CN205178884U - False load circuit of output adjustable adjustable power - Google Patents
False load circuit of output adjustable adjustable power Download PDFInfo
- Publication number
- CN205178884U CN205178884U CN201521039163.7U CN201521039163U CN205178884U CN 205178884 U CN205178884 U CN 205178884U CN 201521039163 U CN201521039163 U CN 201521039163U CN 205178884 U CN205178884 U CN 205178884U
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- China
- Prior art keywords
- circuit
- power supply
- resistance
- adjustable
- regulated power
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Abstract
The utility model provides a false load circuit of output adjustable adjustable power, include the comparison circuit and the switch circuit that are connected with adjustable power output positive pole, when comparison circuit discovery adjustable power output voltage was higher than the setting value, switch circuit turn -offed, and when comparison circuit discovery adjustable power output voltage was less than the setting value, switch circuit switched on. False load circuit of output adjustable adjustable power, through increase comparison circuit and switch circuit in the adjustable power circuit, and when comparison circuit discovery adjustable power output voltage is higher than the setting value, switch circuit turn -offs, when comparison circuit discovery adjustable power output voltage is less than the setting value, the mode that switch circuit switched on, make false load circuit changeable between adjustable power output voltage's high low value, the efficiency of adjustable power's work is improved, simple structure of the circuit, therefore, the carrier wave prepaid electric energy meter is low in cost.
Description
Technical field
The utility model relates to regulated power supply technical field, particularly relates to a kind ofly to export adjustable regulated power supply dummy load circuit.
Background technology
In the development process of regulated power supply, when electric power output voltage is lower, during output no-load, now duty ratio is very little, power work is in on-off state, make the unloaded ripple of power supply comparatively large, and output voltage is easily unstable, in this case, usually by adding dummy load circuit at output, increase duty ratio, power supply is exported continuously, thus reduces output ripple amplitude, make output voltage stabilization simultaneously, but existing dummy load circuit, usually still for directly to increase resistance as load at power output end, circuit structure is relatively simple.
Prior art is too single, when electric power output voltage is higher, requires very high to the power requirements of dummy load own, and dummy load needs to use power large, and bulky load, the space taking power supply is larger.
For the power supply that output voltage is adjustable, when practical application, when some specific voltages do not need dummy load circuit to work, existing technology lacks control circuit, and dummy load circuit can be always in running order, increases the loss of power supply, affects the efficiency of power supply.
Such as, it is 0 ~ 250Vdc that power supply exports adjustable extent, when exporting 10V, and in addition 0.1A dummy load, according to rating formula W=UI, the power consumption of now dummy load is 1W, and when exporting rise 250V, dummy load power consumption is now 25W, obviously when output voltage height, dummy load power consumption is much larger, needs the volume that takies much larger in the supply, and very large on the impact of efficiency.
Utility model content
For this reason, technical problem to be solved in the utility model is: provide a kind of and export adjustable regulated power supply dummy load circuit, and to improve the operating efficiency of regulated power supply, circuit structure is simple, with low cost.
So, the utility model provides and a kind ofly exports adjustable regulated power supply dummy load circuit, comprise the comparison circuit and switching circuit that are connected with regulated power supply output cathode, when comparison circuit finds regulated power supply output voltage higher than set point, switching circuit turns off, when comparison circuit finds regulated power supply output voltage lower than set point, switching circuit conducting.
Wherein, described comparison circuit comprises: resistance R39, R46, R888 of connecting successively, after series connection, one end of resistance R39 is connected with the output positive input terminal of adjustable voltage, after series connection, one end of resistance R888 is by electric capacity C31 ground connection, other one end of electric capacity C31 is connected with the inverting input of comparator N4, electric capacity C31 is also parallel with resistance R64, the in-phase input end of comparator N4 is connected with reference voltage by resistance R60, the in-phase input end of comparator N4 is also connected with the output of comparator N4 by resistance R51, and the output of comparator N4 is connected with switching circuit.
Described reference voltage is 2.5V.
Wherein, described switching circuit comprises: the grid of NMOS tube Q7 is connected with described comparison circuit, and the drain electrode of NMOS tube Q7 is connected with the output cathode of regulated power supply by resistance R43, the source ground of NMOS tube Q7, and the grid of NMOS tube Q7 is also by resistance R65 ground connection.
The regulated power supply dummy load circuit that output described in the utility model is adjustable, by increasing comparison circuit and switching circuit in adjustable power circuit, and when comparison circuit finds regulated power supply output voltage higher than set point, switching circuit turns off, when comparison circuit finds regulated power supply output voltage lower than set point, the mode of switching circuit conducting, make dummy load circuit changeable between the high low value of regulated power supply output voltage, improve the operating efficiency of regulated power supply, circuit structure is simple, with low cost.
Accompanying drawing explanation
Fig. 1 is for exporting adjustable regulated power supply dummy load circuit figure described in the utility model embodiment.
Embodiment
Below, by reference to the accompanying drawings the utility model is described in detail.
As shown in Figure 1, present embodiments provide and a kind ofly export adjustable regulated power supply dummy load circuit, comprise the comparison circuit and switching circuit that are connected with regulated power supply output cathode, when comparison circuit finds regulated power supply output voltage higher than set point, switching circuit turns off, when comparison circuit finds regulated power supply output voltage lower than set point, switching circuit conducting.
Wherein, described comparison circuit comprises: resistance R39, R46, R888 of connecting successively, after series connection, one end of resistance R39 is connected with the output positive input terminal of adjustable voltage, after series connection, one end of resistance R888 is by electric capacity C31 ground connection, other one end of electric capacity C31 is connected with the inverting input of comparator N4, electric capacity C31 is also parallel with resistance R64, the in-phase input end of comparator N4 is connected with reference voltage by resistance R60, the in-phase input end of comparator N4 is also connected with the output of comparator N4 by resistance R51, and the output of comparator N4 is connected with switching circuit.Described reference voltage is 2.5V.
Wherein, described switching circuit comprises: the grid of NMOS tube Q7 is connected with described comparison circuit, and the drain electrode of NMOS tube Q7 is connected with the output cathode of regulated power supply by resistance R43, the source ground of NMOS tube Q7, and the grid of NMOS tube Q7 is also by resistance R65 ground connection.
The dummy load switching point of regulated power supply output voltage is set by the resistance changing resistance, when output voltage being transferred to the output voltage of setting, after dividing potential drop, the negative pole of comparator N4 is greater than the magnitude of voltage of reference voltage 2.5V, the output of comparator N4 exports as 0V, when the output voltage of regulated power supply is lowered to the output voltage of setting, after dividing potential drop, the inverting input of comparator N4 is less than the magnitude of voltage of reference voltage 2.5V, and the output of comparator N4 exports as VCCS, is generally 12V.
Resistance R43 is dummy resistance, and R65 is the discharge resistance of NMOS tube Q7, and when the output of the N4 of comparator exports as VCCS, NMOS tube Q7 conducting, dummy load R43 works.When the output of comparator N4 exports as 0V, NMOS tube Q7 turns off, and dummy load R43 does not work.
Such as, it is 0 ~ 250Vdc that power supply exports adjustable extent, can according to practical application request, allow power supply below set point exports, dummy load circuit work, when power supply exports higher than set point, dummy load circuit does not work, effectively can control the maximum power dissipation value of dummy load, be beneficial to the space structure design of power supply, promote operating efficiency during power supply High voltage output simultaneously.
Adjustable regulated power supply dummy load circuit is exported described in the present embodiment, the circuit be made up of comparator N4 and NMOS tube Q7 is only needed to form, circuit is very simple, use the NMOS tube of some simply conventional amplifiers and SOT-23 encapsulation, without the need to the IC chip of complexity, therefore, described in the present embodiment, circuit cost is also cheaper, efficiently solve the impact of traditional circuit on power-efficient and process structure, dummy load switching point can set and accurately, and control method is easy, flexible, easily realize.
In sum, adjustable regulated power supply dummy load circuit is exported described in the present embodiment, by increasing comparison circuit and switching circuit in adjustable power circuit, and when comparison circuit finds regulated power supply output voltage higher than set point, switching circuit turns off, when comparison circuit finds regulated power supply output voltage lower than set point, the mode of switching circuit conducting, make dummy load circuit changeable between the high low value of regulated power supply output voltage, improve the operating efficiency of regulated power supply, circuit structure is simple, with low cost.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1. one kind exports adjustable regulated power supply dummy load circuit, it is characterized in that, comprise the comparison circuit and switching circuit that are connected with regulated power supply output cathode, when comparison circuit finds regulated power supply output voltage higher than set point, switching circuit turns off, when comparison circuit finds regulated power supply output voltage lower than set point, switching circuit conducting.
2. regulated power supply dummy load circuit according to claim 1, it is characterized in that, described comparison circuit comprises: the resistance R39 connected successively, R46, R888, after series connection, one end of resistance R39 is connected with the output in-phase input end of adjustable voltage, after series connection, one end of resistance R888 is by electric capacity C31 ground connection, other one end of electric capacity C31 is connected with the inverting input of comparator N4, electric capacity C31 is also parallel with resistance R64, the in-phase input end of comparator N4 is connected with reference voltage by resistance R60, the in-phase input end of comparator N4 is also connected with the output of comparator N4 by resistance R51, the output of comparator N4 is connected with switching circuit.
3. regulated power supply dummy load circuit according to claim 2, is characterized in that, described reference voltage is 2.5V.
4. the regulated power supply dummy load circuit according to claims 1 or 2, it is characterized in that, described switching circuit comprises: the grid of NMOS tube Q7 is connected with described comparison circuit, the drain electrode of NMOS tube Q7 is connected with the output cathode of regulated power supply by resistance R43, the source ground of NMOS tube Q7, the grid of NMOS tube Q7 is also by resistance R65 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521039163.7U CN205178884U (en) | 2015-12-15 | 2015-12-15 | False load circuit of output adjustable adjustable power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521039163.7U CN205178884U (en) | 2015-12-15 | 2015-12-15 | False load circuit of output adjustable adjustable power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205178884U true CN205178884U (en) | 2016-04-20 |
Family
ID=55742814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521039163.7U Expired - Fee Related CN205178884U (en) | 2015-12-15 | 2015-12-15 | False load circuit of output adjustable adjustable power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205178884U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338699A (en) * | 2016-10-18 | 2017-01-18 | 成都前锋电子仪器有限责任公司 | Dummy load circuit |
-
2015
- 2015-12-15 CN CN201521039163.7U patent/CN205178884U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338699A (en) * | 2016-10-18 | 2017-01-18 | 成都前锋电子仪器有限责任公司 | Dummy load circuit |
| CN106338699B (en) * | 2016-10-18 | 2023-04-18 | 成都前锋电子仪器有限责任公司 | Dummy load circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20201215 |