CN201663557U - Secondary side power supply control switch - Google Patents
Secondary side power supply control switch Download PDFInfo
- Publication number
- CN201663557U CN201663557U CN2010201129869U CN201020112986U CN201663557U CN 201663557 U CN201663557 U CN 201663557U CN 2010201129869 U CN2010201129869 U CN 2010201129869U CN 201020112986 U CN201020112986 U CN 201020112986U CN 201663557 U CN201663557 U CN 201663557U
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- power supply
- switching device
- switch
- secondary side
- oxide semiconductor
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Abstract
The utility model discloses a secondary side power supply control switch. A first metal-oxide semiconductor field-effect transistor is connected on a main switch of a switching power supply control circuit for controlling the switching on-off action of the main switch; and a first photocoupler is isolated from a switching device, therefore the switching device can be arranged at the secondary side. Meanwhile, an auxiliary power supply is provided to start the first photocoupler. The switching device can be a solid switch, also can be a microcontroller with low power consumption or an electronic switch controlled by a control circuit. Therefore, when the power supply is switched off by the switching device, the overall electric energy consumption can reach to milliwatt level, and the switch with low price, low current and free of safety requirement can be adopted.
Description
Technical field
The utility model refers to a kind of power control switch that switching device is arranged on Switching Power Supply supply (SMPS) control circuit secondary side especially about a kind of power control switch.
Background technology
Switching Power Supply supply (Switch-Mode Power Supply, be called for short SMPS) technology, make the standby consumed power of electronic product greatly to descend, be applied to widely at present in the fields such as charger, LCD, power supply adaptor, system power supply supply, AC power transducer.
In Fig. 1, shown known Switching Power Supply supply (SMPS) control circuit figure, mainly on the input supply terminal that connects 100～240V alternating current, be provided with an entity switch 900, closed with the control electric power starting.Alternating current input is after rectifier 901 and filter capacitor 902 produce an input voltage vin offering a transformer 904 first siding rings, and is being connected to Switching Power Supply supply (SMPS) controller 903 with control main switch 905.
When current source Icc surpasses the starting current of Switching Power Supply provisioning controller 903, Switching Power Supply provisioning controller 903 output switching pulses are given main switch 905, make the action of transformer 904 first siding rings, make second siding ring produce induced voltage, produce output voltage V out through a rectifier 906 and a filter capacitor 907.Output voltage V out feedbacks to Switching Power Supply provisioning controller 903, and Switching Power Supply provisioning controller 903 makes that according to the duty ratio (PWM pattern) or the switching frequency (PFM pattern) of feedback signal adjusting main switch 905 output voltage V out is a stable voltage.
In the general SMPS control circuit of this kind; the entity switch 900 of control mains switch is to be set at primary side; have big electric current and big power consumption; when entity switch 900 is opened, have great immediate current, this will make entity switch 900 on selecting for use; safety standard must will be met; and do protections such as backguy and insulation possibly, and cost will be improved, remain to be improved.
Summary of the invention
Edge this, the purpose of this utility model is, a kind of secondary side power control switch is provided, it can overcome the defective in the existing power supply control switch, make its total consumption electric energy can reach the milliwatt level, and can adopt the low price low current and exempt the switch of safety demand, thereby simplified structure and saving cost.
For achieving the above object, the utility model discloses a kind of secondary side power control switch, be installed in the Switching Power Supply supply control circuit, this control circuit has an input supply terminal, produces an input voltage and starting current source through a rectifier and one first filter capacitor; One transformer has first siding ring and second siding ring; This first siding ring connects this input voltage; This second siding ring induced voltage produces an output voltage through a rectification feedback loop and one second filter capacitor; One main switch is connected in conducting and the cut-out of first siding ring to control this first siding ring of this transformer; Thereby a Switching Power Supply provisioning controller is controlled this main switch is controlled this main switch according to the feedback signal of this rectification feedback loop Push And Release; It is characterized in that comprising:
One first metal oxide semiconductor field effect electric crystal is connected on this main switch and the control switch action;
One switching device is arranged at the secondary side that this Switching Power Supply is supplied control circuit;
One first optical coupler is isolated this switching device in secondary side; And
One accessory power supply starts this first optical coupler;
When this switching device disconnected, this first optical coupler was failure to actuate, and makes this first metal oxide semiconductor field effect electric crystal conducting, and this main switch is closed, with the power that reduces electric consumption to the milliwatt level; When this switching device was closed, this optical coupler cut off this first metal oxide semiconductor field effect electric crystal, and this output voltage is greater than this accessory power supply, and then output voltage replaces this accessory power supply voltage and continues to close this first metal oxide semiconductor field effect electric crystal.
Wherein, this switching device is an entity switch.
Wherein, this switching device further connects one second metal oxide semiconductor field effect electric crystal, and isolates with one second optical coupler; Do not connect input orthogonal stream power supply and this switching device when still closed at this input supply terminal, this not start of second optical coupler disconnects this second metal oxide semiconductor field effect electric crystal.
Wherein, this switching device is an electronic switch of being controlled with the microcontroller or a control circuit of a low power consumption.
By said structure, when this switching device during, this main switch is closed at powered-down, make the total consumption electric energy can reach the milliwatt level; And this switch can adopt the low price low current and exempt the switch of safety demand, thus simplified structure and saving cost; This switching device is further used one second metal oxide semiconductor field effect electric crystal, and isolate with one second optical coupler, thereby switching device is not still when closed (close) when there being the input power supply, the second not start of optical coupler, the second metal oxide semiconductor field effect electric crystal is turn-offed, to prevent that accessory power supply from discharging to switching device, further reduce power consumption.
Below, design feature of the present utility model will be described in detail according to the embodiment shown in the drawing and use effect.
Description of drawings
Fig. 1 represents the basic circuit diagram of known SMPS,
Fig. 2 represents circuit diagram of the present utility model,
Fig. 3 represents the circuit diagram of the another kind of embodiment of the utility model,
Fig. 4 represents the circuit diagram of another embodiment of the utility model.
Embodiment
See also shown in Figure 2, the utility model provides a kind of secondary side power control switch, mainly in Switching Power Supply supply (SMPS) control circuit 10, one first metal oxide semiconductor field effect electric crystal 20, a switching device 30, one first optical coupler 401 and 402 and one accessory power supply 50 are set.
Switching Power Supply supply control circuit 10 has an input supply terminal 11 to connect an AC power, and for example AC 100～240V produces an input voltage vin and starting current source Icc through the rectifier 12 and first filter capacitor 13.Transformer 14 has first siding ring 141 and second siding ring 142.First siding ring 141 connects input voltage, and second siding ring 142 induced voltages are through a rectification and feedback loop 15 and second filter capacitor, 16 generations, one output voltage V out.Main switch 17 is connected in the first siding ring 141 of this transformer 14, with the conducting and the cut-out of control first siding ring 141.Switching Power Supply supply (SMPS) controller 18 is controlled main switches 17, controls the switch of main switch 17 according to the feedback signal of rectification and feedback loop 15.
And secondary side power control switch provided by the utility model mainly is connected in the first metal oxide semiconductor field effect electric crystal (MOSFET) 20 on the main switch 17, and the switch motion of control main switch 17.And switching device 30 is arranged at the secondary side of transformer 14.First optical coupler 401 and 402 is made of first light emitting source and light-receiving device, in order to isolate this switch in secondary side.Accessory power supply 50 for example is a battery in order to start first optical coupler 401 and 402, and so that a cell voltage Vcell to be provided, this cell voltage Vcell adds the forward voltage Vd of first optical coupler 401 and 402 greater than 0.7V.
When the utility model disconnected (open) at switching device 30, first optical coupler 401 and 402 was failure to actuate, and makes 20 conductings of the first metal oxide semiconductor field effect electric crystal, and main switch 17 is closed, with the power that reduces electric consumption to the milliwatt level.For example: current source Icc=30 μ A, input voltage vin=110 * 1.414=154V, consumed power=0.03 * 154=4.6mw then is so can be described as the milliwatt level.
The utility model is when switching device 30 closures (close), provide electric power the first metal oxide semiconductor field effect electric crystal 20 to be closed by accessory power supply 50 to first optical coupler 401 and 402, main switch 17 moves and generation transmission of electricity pressure Vout, if output voltage V out is greater than the voltage Vcell of accessory power supply, then output voltage V out replacement accessory power supply voltage continues to close the first metal oxide semiconductor field effect electric crystal 20, makes main switch 17 according to feedback signal control Push And Release.
Because switching device 30 of the present utility model can be an entity switch, be set at Switching Power Supply supply control circuit 10 secondary sides with the unlatching of control power supply and close.When switching device 30 during at powered-down, the total consumption electric energy can reach the milliwatt level, and switching device 30 can adopt low price, low current and exempt the switch of safety demand, and can significantly reduce cost.
Referring to another kind of embodiment of the present utility model shown in Figure 3, when switching device 30 is the entity switch, the situation that consumes accessory power supply 50 in order to prevent input supply terminal 11 AC-less power and switching device 30 still closed (close), further connect one second metal oxide semiconductor field effect electric crystal 31 at switching device 30, and isolate with one second optical coupler 321 and 322 that constitutes by second luminous element and second light-receiving device.
When input supply terminal 11 does not connect input power supply and switching device 30 still when closed (close), second optical coupler 321 and 322 not starts, the second metal oxide semiconductor field effect electric crystal 31 is turn-offed, disconnect (open), prevent that accessory power supply 50 from consuming to be equivalent to switching device 30.
In addition, see also an embodiment more of the present utility model shown in Figure 4, wherein the also electronic switch controlled of a microcontroller (MCU) or a control circuit 61 of switching device 60 with a low power consumption.
To sum up institute is old, and a kind of secondary side power control switch provided by the utility model can reach the effect of low consumpting power when closing really, meets patent requirement fully, files an application in the whence in accordance with the law.
Claims (4)
1. a secondary side power control switch is installed in the Switching Power Supply supply control circuit, and this control circuit has an input supply terminal, produces an input voltage and starting current source through a rectifier and one first filter capacitor; One transformer has first siding ring and second siding ring; This first siding ring connects this input voltage; This second siding ring induced voltage produces an output voltage through a rectification feedback loop and one second filter capacitor; One main switch is connected in conducting and the cut-out of first siding ring to control this first siding ring of this transformer; Thereby a Switching Power Supply provisioning controller is controlled this main switch is controlled this main switch according to the feedback signal of this rectification feedback loop Push And Release; It is characterized in that comprising:
One first metal oxide semiconductor field effect electric crystal is connected on this main switch and the control switch action;
One switching device is arranged at the secondary side that this Switching Power Supply is supplied control circuit;
One first optical coupler is isolated this switching device in secondary side; And
One accessory power supply starts this first optical coupler;
When this switching device disconnected, this first optical coupler was failure to actuate, and makes this first metal oxide semiconductor field effect electric crystal conducting, and this main switch is closed, with the power that reduces electric consumption to the milliwatt level; When this switching device was closed, this optical coupler cut off this first metal oxide semiconductor field effect electric crystal, and this output voltage is greater than this accessory power supply, and then output voltage replaces this accessory power supply voltage and continues to close this first metal oxide semiconductor field effect electric crystal.
2. according to the described secondary side power control switch of claim 1, it is characterized in that this switching device is an entity switch.
3. according to the described secondary side power control switch of claim 2, it is characterized in that this switching device further connects one second metal oxide semiconductor field effect electric crystal, and isolate with one second optical coupler; Do not connect input orthogonal stream power supply and this switching device when still closed at this input supply terminal, this not start of second optical coupler disconnects this second metal oxide semiconductor field effect electric crystal.
4. according to the described secondary side power control switch of claim 1, it is characterized in that this switching device is an electronic switch of being controlled with the microcontroller or a control circuit of a low power consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201129869U CN201663557U (en) | 2010-02-12 | 2010-02-12 | Secondary side power supply control switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201129869U CN201663557U (en) | 2010-02-12 | 2010-02-12 | Secondary side power supply control switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201663557U true CN201663557U (en) | 2010-12-01 |
Family
ID=43233974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201129869U Expired - Fee Related CN201663557U (en) | 2010-02-12 | 2010-02-12 | Secondary side power supply control switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201663557U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324853A (en) * | 2011-09-23 | 2012-01-18 | 广州金升阳科技有限公司 | A kind of auxiliary power supply method and auxiliary power circuit of DC-DC supply convertor |
-
2010
- 2010-02-12 CN CN2010201129869U patent/CN201663557U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324853A (en) * | 2011-09-23 | 2012-01-18 | 广州金升阳科技有限公司 | A kind of auxiliary power supply method and auxiliary power circuit of DC-DC supply convertor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20130212 |