CN202261002U - Conduction control circuit with dummy load resistor inside direct-current power supply - Google Patents
Conduction control circuit with dummy load resistor inside direct-current power supply Download PDFInfo
- Publication number
- CN202261002U CN202261002U CN201120337856XU CN201120337856U CN202261002U CN 202261002 U CN202261002 U CN 202261002U CN 201120337856X U CN201120337856X U CN 201120337856XU CN 201120337856 U CN201120337856 U CN 201120337856U CN 202261002 U CN202261002 U CN 202261002U
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- power supply
- load resistor
- current power
- direct
- control circuit
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Abstract
The utility model relates to the technical field of direct-current power supply, in particular to a conduction control circuit with a dummy load resistor inside a direct-current power supply. The conduction control circuit with the dummy load resistor inside the direct-current power supply is characterized by comprising an MOS (Metal Oxide Semiconductor) transistor connected with the false load resistor in series, wherein the MOS transistor is connected with a geminate triode circuit constituted by a triode A and a triode B, and the geminate triode circuit is connected with a photocoupler which is connected with a direct-current power supply master control single-chip microcomputer capable of outputting PWM (Pulse-Width Modulation) waves. According to the conduction control circuit with the dummy load resistor inside the direct-current power supply, for the direct-current power supply output in a wide voltage range, the resistivity and the power of the false load resistor can be selected very conveniently, the false load resistor is basically maintained under a constant power state, meanwhile, the power consumption of the false load resistor is reduced when the direct-current power supply outputs higher voltage, and the dynamic characteristic of the false load resistor is promoted when the direct-current power supply outputs lower voltage.
Description
(1) technical field
The utility model relates to the DC power supply technical field, the turn-on control circuit of the inner dummy resistance of particularly a kind of DC power supply.
(2) background technology
The output of DC power supply generally has the bigger filter capacitor of capacity, guarantee output voltage stabilization must be on output filter capacitor power resistor of parallel connection, as the dummy load of DC power supply.When DC power supply is fixed voltage output or adjusting range when not being very big, the resistance of dummy resistance and power ratio confirm that better when DC power supply output voltage adjusting range was big, there was following problem in the dummy resistance of use fixed resistance value:
1, the electric current on the dummy resistance changes with the output voltage of DC power supply, and the electric current when output voltage is high in the dummy load is big, requires dummy load power big, and the loss of DC power supply increases.
2, can strengthen the dummy load resistance for the power loss that reduces on the dummy resistance, but DC power supply is big and the dummy load discharge is slow because of output filter capacitor when output voltage is low, causes DC power supply dynamic characteristic variation.
(3) summary of the invention
The utility model provides a kind of turn-on control circuit that makes dummy resistance remain on the inner dummy resistance of DC power supply under the permanent power rating basically in order to remedy the defective of prior art.
The utility model is realized through following technical scheme:
The turn-on control circuit of the inner dummy resistance of a kind of DC power supply; It is characterized in that: comprise the metal-oxide-semiconductor that is connected in series mutually with dummy resistance; Metal-oxide-semiconductor is connected to the pipe circuit with triode A, triode B composition; Said to the pipe circuit be connected with optical coupler, optical coupler is connected with the DC power supply main control singlechip of exportable PWM ripple.
To the wide DC power supply of output voltage adjustable range; Turn-on control circuit to its dummy resistance increase; The conducting duty ratio of adjustment dummy resistance; When the DC power supply output voltage was low, dummy resistance conducting duty ratio strengthened, and raising with output voltage constantly reduces the conducting duty ratio of dummy resistance.No matter how the DC power supply output voltage changes, through changing the conducting duty ratio of dummy resistance, make the average voltage that is added on the dummy resistance constant basically, dummy resistance is remained under the permanent power rating basically.
The beneficial effect of the utility model is: the turn-on control circuit of the inner dummy resistance of this DC power supply; DC power supply to wide-voltage range output; The resistance of its dummy resistance and power can be chosen very easily; Dummy resistance remains under the permanent power rating basically, has also reduced the dummy resistance power consumption when the DC power supply output voltage is higher simultaneously, has promoted the dynamic characteristic when the DC power supply output voltage is low.
(4) description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Accompanying drawing 1 is the structural representation of the turn-on control circuit of the inner dummy resistance of the utility model DC power supply.
Among the figure, R6 dummy resistance, U2MOS pipe, N1 triode A, P1 triode B, U1 optical coupler.
(5) embodiment
Accompanying drawing is a kind of specific embodiment of the utility model.
Among Fig. 1; The turn-on control circuit of the inner dummy resistance of this DC power supply; It is characterized in that: comprise the metal-oxide-semiconductor U2 that is connected in series mutually with dummy resistance R6; What metal-oxide-semiconductor U2 and triode AN1, triode BP1 formed is connected to the pipe circuit, said the pipe circuit is connected with optical coupler U1, and optical coupler U1 is connected with the DC power supply main control singlechip of exportable PWM ripple.Wherein, The pin of optical coupler U1P521 is received a port of DC power supply main control singlechip, the PWM ripple of an EDM Generator of Adjustable Duty Ratio of this port output of single-chip microcomputer, and this PWM ripple is isolated through optical coupler U1P521; Again through triode AN18050 and triode BP18550 form to managing circuit; Driven MOS pipe U240N50 has electric current to flow through on the dummy resistance R6 when metal-oxide-semiconductor U240N50 opens, and the last no current of dummy resistance R6 flow through when metal-oxide-semiconductor U240N50 turn-offed.
The output voltage that DC power supply main control singlechip measuring circuit can be measured DC power supply in real time changes, and control program calculates the duty ratio of output PWM according to output voltage values.The PWM duty ratio was big when output voltage was high, and the PWM duty ratio was little when output voltage was low, and the amplitude of PWM duty ratio adjustment does not become principle basically with the average voltage on the dummy resistance R6.Be that last electric current of how many dummy resistance R6 and power consumption are constant basically regardless of the DC power supply output voltage like this, DC power supply also can keep output voltage dynamic characteristic preferably.The PWM ripple duty ratio of control dummy resistance R6 conducting and shutoff can be calculated by following formula: duty ratio=U1/U2 (U1 is the design average voltage on the dummy resistance R6, and U2 is the real-time output voltage of DC power supply).
With the output maximum voltage is that the DC power supply of 300V is an example; But when output voltage range be 0V to the 300V timing, dummy resistance R6 can choose the power resistor of 10 Europe/100W, output voltage conducting duty ratio of dummy load when 10V is following is 100%; Output voltage is during greater than 10V; Dummy load conducting duty ratio reduces gradually, and the average voltage that reduces to be added on the dummy resistance R6 by control of duty ratio is that 10V is a principle, about the average current 1A in the dummy load; Can steady operation through the test DC power supply, the output dynamic characteristic of dummy load characteristic and DC power supply can both meet the demands.When the DC power supply output voltage is greater than 10V in this example; (U is the DC power supply actual output voltage to the duty ratio=10V/U of SCM PWM ripple; Span 10V-300V; Change the conducting duty ratio of adjustment dummy resistance R6 in real time according to the DC power supply output voltage), in conjunction with the test data of experiment checking, the conducting control of DC power supply dummy load has reached more satisfactory result.
Claims (1)
1. the turn-on control circuit of the inner dummy resistance of a DC power supply; It is characterized in that: comprise the metal-oxide-semiconductor (U2) that is connected in series mutually with dummy resistance (R6); Metal-oxide-semiconductor (U2) is connected to the pipe circuit with triode A (N1), triode B (P1) composition; Said to the pipe circuit be connected with optical coupler (U1), optical coupler (U1) is connected with the DC power supply main control singlechip of exportable PWM ripple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120337856XU CN202261002U (en) | 2011-09-09 | 2011-09-09 | Conduction control circuit with dummy load resistor inside direct-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120337856XU CN202261002U (en) | 2011-09-09 | 2011-09-09 | Conduction control circuit with dummy load resistor inside direct-current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202261002U true CN202261002U (en) | 2012-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120337856XU Expired - Fee Related CN202261002U (en) | 2011-09-09 | 2011-09-09 | Conduction control circuit with dummy load resistor inside direct-current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202261002U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458597A (en) * | 2013-09-23 | 2013-12-18 | 宁勤顺 | Voltage type power adjusting device of electronic ballast of xenon lamp and using method thereof |
| CN103529341A (en) * | 2013-11-04 | 2014-01-22 | 长沙威胜信息技术有限公司 | Remote control loop detection circuit for negative control terminal |
| CN103701354A (en) * | 2013-12-28 | 2014-04-02 | 吉林大学 | Electrical source transmitter device with self-adaption dummy load and control method |
| 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 |
-
2011
- 2011-09-09 CN CN201120337856XU patent/CN202261002U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458597A (en) * | 2013-09-23 | 2013-12-18 | 宁勤顺 | Voltage type power adjusting device of electronic ballast of xenon lamp and using method thereof |
| CN103458597B (en) * | 2013-09-23 | 2016-03-09 | 宁勤顺 | Xenon lamp electric ballast voltage-type power adjustment apparatus and using method thereof |
| CN103529341A (en) * | 2013-11-04 | 2014-01-22 | 长沙威胜信息技术有限公司 | Remote control loop detection circuit for negative control terminal |
| CN103701354A (en) * | 2013-12-28 | 2014-04-02 | 吉林大学 | Electrical source transmitter device with self-adaption dummy load and control method |
| CN103701354B (en) * | 2013-12-28 | 2015-12-30 | 吉林大学 | There is grounded source transmitter installation and the control method of self adaptation dummy load |
| 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 |
| CN110417288B (en) * | 2019-08-06 | 2021-01-15 | 珠海格力电器股份有限公司 | Novel switching power supply driving circuit and control method thereof |
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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: 20120530 Termination date: 20180909 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |