CN201937488U - Ultralow-voltage-output adjusting power supply - Google Patents
Ultralow-voltage-output adjusting power supply Download PDFInfo
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- CN201937488U CN201937488U CN2011200003266U CN201120000326U CN201937488U CN 201937488 U CN201937488 U CN 201937488U CN 2011200003266 U CN2011200003266 U CN 2011200003266U CN 201120000326 U CN201120000326 U CN 201120000326U CN 201937488 U CN201937488 U CN 201937488U
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Abstract
The utility model relates to a voltage-adjusting power supply, comprising a rectifying and filtering circuit, a transformer circuit and a feedback circuit, wherein the feedback circuit comprises an integrated chip and an optical coupler; the bypass voltage input end and the feedback end of the integrated chip are connected with the sensing output end of the optical coupler; the output end of the integrated chip is respectively connected with the output end of a rectifying circuit and the negative end of a primary coil of a transformer; the positive electrode of an optical coupling input diode is connected with the positive output end of the transformer, and the negative electrode of the optical coupling input diode is connected with a voltage-stabilizing reference source; contacts of a toggle switch are respectively connected with a sampling resistor and the negative electrode of a diode; the other end of the sampling resistor is connected with the positive output end of the transformer by a voltage dividing resistor and simultaneously is connected with the voltage stabilizing end of the voltage-stabilizing reference source; and the positive electrode of the diode is connected with a first input end of the voltage-stabilizing reference source. In the voltage-adjusting power supply, the diode and the resistor for voltage division in the prior art are omitted, and the consumption of the diode and the resistor are saved; and in addition, a switch diode is connected between the three-end voltage-stabilizing reference source and the toggle switch so as to realize 1.5V ultralow voltage output, so that a product can meet the higher energy conservation standards in Europe and America.
Description
Technical field
The utility model relates to the DC power supply technical field, is specifically related to a kind of energy-efficient extra low voltage output regulated power supply.
Background technology
In the industry, design the input of high alternating voltage (for example AC100V ~ AC240V), ultralow output voltage (for example two kinds of voltages of 3V and 1.5V), output current is the adjustable power of direct current of 500mA, and require this power supply reach Europe and U.S.'s energy conservation standard be very the difficulty.
According to existing technology, designing such power supply has two kinds of methods: the one, adopt traditional low frequency linear power supply, but its volume ratio is bigger, and voltage accuracy and efficient are all on the low side; Another kind method is to adopt the high frequency switch power scheme of present comparative maturity, and this scheme relies on the adjustable shunting a reference source of one three end of output that feedback is provided, thereby can regulated output voltage.And have only two kinds according to the adjustable shunting a reference source of three ends commonly used on the present market, minimum benchmark output voltage is respectively 1.25V and 2.5V, shown in accompanying drawing one, if we are a reference source of 1.25V with minimum benchmark for the U3 among the figure, the minimum output voltage 1.25V that minimum output voltage equals a reference source U3 adds that U2 has the pressure drop about 1V, Shu Chu voltage is minimum so also has about 2.25V, the voltage of wanting to export 1.5V must seal in a diode D8 that the pressure drop of the 0.7V left and right sides is arranged at the positive terminal of circuit output, when output current is 500mA, the power of the last consumption of D8 is 0.5A*0.7V=0.35W, this is for low power power supply, the proportion of goods damageds are quite big, have a strong impact on efficient.
Summary of the invention
The utility model technical issues that need to address provide the power supply of a kind of efficient energy-saving, exportable extra low voltage.
According to the above-mentioned problem that needs solution, the technical scheme that the utility model is taked is: but a kind of voltage controller power source, comprise the current rectifying and wave filtering circuit that is connected with the input power supply, the transformer circuit that is connected with current rectifying and wave filtering circuit, be connected by feedback circuit between described transformer circuit input and the output, described feedback circuit one adopts toggle switch to realize the access of different sampling resistors and then regulates transformer circuit primary coil input signal duty ratio, realizes the output voltage adjusting.
Described feedback circuit comprises an integrated chip, an optocoupler, and this integrated chip bypass voltage input end and feedback end connect optocoupler induction output, and the integrated chip output connects rectification circuit output end and transformer negative terminal respectively; Optocoupler input diode cathode connecting transformer positive output end, optocoupler input diode negative pole connects voltage stabilizing a reference source, the toggle switch contact connects a sampling resistor and a diode cathode respectively, and the sampling resistor other end connects the transformer positive output end and connects voltage stabilizing a reference source voltage stabilizing end simultaneously by another divider resistance; And diode cathode connects voltage stabilizing a reference source first input end.
Compared with prior art, the beneficial effects of the utility model are: the utility model will be used for the diode D8 and resistance R 10 cancellations of dividing potential drop in the prior art, save consumption thereon, connecing a pressure drop in addition between three-terminal voltage-stabilizing a reference source and toggle switch is the switching diode realization 1.5V extra low voltage output of 0.5V, makes product can satisfy Europe and the higher energy conservation standard of the U.S..
Description of drawings
Fig. 1 is a general regulated power supply circuit theory schematic diagram in the prior art;
Fig. 2 is a power circuit principle schematic diagram described in the utility model.
Embodiment
Understanding for the ease of those skilled in the art is described in further detail the utility model below in conjunction with accompanying drawing:
As shown in Figure 1, but described voltage controller power source comprises current rectifying and wave filtering circuit, transformer circuit and feedback circuit.Described current rectifying and wave filtering circuit is connected with transformer circuit, be connected by feedback circuit between transformer circuit input and the output, described feedback circuit adopts toggle switch S1 to realize the access of different sampling resistors and then regulates transformer circuit primary coil input signal duty ratio, realizes the output voltage adjusting.
Described feedback circuit specifically comprises integrated chip U1, optocoupler U2, and integrated chip U1 bypass voltage input end and feedback end connect optocoupler U2 induction output, and integrated chip U1 output connects rectification circuit output end and transformer negative terminal respectively; Optocoupler U2 input diode cathode connecting transformer positive output end, U2 input diode negative input end connects voltage stabilizing a reference source U3, toggle switch S1 contact connects sampling resistor R9 and diode D9 negative pole respectively, and sampling resistor R9 other end end connects the transformer positive output end and connects voltage stabilizing a reference source voltage stabilizing end simultaneously by divider resistance R6; The anodal voltage stabilizing a reference source first input end that connects of diode D9.Described optocoupler U2 input diode is anodal to connect the transformer positive output end by current-limiting resistance R4, and negative pole connects the transformer positive output end by resistance R 8.
As shown in Figure 2,1 group of switch S is to contact A, diode D9 conducting over the ground, the sampling reference voltage of entire circuit output end voltage V+ is exactly the above earth potential of D9 positive terminal, is 0.5V, this moment circuit to export the voltage of load to be 1.5V.So just saved diode D8 and resistance R 10 in the available circuit shown in the accompanying drawing 1, when output current was 500mA, power output was that 1.5V*0.5A is 0.75W.And if adopt diode D8, the power of consumption is 0.5A*0.7V=0.35W it on, 0.35W/0.75 W * 100%=46.7%, obviously save diode D8 and resistance R 10 after, power-efficient significantly promotes.
Described integrated chip U1 model is LNK363, be a low-power consumption switch I C, integrated high-voltage power MOSFET, oscillator, ON/OFF control circuit, high-voltage switch gear current source, frequency jitter circuit, Cycle by Cycle current limliting and hot breaking circuit in it, power when startup and work is directly produced by the MOSFET drain lead, need not to use biasing winding and interlock circuit.
The a reference source of voltage stabilizing described in the embodiment adopts the adjustable shunting a reference source of three ends U3.
Described transformer output is connected with filter capacitor C5, C6, C10.Described transformer output negative terminal is connected with diode D7, and diode D7 negative pole connects transformer secondary winding, and diode D7 is the transformer negative output terminal just very.Described current rectifying and wave filtering circuit comprises the filter circuit that bridge rectifier that diode D1-D4 forms and inductance L 1, capacitor C 1, C2 form.But foregoing circuit all is the preferred versions that guarantee this voltage controller power source steady operation.
Above embodiment only is the preferable implementation of the utility model, can not limit the utility model with this, is not breaking away under the utility model design prerequisite, and its any being equal to of doing is replaced and minor variations all belongs to protection range of the present utility model.
Claims (7)
1. an extra low voltage is exported regulated power supply, comprise the current rectifying and wave filtering circuit that is connected with the input power supply, the transformer circuit that is connected with current rectifying and wave filtering circuit, be connected by feedback circuit between described transformer circuit input and the output, described feedback circuit adopts toggle switch S1 to realize the access of different sampling resistors and then regulates transformer circuit primary coil input signal duty ratio, realizes the output voltage adjusting; It is characterized in that:
Described feedback circuit comprises integrated chip U1, optocoupler U2, and integrated chip U1 bypass voltage input end and feedback end connect optocoupler U2 induction output, and integrated chip U1 output connects rectification circuit output end and transformer negative terminal respectively; Optocoupler U2 input diode cathode connecting transformer positive output end, U2 input diode negative pole connects voltage stabilizing a reference source U3, toggle switch S1 contact connects sampling resistor R9 and diode D9 negative pole respectively, and the sampling resistor R9 other end connects the transformer positive output end and connects voltage stabilizing a reference source voltage stabilizing end simultaneously by divider resistance R6; The anodal voltage stabilizing a reference source first input end that connects of diode D9.
2. extra low voltage output regulated power supply according to claim 1 is characterized in that: described optocoupler U2 input diode is anodal to connect the transformer positive output end by current-limiting resistance R4, and negative pole connects the transformer positive output end by resistance R 8.
3. extra low voltage output regulated power supply according to claim 2, it is characterized in that: described voltage stabilizing a reference source is the adjustable shunting a reference sources of three ends.
4. extra low voltage output regulated power supply according to claim 3, it is characterized in that: described integrated chip U1 model is LNK363.
5. extra low voltage output regulated power supply according to claim 4, it is characterized in that: described transformer output is connected with filter capacitor C5, C6, C10.
6. extra low voltage output regulated power supply according to claim 5 is characterized in that: described transformer output negative terminal is connected with diode D7, and diode D7 negative pole connects transformer secondary winding, and diode D7 is the transformer negative output terminal just very.
7. extra low voltage according to claim 6 output regulated power supply is characterized in that: described current rectifying and wave filtering circuit comprises the filter circuit that bridge rectifier that diode D1-D4 forms and inductance L 1, capacitor C 1, C2 form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200003266U CN201937488U (en) | 2011-01-04 | 2011-01-04 | Ultralow-voltage-output adjusting power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200003266U CN201937488U (en) | 2011-01-04 | 2011-01-04 | Ultralow-voltage-output adjusting power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937488U true CN201937488U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200003266U Expired - Fee Related CN201937488U (en) | 2011-01-04 | 2011-01-04 | Ultralow-voltage-output adjusting power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112235896A (en) * | 2020-09-10 | 2021-01-15 | 深圳市崧盛电子股份有限公司 | Circuit for automatically adjusting output current by low-voltage input and driving power supply |
-
2011
- 2011-01-04 CN CN2011200003266U patent/CN201937488U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112235896A (en) * | 2020-09-10 | 2021-01-15 | 深圳市崧盛电子股份有限公司 | Circuit for automatically adjusting output current by low-voltage input and driving power supply |
| CN112235896B (en) * | 2020-09-10 | 2023-04-18 | 深圳市崧盛电子股份有限公司 | Circuit for automatically adjusting output current by low-voltage input and driving power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20200104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |