CN201860263U - Variable-load circuit - Google Patents
Variable-load circuit Download PDFInfo
- Publication number
- CN201860263U CN201860263U CN2010206124274U CN201020612427U CN201860263U CN 201860263 U CN201860263 U CN 201860263U CN 2010206124274 U CN2010206124274 U CN 2010206124274U CN 201020612427 U CN201020612427 U CN 201020612427U CN 201860263 U CN201860263 U CN 201860263U
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- Prior art keywords
- circuit
- resistance
- load
- voltage
- load circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a variable-load circuit which comprises a sampling circuit, a comparison drive circuit and a voltage stabilizing load circuit, wherein the sampling circuit transmits sampled signals of output voltage to the input end of the comparison drive circuit, and after the signals are processed by the comparison drive circuit, drive signals are transmitted to the input end of the voltage stabilizing load circuit. Voltage stabilization is realized by adding a power consuming load at the output end of a switching power supply circuit, the connection and the disconnection of the power consuming load are realized through the on-off operation of a drive triode which is controlled by a comparator to which the sampled signals of the voltage sampling circuit are transmitted, and thereby the output voltage of a switching power supply can be kept stable.
Description
Technical field
The utility model relates to a kind of power circuit, especially a kind of varying load circuit.
Background technology
Now, Switching Power Supply is widely used in various electric equipment products, but no matter be AC/DC, or DC/DC Switching Power Supply, very wide and when input high pressure output zero load or load variations were very big, output voltage can be high more a lot of than normal voltage when input voltage range, voltage stabilizing is bad and voltage pole is unstable.
The utility model content
The utility model technical issues that need to address provide a kind of when output zero load or load variations are very big, make the varying load circuit of output voltage stabilization.
For addressing the above problem, technical solution adopted in the utility model is: a kind of varying load circuit, comprise sample circuit, compare drive circuit, the voltage regulation load circuit, wherein sample circuit sends to the input of comparison drive circuit with the sampled signal of output voltage, the input of giving the voltage regulation load circuit with drive signal after relatively drive circuit is handled.
Described sample circuit comprises resistance R 226, R227, R0, is connected to the output of Switching Power Supply after resistance R 226, R227, the R0 series connection, and the sampled signal of its resistance R 0 is delivered to the comparison drive circuit.
Described relatively drive circuit comprises comparator N1, resistance R 223,224,225, capacitor C 214, triode V216, wherein adopt signal to deliver to the in-phase end of comparator N1 by resistance R 225, the output signal of comparator N1 is delivered to the base stage of triode V216 by resistance R 223, and the triode Continuity signal is delivered to the voltage regulation load circuit.
Adopt the beneficial effect that technique scheme produced to be: this is novel by increasing the power consumption load at the switching power circuit output, reach voltage stabilizing, the access of power consumption load is sampled by voltage sampling circuit, delivering to the conducting of comparator controlling and driving triode turn-offs, control the access state of power consumption load, thereby make the output voltage stabilization of Switching Power Supply.
Description of drawings
Fig. 1 is the utility model theory diagram;
Fig. 2 is the utility model schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is done and to be described in further detail: as shown in Figure 1, a kind of varying load circuit, comprise sample circuit, compare drive circuit, the voltage regulation load circuit, wherein sample circuit sends to the input of comparison drive circuit with the sampled signal of output voltage, the input of giving the voltage regulation load circuit with drive signal after relatively drive circuit is handled.
Figure 2 shows that the circuit theory diagrams of the embodiment that this is novel, wherein sample circuit comprises resistance R 226, R227, R0, is connected to the output of Switching Power Supply after resistance R 226, R227, the R0 series connection, and the sampled signal of its resistance R 0 is delivered to the comparison drive circuit.Relatively drive circuit comprises comparator N1, resistance R 223,224,225, capacitor C 214, triode V216, wherein adopt signal to deliver to the in-phase end of comparator N1 by resistance R 225, the output signal of comparator N1 is delivered to the base stage of triode V216 by resistance R 223, and the triode Continuity signal is delivered to the voltage regulation load circuit.
Operation principle:
When input high pressure output zero load is between 20% nominal load, sampling resistor R0 pressure drop makes resistance R 226, R227 dividing point current potential (being comparator N1 in-phase end) be higher than the end of oppisite phase current potential, so comparator N1 exports high level, make triode V216 conducting, power consumption load RL2 is inserted the Switching Power Supply output, cause output just no longer unloaded, consume certain energy and make output voltage stabilization.When operating load surpasses 20% nominal load, sampling resistor R0 pressure drop makes R226, R227 dividing point current potential (being comparator N1 in-phase end) be lower than the end of oppisite phase current potential, comparator N1 output low level, RL2 disconnects from output the power consumption load, and no longer consumes useless energy.Efficient is uprised.
Claims (3)
1. varying load circuit, it is characterized in that: comprise sample circuit, compare drive circuit, the voltage regulation load circuit, wherein sample circuit sends to the input of comparison drive circuit with the sampled signal of output voltage, the input of giving the voltage regulation load circuit with drive signal after relatively drive circuit is handled.
2. varying load circuit according to claim 1 is characterized in that: sample circuit comprises resistance R 226, R227, R0, is connected to the output of Switching Power Supply after resistance R 226, R227, the R0 series connection, and the sampled signal of its resistance R 0 is delivered to the comparison drive circuit.
3. varying load circuit according to claim 1, it is characterized in that: relatively drive circuit comprises comparator N1, resistance R 223,224,225, capacitor C 214, triode V216, wherein adopt signal to deliver to the in-phase end of comparator N1 by resistance R 225, the output signal of comparator N1 is delivered to the base stage of triode V216 by resistance R 223, and the triode Continuity signal is delivered to the voltage regulation load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206124274U CN201860263U (en) | 2010-11-18 | 2010-11-18 | Variable-load circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206124274U CN201860263U (en) | 2010-11-18 | 2010-11-18 | Variable-load circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201860263U true CN201860263U (en) | 2011-06-08 |
Family
ID=44106062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206124274U Expired - Fee Related CN201860263U (en) | 2010-11-18 | 2010-11-18 | Variable-load circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201860263U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021912A (en) * | 2014-04-29 | 2015-11-04 | 全汉企业股份有限公司 | Load circuit and load device for LED driver burn-in test |
-
2010
- 2010-11-18 CN CN2010206124274U patent/CN201860263U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021912A (en) * | 2014-04-29 | 2015-11-04 | 全汉企业股份有限公司 | Load circuit and load device for LED driver burn-in test |
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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: 20110608 Termination date: 20141118 |
|
| EXPY | Termination of patent right or utility model |