CN105162308A - Dummy load control circuit and flyback switching power supply circuit - Google Patents
Dummy load control circuit and flyback switching power supply circuit Download PDFInfo
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- CN105162308A CN105162308A CN201510454451.7A CN201510454451A CN105162308A CN 105162308 A CN105162308 A CN 105162308A CN 201510454451 A CN201510454451 A CN 201510454451A CN 105162308 A CN105162308 A CN 105162308A
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- diode
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- switching tube
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- control circuit
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- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Classifications
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
A dummy load control circuit is used between a first path output end and a second path output end of a flyback switching power supply circuit having two paths of outputs, and includes a first diode, a second diode, a first resistor, a second resistor, a dummy load device and a first switching tube; a positive electrode of the first diode is connected to a control end of the first switching tube through the first resistor, and a negative electrode of the first diode is connected to the first path output end; and a positive electrode of the second diode is connected with a low potential end of the first switching tube, a negative electrode of the second diode is connected with the control end of the first switching tube, the second resistor is connected to two ends of the second diode in parallel, and a high potential end of the first switching tube is connected to the first path output end through the dummy load device. Also disclosed is a flyback switching power supply circuit. The precision of auxiliary output voltage can be stabilized, and the standby power consumption is not affected.
Description
Technical field
The application relates to field of switch power, particularly relates to a kind of dummy load control circuit.
Background technology
The advantages such as topology is simple owing to having, input and output electrical isolation, lifting/voltage reducing scope are wide for inverse-excitation converting circuit, multiple-channel output load automatic equalization, and be widely used in the above out-put supply of two-way.
But in traditional doubleway output circuit of reversed excitation, main output (+12 volt) is that the load precision of closed-loop control is completely adjustable, and auxiliary output (+24 volt) is only half adjustment (controlling by means of only Transformer Winding).When main output for heavy duty and auxiliary output be underloading time, the voltage of auxiliary output wafts, and it is high to 35V to run, if stablize the voltage accuracy of auxiliary output, need increase dummy load in auxiliary output circuit, and when causing standby like this, power consumption increases.
Summary of the invention
Based on this, be necessary to provide a kind of voltage accuracy of the i.e. auxiliary output of Absorbable organic halogens but also do not affect dummy load control circuit and the inverse-excitation type switch power-supply circuit of stand-by power consumption.
A kind of dummy load control circuit, for be connected to have that two-way exports between the first via output of inverse-excitation type switch power-supply circuit and the second road output, comprise the first diode, the second diode, the first resistance, the second resistance, dummy load device and the first switching tube;
The positive pole of described first diode is connected to the control end of described first switching tube by described first resistance, the negative pole of described first diode receives described first via output; The positive pole of described second diode is connected with the cold end of described first switching tube, the negative pole of described second diode is connected with the control end of described first switching tube, described second resistor coupled in parallel is at the two ends of described second diode, and the hot end of described first switching tube is connected to described first via output by described dummy load device; The cold end of described first switching tube is also for connecting described second road output.
Wherein in an embodiment, described dummy load device is ohmic load.
Wherein in an embodiment, described first diode is voltage stabilizing didoe, and described second diode is switching diode.
Wherein in an embodiment, the model of described second diode is IN4148.
Wherein in an embodiment, described first switching tube is NPN type triode, the base stage of described NPN type triode is the control end of described first switching tube, the hot end of very described first switching tube of current collection of described NPN type triode, the cold end of very described first switching tube of transmitting of described NPN type triode.
A kind of inverse-excitation type switch power-supply circuit, comprising first via output, the second road output, transformer and first harmonic suppresses unit and second harmonic to suppress unit, and described first via output, the second road output suppress unit and second harmonic to suppress unit to be connected with described transformer respectively by described first harmonic; Also comprise:
Above-mentioned dummy load control circuit, described dummy load control circuit is connected between first via output and the second road output.
Wherein in an embodiment, described first harmonic suppresses unit and second harmonic to suppress unit to have same structure, includes a resistance, an electric capacity and two diodes, carries out parallel connection again after two diodes in parallels with the resistance of connecting, electric capacity.
Above-mentioned dummy load control circuit and inverse-excitation type switch power-supply circuit, when the second road output output for heavy duty and the output of first via output be underloading time, dummy load device serves as dummy load effect by the first switching tube between first via output and the second road output, thus improves the output voltage precision of first via output; In addition, when the output of the second road output be underloading or unloaded time (holding state), because the non-conducting of the first diode makes the first switching tube also not open-minded, now dummy load device is open-circuit condition idle, thus does not increase the stand-by power consumption of its circuit when standby.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of dummy load control circuit in an embodiment;
Fig. 2 is inverse-excitation type switch power-supply circuit schematic diagram in an embodiment.
Embodiment
Please refer to Fig. 1, is the schematic diagram of dummy load control circuit in an embodiment.
This dummy load control circuit for be connected to have that two-way exports between the first via output of inverse-excitation type switch power-supply circuit and the second road output, comprise the first diode D1, the second diode D2, the first resistance R1, the second resistance R2, dummy load device R 3 and the first switching tube Q1.
The positive pole of the first diode D1 is connected to the control end of the first switching tube Q1 by the first resistance R1, the negative pole of the first diode D1 receives described first via output.The positive pole of the second diode D2 is connected with the cold end of the first switching tube Q1, the negative pole of the second diode D2 is connected with the control end of the first switching tube Q1, second resistance R2 is connected in parallel on the two ends of the second diode D2, and the hot end of the first switching tube Q1 is connected to described first via output by dummy load device R 3; The cold end of the first switching tube Q1 is also for connecting described second road output.
In the present embodiment, dummy load device R 3 is ohmic load, is appreciated that in other embodiments, and described dummy load device can also be chosen as inductive load or capacitive load according to actual needs.First diode D1 is voltage stabilizing didoe, and the second diode D2 is switching diode, and model is IN4148.IN4148 is a kind of small-sized cache switching diodes, and on-off ratio is comparatively rapid, is widely used in the circuit that signal frequency is higher.
In the present embodiment, first switching tube Q1 is NPN type triode, the base stage of described NPN type triode is the control end of the first switching tube Q1, the hot end of the current collection of described NPN type triode very the first switching tube Q1, the cold end of the transmitting of described NPN type triode very the first switching tube Q1.Be appreciated that in other embodiments, the first switching tube Q1 can also be chosen as other intimate components and parts, as field effect transistor.
Please refer to Fig. 2, is inverse-excitation type switch power-supply circuit schematic diagram in an embodiment.
This inverse-excitation type switch power-supply circuit comprises first via output H1, the second road output H2, transformer T1 and first harmonic and suppresses unit 112 and second harmonic to suppress unit 114, and first via output H1, the second road output H2 suppress unit 112 and second harmonic to suppress unit 114 to be connected with transformer T1 respectively by first harmonic.This inverse-excitation type switch power-supply circuit also comprise embodiment illustrated in fig. 1 in dummy load control circuit 120, dummy load control circuit 120 is connected between first via output H1 and the second road output H2.The output voltage of first via output H1, the second road output H2 is respectively 24 volts, 12 volts, and the burning voltage of the first diode D1 is 15 volts.
In the present embodiment, first harmonic suppresses unit 112 and second harmonic to suppress unit 114 to have same structure, includes a resistance, an electric capacity and two diodes, carries out parallel connection again after two diodes in parallels with the resistance of connecting, electric capacity.
The operation principle of foregoing circuit is described referring to Fig. 2.
When the second road output H2 output for heavy duty and the output of first via output H1 be underloading time, first via output H1 voltage will higher than 24 volts, when the output of first via output H1 rises to 27.6 volts (volt+12 volt+0.6 volt=27.6 volt, voltage=15 between the base stage of voltage+the first switching tube Q1 of the first diode D1 both end voltage+first via output H1 and emitter), first switching tube Q1 is by conducting, dummy load device R 3 serves as dummy load effect by the first switching tube Q1 between first via output H1 and the second road output H2, the voltage of first via output H1 is made to be controlled in less than 27.6 volts, thus improve the output voltage precision of first via output H1.
When the output of the second road output H2 be underloading or unloaded time (holding state), first via output H1 controls its output voltage below 27 volts by transformer self winding, now because the non-conducting of the first diode D1 makes the first switching tube Q1 also not open-minded, the non-conducting of now dummy load device R 3 is open-circuit condition idle, thus does not increase the stand-by power consumption of its circuit when standby.
Above-mentioned dummy load control circuit and inverse-excitation type switch power-supply circuit, when the second road output output for heavy duty and the output of first via output be underloading time, dummy load device serves as dummy load effect by the first switching tube between first via output and the second road output, thus improves the output voltage precision of first via output; In addition, when the output of the second road output be underloading or unloaded time (holding state), because the non-conducting of the first diode makes the first switching tube also not open-minded, now dummy load device is open-circuit condition idle, thus does not increase the stand-by power consumption of its circuit when standby.
Claims (3)
1. a dummy load control circuit, for being connected to the first via with the inverse-excitation type switch power-supply circuit that two-way exports
Between output and the second road output, it is characterized in that, comprise the first diode, the second diode, the first resistance, the second resistance, dummy load device and the first switching tube; The positive pole of described first diode is connected to the control end of described first switching tube by described first resistance, the negative pole of described first diode receives described first via output; The positive pole of described second diode is connected with the cold end of described first switching tube, the negative pole of described second diode is connected with the control end of described first switching tube, described second resistor coupled in parallel is at the two ends of described second diode, and the hot end of described first switching tube is connected to described first via output by described dummy load device; The cold end of described first switching tube is also for connecting described second road output.
2. dummy load control circuit according to claim 1, is characterized in that, described dummy load device is ohmic load.
3. dummy load control circuit according to claim 1, is characterized in that, described first diode is voltage stabilizing didoe, and described second diode is switching diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510454451.7A CN105162308A (en) | 2015-07-30 | 2015-07-30 | Dummy load control circuit and flyback switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510454451.7A CN105162308A (en) | 2015-07-30 | 2015-07-30 | Dummy load control circuit and flyback switching power supply circuit |
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| CN105162308A true CN105162308A (en) | 2015-12-16 |
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| CN201510454451.7A Pending CN105162308A (en) | 2015-07-30 | 2015-07-30 | Dummy load control circuit and flyback switching power supply circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888065A (en) * | 2017-12-22 | 2018-04-06 | 佛山市顺德区美的电热电器制造有限公司 | A kind of dynamic clamp circuit |
| CN110417288A (en) * | 2019-08-06 | 2019-11-05 | 珠海格力电器股份有限公司 | Novel switching power supply driving circuit and control method thereof |
| CN113783434A (en) * | 2021-01-12 | 2021-12-10 | 青岛鼎信通讯股份有限公司 | Multi-output active dummy load applied to products in power industry |
| CN114649940A (en) * | 2020-12-18 | 2022-06-21 | 中芯国际集成电路制造（天津）有限公司 | A kind of leakage circuit and DC-DC converter |
| CN115227971A (en) * | 2022-07-28 | 2022-10-25 | 喻鹏铭 | Autonomic nerve electric stimulator |
-
2015
- 2015-07-30 CN CN201510454451.7A patent/CN105162308A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888065A (en) * | 2017-12-22 | 2018-04-06 | 佛山市顺德区美的电热电器制造有限公司 | A kind of dynamic clamp circuit |
| CN107888065B (en) * | 2017-12-22 | 2024-12-06 | 佛山市顺德区美的电热电器制造有限公司 | A dynamic clamping circuit |
| CN110417288A (en) * | 2019-08-06 | 2019-11-05 | 珠海格力电器股份有限公司 | Novel switching power supply driving circuit and control method thereof |
| CN114649940A (en) * | 2020-12-18 | 2022-06-21 | 中芯国际集成电路制造（天津）有限公司 | A kind of leakage circuit and DC-DC converter |
| CN113783434A (en) * | 2021-01-12 | 2021-12-10 | 青岛鼎信通讯股份有限公司 | Multi-output active dummy load applied to products in power industry |
| CN115227971A (en) * | 2022-07-28 | 2022-10-25 | 喻鹏铭 | Autonomic nerve electric stimulator |
| CN115227971B (en) * | 2022-07-28 | 2023-11-24 | 喻鹏铭 | Autonomic nerve electric stimulator |
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Application publication date: 20151216 |