background
In the silicon controlled rectifier dimming application, under the condition that PF is required to be larger than 0.9, the input current waveform is sine wave under the control of constant on-time, the middle is large, and two sides are small, so that the requirement of a TRIAC dimmer on the holding current is difficult to meet. In order to increase the input current at two sides, peak current control is often adopted, and the method can obviously increase the input current at two sides of a sine wave, but the middle input current is often smaller, so that the application under medium and small power is limited.
Disclosure of Invention
The invention aims to provide a control method and a control circuit of a silicon controlled switch circuit with wide application range, and solves the problem that the prior art can not simultaneously meet the requirement of a silicon controlled dimmer on the holding current and the medium and low power application.
In view of the above, the present invention provides a method for controlling a thyristor switching circuit, the switching circuit comprising a main power transistor and an inductor,
obtaining a peak current reference signal of the inductor according to the first reference voltage and the duty ratio of the main power tube; and controlling the inductive current according to the peak current reference signal so that the input current of the switching circuit is kept stable.
Optionally, a valley current reference signal of the inductor is obtained according to the second reference voltage and the duty ratio of the main power tube;
and controlling the inductive current according to the peak current reference signal and the valley current reference signal, so that the input current of the switch circuit is kept stable.
Optionally, the switching circuit operates in an intermittent conduction mode or a critical conduction mode, and the peak current reference signal becomes smaller as the duty ratio signal becomes larger.
Optionally, the peak current reference signal is inversely proportional to the duty cycle.
Optionally, the switching circuit operates in a continuous conduction mode, and a sum of the peak current reference signal and the valley current reference signal becomes smaller as the duty ratio becomes larger.
Optionally, the sum of the peak current reference signal and the valley current reference signal is inversely proportional to the duty ratio.
Optionally, the switching circuit includes an input filter and a voltage dropping circuit or a voltage raising and lowering circuit.
The invention also provides a control circuit of the silicon controlled switch circuit, the switch circuit comprises a main power tube and an inductor, and the control circuit comprises:
the parameter acquisition circuit is used for acquiring a first signal representing the duty ratio information of the main power tube;
the peak control circuit receives the first signal and a first reference voltage and outputs a peak current reference signal according to the first signal and the first reference voltage; the peak current reference signal is used for controlling the current of the inductor, so that the input current of the switch circuit is kept stable.
Optionally, the switching circuit further includes a valley control circuit, which receives the first signal and the second reference voltage, and outputs a valley current reference signal according to the first signal and the second reference voltage, where the valley current reference signal is used to control the input current of the switching circuit.
Optionally, the peak control circuit includes a first divider, and the first divider receives a first reference voltage and the first signal and divides the first reference voltage and the first signal to obtain the peak current reference signal.
Optionally, the peak control circuit includes a first divider, and the valley control circuit includes a second divider, where the first divider receives a first reference voltage and the first signal, divides the first reference voltage and the first signal, and outputs the peak current reference signal; the second divider receives a second reference voltage and the first signal, divides the second reference voltage and the first signal, and outputs the valley current reference signal.
Compared with the prior art, the invention has the following advantages: and obtaining a peak current reference signal of the inductor according to the first reference voltage and the duty ratio of the main power tube, wherein the peak current reference signal controls the current of the inductor, so that the input current of the switching circuit is kept stable. The invention can give consideration to the application of the maintaining current and medium and low power of the silicon controlled dimmer.
Drawings
FIG. 1 is a block diagram of an embodiment of the input current control of the switching circuit of the present invention;
FIG. 2 is a diagram of a control circuit according to a first embodiment of the present invention;
FIG. 3 is a block diagram of a second embodiment of the input current control of the switching circuit of the present invention.
Detailed Description
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 invention is intended to cover any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the 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 in simplified form and are not to precise scale for the purpose of facilitating and clearly explaining the embodiments of the present invention.
As shown in fig. 1, a block diagram of an embodiment of the present invention for controlling the input current of the switching circuit is shown, an ac input power is input to the switching circuit U01 through a thyristor and a rectifying circuit U00, the switching circuit includes an input filter and a voltage dropping circuit or a voltage dropping circuit, etc., here, the voltage dropping circuit is taken as an example, and the input current of the switching circuit is used as the holding current during the operation of the thyristor. According to the operating principle of the step-down circuit, and assuming that the step-down circuit operates in a critical conduction mode or an interrupted conduction mode as an example, the requirement that the input current Iin is 0.5 Ipk duration (VREF1/Rs) duration is satisfied, wherein Ipk VREF1/Rs is a peak inductor current, VREF1 is an inductor peak current reference signal, Rs is an equivalent resistance, and duration is a main power tube duty ratio is satisfied. Referring to fig. 1, a specific circuit structure of an embodiment of the present invention includes a control circuit including a parameter obtaining circuit U02, a peak value control circuit U03, and a first control circuit U04, where the parameter obtaining circuit U03 obtains a first signal duty representing a duty ratio of a main power transistor of a switching circuit, and the peak value control circuit U03 receives the first signal duty and obtains a peak value current reference signal VREF1 according to the first signal duty and the first reference signal, so that the peak value current reference signal VREF1 is inversely proportional to the first signal duty.
According to the above circuit principle, the peak current reference signal VREF1 is controlled to be inversely proportional to the duty, if VREF1/duty is k, and k is a constant, a stable value of the input current Iin is obtained, and the input current Iin does not have a large middle part and a small two ends in a half-wave period, so that the requirement of the TRIAC dimmer on the minimum holding current can be met, and the application of the TRIAC dimmer on the small power can be ensured. The stable value here is a value where the input current of the switching circuit is kept substantially stable, i.e. a value of a suitable magnitude, or a value varying over a small range, under the present operating conditions, e.g. where the input voltage and the output power are predetermined, as known to those skilled in the art, the output current may change under different output power conditions, but the input current remains stable during the present operating period.
As shown in fig. 2, which illustrates a block diagram of a first embodiment of the present invention, the schematic diagram is further detailed on the basis of the block diagram shown in fig. 1, the structure diagram switch circuit still takes a voltage reduction circuit as an example, an alternating current input power supply transmits silicon controlled rectifier and rectified current to the input end of the switch circuit, the switch circuit comprises an input filter and a voltage reduction circuit, the voltage reduction circuit comprises a parameter acquisition circuit U02, a divider U03, a first operational amplifier U401 and a drive control circuit U402, wherein the parameter acquisition circuit U02 receives a current sampling signal of a main power tube M0 and outputs a duty ratio signal duty of the main power tube, the parameter acquisition circuit U02 can also obtain a duty ratio signal of the main power tube M0 by sampling input voltage and output voltage, the peak control circuit according to the embodiment of the present invention is implemented by a divider, but is not limited thereto, and circuits having the same function may be applied thereto. The divider U03 receives the first reference voltage VREF and the duty cycle, and divides the first reference voltage VREF and the duty cycle by the output peak current reference signal VREF1, where the first reference voltage VREF is the desired output peak current. The first operational amplifier U401 receives the peak current reference signal VREF1 and the main power transistor current sampling signal VCS, amplifies the error, and outputs a peak control signal VC 1. The driving control circuit U402 receives the peak control signal VC1 and outputs a driving signal to drive the main power transistor M0.
As shown in fig. 3, a second block diagram of the input current control embodiment of the switching circuit of the present invention is illustrated, and the difference from the first embodiment is that the switching circuit operates in the continuous conduction mode, and the input current Iin is 0.5 Ipk duty is 0.5 ((VREF1+ VREF2)/Rs) duty, and VREF1 and VREF2 are the peak current reference signal and the valley current reference signal, respectively. Referring to fig. 2, a specific circuit structure includes a parameter obtaining circuit U02, a peak control circuit U03, a valley control circuit U05, and a first control circuit U04, where the parameter obtaining circuit U03 obtains a first signal duty representing a duty ratio of a main power transistor of the switching circuit, and the peak control circuit U03 and the valley control circuit U05 respectively receive the first signal duty and obtain a peak current reference signal VREF1 and a valley current reference signal VREF2 according to the first signal duty, so that a sum of the peak current reference signal VREF1 and the valley current reference signal VREF2 is inversely proportional to the first signal duty.
It is understood that the valley control circuit may also be implemented by a divider, for example, the valley control circuit includes a second divider, the first divider receives a first reference voltage and the first signal, divides the first reference voltage and the first signal, and outputs the peak current reference signal; the second divider receives a second reference voltage and the first signal, divides the second reference voltage and the first signal, and outputs the valley current reference signal. Which is similar in principle to that in figure 3.
If the sum of the peak current reference signal VREF1 and the valley current reference signal VREF2 is proportional to duty, (VREF1+ VREF2)/duty ═ k, k is a constant, the input current Iin is a stable value, and here, the input current is a substantially constant value, and the input current Iin is not large in the middle and small in the two ends, so that the requirement of the TRIAC dimmer on the minimum holding current can be met, and the application of low power in the TRIAC dimmer can be guaranteed.
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 (11)
1. A control method of a silicon controlled switch circuit, the switch circuit comprises a main power tube and an inductor, and is characterized in that:
obtaining a peak current reference signal of the inductor according to the first reference voltage and the duty ratio of the main power tube;
and controlling the inductive current according to the peak current reference signal so that the input current of the switching circuit is kept stable.
2. The method of controlling a thyristor switching circuit according to claim 1, wherein: obtaining a valley current reference signal of the inductor according to the second reference voltage and the duty ratio of the main power tube;
and controlling the inductive current according to the peak current reference signal and the valley current reference signal, so that the input current of the switch circuit is kept stable.
3. The method of controlling a thyristor switching circuit according to claim 1, wherein: the switching circuit works in an intermittent conduction mode or a critical conduction mode, and the peak current reference signal becomes smaller as the duty ratio signal becomes larger.
4. The method of controlling a thyristor switching circuit according to claim 3, wherein: the peak current reference signal is inversely proportional to the duty cycle.
5. The method of controlling a thyristor switching circuit according to claim 2, wherein: the switching circuit operates in a continuous conduction mode, and the sum of the peak current reference signal and the valley current reference signal becomes smaller as the duty ratio becomes larger.
6. The method of controlling a thyristor switching circuit according to claim 5, wherein: the sum of the peak current reference signal and the valley current reference signal is inversely proportional to the duty cycle.
7. The method of controlling a thyristor switching circuit according to claim 1, wherein: the switching circuit comprises an input filter and a voltage reduction circuit or a voltage increase and decrease circuit.
8. A control circuit for a thyristor switching circuit, the switching circuit including a main power transistor and an inductor, comprising:
the parameter acquisition circuit is used for acquiring a first signal representing the duty ratio information of the main power tube;
the peak control circuit receives the first signal and a first reference voltage and outputs a peak current reference signal according to the first signal and the first reference voltage; the peak current reference signal is used for controlling the current of the inductor, so that the input current of the switch circuit is kept stable.
9. The control circuit of a thyristor switch circuit according to claim 8, wherein: the valley control circuit is used for receiving the first signal and the second reference voltage and outputting a valley current reference signal according to the first signal and the second reference voltage, wherein the valley current reference signal is used for controlling the input current of the switch circuit.
10. The control circuit of a thyristor switch circuit according to claim 8, wherein: the peak control circuit comprises a first divider, wherein the first divider receives a first reference voltage and the first signal and divides the first reference voltage and the first signal to obtain the peak current reference signal.
11. The control circuit of a thyristor switch circuit according to claim 9, wherein: the peak control circuit comprises a first divider, the valley control circuit comprises a second divider, and the first divider receives a first reference voltage and the first signal, divides the first reference voltage and the first signal and outputs a peak current reference signal; the second divider receives a second reference voltage and the first signal, divides the second reference voltage and the first signal, and outputs the valley current reference signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997189.6A CN114189144B (en) | 2021-08-27 | 2021-08-27 | Control method and control circuit of silicon controlled switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997189.6A CN114189144B (en) | 2021-08-27 | 2021-08-27 | Control method and control circuit of silicon controlled switch circuit |
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| CN114189144A true CN114189144A (en) | 2022-03-15 |
| CN114189144B CN114189144B (en) | 2024-01-23 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09140145A (en) * | 1995-11-15 | 1997-05-27 | Samsung Electron Co Ltd | Boosting converter provided with power-factor compensating circuit |
| CN102202449A (en) * | 2011-06-30 | 2011-09-28 | 杭州士兰微电子股份有限公司 | LED driving control circuit and method |
| CN105792436A (en) * | 2016-04-21 | 2016-07-20 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply controller and switching power supply |
| CN105827123A (en) * | 2016-05-20 | 2016-08-03 | 杰华特微电子（杭州）有限公司 | Power conversion circuit and drive control circuit thereof |
| CN107454708A (en) * | 2017-05-26 | 2017-12-08 | 厦门奇力微电子有限公司 | A kind of high PF, the LED driver circuit of controllable silicon light modulation |
| CN111464026A (en) * | 2020-05-22 | 2020-07-28 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and switching converter using same |
-
2021
- 2021-08-27 CN CN202110997189.6A patent/CN114189144B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09140145A (en) * | 1995-11-15 | 1997-05-27 | Samsung Electron Co Ltd | Boosting converter provided with power-factor compensating circuit |
| CN102202449A (en) * | 2011-06-30 | 2011-09-28 | 杭州士兰微电子股份有限公司 | LED driving control circuit and method |
| CN105792436A (en) * | 2016-04-21 | 2016-07-20 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply controller and switching power supply |
| CN105827123A (en) * | 2016-05-20 | 2016-08-03 | 杰华特微电子（杭州）有限公司 | Power conversion circuit and drive control circuit thereof |
| CN107454708A (en) * | 2017-05-26 | 2017-12-08 | 厦门奇力微电子有限公司 | A kind of high PF, the LED driver circuit of controllable silicon light modulation |
| CN111464026A (en) * | 2020-05-22 | 2020-07-28 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and switching converter using same |
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| Publication number | Publication date |
|---|---|
| CN114189144B (en) | 2024-01-23 |
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