CN202713151U - Adaptive preload circuit - Google Patents
Adaptive preload circuit Download PDFInfo
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- CN202713151U CN202713151U CN 201220343121 CN201220343121U CN202713151U CN 202713151 U CN202713151 U CN 202713151U CN 201220343121 CN201220343121 CN 201220343121 CN 201220343121 U CN201220343121 U CN 201220343121U CN 202713151 U CN202713151 U CN 202713151U
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Abstract
The utility model discloses an adaptive preload circuit, comprising a sampling circuit (SC), an output voltage SC, a comparison circuit and a power amplification circuit. The adaptive preload circuit can control a preload current real-timely and automatically; when an output voltage is higher and a preload is not needed, the adaptive preload circuit can turn off the preload, and when the preload is needed, the adaptive preload circuit can turn on the preload in time; the turn-on time can be realized by adjusting a potentiometer. According to the utility model and during the output voltage adjustment process, the preload needed by the DC-DC converter output is adjusted dynamically along with turning down the output voltage and is adjusted according to the output actual demands, thereby achieving the energy-saving effect.
Description
Technical field
The utility model relates to a kind of field of power supplies technology, particularly a kind of self adaptation preload circuit.
Background technology
Along with the development of Switching Power Supply application technology, the output voltage of present a lot of DC-DC transducer can be regulated continuously.But a lot of DC-DC transducers are adjusted output voltages to being lower than the nominal output voltage to a certain degree the time, output voltage is unstable, need to increase a certain amount of load at the DC-DC converter output end, this load is called for short preload, and the preload of the lower needs of regulation voltage is larger.
The method that addresses this is that now generally all is to divide several stages or not stage by stage with output voltage, and the inherent DC-DC converter output end of each stage or whole output voltage range increases the fixedly preload of value.This kind method has been wasted unnecessary power consumption, reduces the efficient of transducer integral body.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of self adaptation preload circuit, in the output voltage adjustment process, the DC-DC transducer is exported needed preload along with output voltage is turned down and dynamic adjustments, actual needs according to output is regulated the preload size, thereby reaches energy-conservation effect.Connect the DC-DC transducer output contain five port: positive output end+OUT, negative output terminal-OUT, positive output voltage compensation end+S, negative output voltage compensation end-S, output voltage adjustable side SC.Generally the size of the voltage of adjustable side SC and output voltage is directly proportional and is linear relationship.
For the purpose that realizes solving the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of self adaptation preload circuit of the present utility model, connect the DC-DC transducer output contain five port: positive output end+OUT, negative output terminal-OUT, positive output voltage compensation end+S, negative output voltage compensation end-S, output voltage adjustable side SC; Self adaptation preload circuit comprises SC sample circuit, output voltage sampling circuit, comparison circuit, power amplification circuit, wherein:
1) SC sample circuit: the SC sample circuit comprises the first amplifier, the first resistance, the external auxiliary source of amplifier; Port comprise the positive input port namely+IN end, negative input port namely-the IN end, the positive output port namely+OUT end, negative output port namely-the OUT end;
The in the same way input of SC termination first amplifier of DC-DC transducer is SC sample circuit+IN port, the reverse input end of the first amplifier connects the output of the first amplifier, one end of output termination first resistance of the first amplifier, the other end of the first resistance are exactly SC sample circuit+OUT end; The DC-DC transducer-power supply of S termination amplifier ground, also be the SC sample circuit-the IN end and-the OUT end;
2) output voltage sampling circuit: output voltage sampling circuit comprises the second resistance, the 3rd resistance, and port comprises positive input port+IN, negative input port-IN, positive output port+OUT, negative output port-OUT;
DC-DC transducer+S termination the second resistance one end, also be output voltage sampling circuit+the IN port; The other end of the second resistance is the end that output voltage sampling circuit+OUT port connects the 3rd resistance, the other end of the 3rd resistance be output voltage sampling circuit-IN end and-OUT is connected to DC-DC transducer-S end;
3) comparison circuit: comparison circuit comprises the first electric capacity, the second electric capacity, the 5th resistance, the second amplifier; The external auxiliary source of amplifier; Port be positive input port+IN1 and+IN2, negative input port-IN, positive output port+OUT, negative output port-OUT;
The SC sample circuit+reverse input end that the OUT port connects the second amplifier be comparison circuit+the IN1 port; Output voltage sampling circuit+in the same way input that the OUT port connects the second amplifier be comparison circuit+the IN2 port; An end of inputting in the same way termination the first electric capacity of the second amplifier, the reverse input end of another termination the second amplifier of the first electric capacity, the reverse input of the second amplifier connects an end of the second electric capacity, one end of another termination the 5th resistance of the second electric capacity, the output of another termination the second amplifier of the 5th resistance are comparison circuit+OUT port; The DC-DC transducer-be to the power supply of S termination the second amplifier comparison circuit-the IN port and-the OUT port;
4) power amplification circuit: power amplification circuit comprises the 4th resistance, the first diode, the second diode, the 3rd electric capacity, the 6th resistance, power Darlington transistor; Port comprises: positive input port+IN, negative input port-IN, positive output port+OUT, negative output port-OUT1 and-OUT2;
Comparison circuit+the OUT port connect the 4th resistance one end be power amplification circuit+the IN port; The anode of another termination the first diode of the 4th resistance and an end of the 3rd electric capacity; The negative electrode of the first diode connects the base stage of power Darlington transistor and the negative electrode of the second diode; The anode of the other end of the 3rd electric capacity and the second diode all be connected to DC-DC transducer-S end be comparison circuit-the OUT1 port; The DC-DC transducer+collector electrode of S end and power Darlington transistor jointly be connected to the DC-DC transducer+OUT hold be power amplification circuit+the OUT port; The emitting stage of power Darlington transistor connects an end of the 6th resistance, the DC-DC transducer-other end of S end and the 6th resistance be power amplification circuit-the OUT2 port jointly is connected to DC-DC transducer-OUT and holds.
The DC-DC transducer that this patent is different according to SC voltage is chosen suitable auxiliary source, choose here+auxiliary source of 5V.
Preferred the 3rd resistance is adjustable resistance.
The operation principle of self adaptation preload circuit is: wherein when output voltage is turned down, need certain preload to stablize the SC terminal voltage, this circuit is exactly according to the voltage of TRIM/SC end and the size that relatively decides preload of actual output voltage, and preload comes dynamic change according to reality output adjusting needs.Changed like this in original preload circuit as long as the low this shortcoming of wasting power consumption that just is fixed the preload of value to a certain boundary of output voltage always.This circuit can be controlled the preload electric current in real time automatically, and when output voltage was higher, when not needing preload, this circuit can disconnect preload, when the needs preload, can in time connect preload again, and the time of connection can realize by regulating potentiometer; The output voltage values that the DC-DC transducer of different nominal outputs begins to get involved to preload can be different, and this potentiometer can be adjusted the preload intervention time according to actual needs.The size of preload electric current can realize by the resistance that changes on Darlington transistor ground level or the emitting stage, voltage that also can be by changing accessory power supply for example among the figure+the 5V auxiliary source realizes.
In sum, the utility model is fit to the adjustable DC-DC transducer of output voltage, and the preload that consumes when voltage is turned down also is that self adaptation is adjusted according to actual needs, can effectively reduce the waste that the DC-DC transducer is exported required preload when turning down, and saves the energy, raises the efficiency.The introducing of the potentiometer that do not coexist of the preferred circuit maximum that this circuit and VICOR provide.
By adopting technique scheme, the utlity model has following beneficial effect:
The self adaptation preload circuit of this patent, in the output voltage adjustment process, the DC-DC transducer is exported needed preload along with output voltage is turned down and dynamic adjustments, regulates the preload size according to the actual needs of output, thereby reaches energy-conservation effect.
Description of drawings
Fig. 1 is the self adaptation preload circuit of this patent.
Fig. 2 is the left-half enlarged drawing of Fig. 1.
Fig. 3 is the right half part enlarged drawing of Fig. 1.
Among the figure, empty frame 10-SC sample circuit, empty frame 20-output voltage sampling circuit, empty frame 30-comparison circuit, empty frame 40-power amplification circuit, 101-the first amplifier, 201-the first resistance, 102-the second amplifier, 202-the second resistance, 203-the 3rd resistance, 301-the first electric capacity, 302-the second electric capacity, 205-the 5th resistance, 204-the 4th resistance, 401-the first diode, 402-the second diode, 303-the 3rd electric capacity, 206-the 6th resistance, 501-power Darlington transistor.
Embodiment
Embodiment 1
Specific works circuit such as Fig. 1, Fig. 2 and shown in Figure 3.
A kind of self adaptation preload circuit of the present utility model comprises SC sample circuit, output voltage sampling circuit, comparison circuit, power amplification circuit.
Wherein:
1) SC sample circuit: the SC sample circuit comprises the first amplifier 101, the first resistance 201, the external auxiliary source of amplifier; DC-DC transducer that can be different according to SC voltage is chosen suitable auxiliary source, choose here+5V; Port comprise the positive input port namely+IN end, negative input port namely-the IN end, the positive output port namely+OUT end, negative output port namely-the OUT end.
The in the same way input of SC termination first amplifier 101 of DC-DC transducer, also be the SC sample circuit+the IN port; The reverse input end of the first amplifier 101 is received the output of the first amplifier 101, one end of output termination first resistance 201 of the first amplifier 101, the other end of the first resistance 201 connects SC sample circuit+OUT end, the DC-DC transducer-power supply of S termination amplifier ground, also be the SC sample circuit-IN end and-the OUT end, both are a tie point.
2) output voltage sampling circuit: output voltage sampling circuit comprises the second resistance 202, the 3rd resistance 203, and port comprises positive input port+IN, negative input port-IN, positive output port+OUT, negative output port-OUT.
DC-DC transducer+S termination the second resistance 202 1 ends, also be output voltage sampling circuit+the IN port; The other end of the second resistance 202 is the end that output voltage sampling circuit+OUT port connects the 3rd resistance 203, the other end of the 3rd resistance 203 be output voltage sampling circuit-IN end and-OUT is connected to DC-DC transducer-S end.
3) comparison circuit: comparison circuit comprises the first electric capacity 301, the second electric capacity 302, the 5th resistance 205, the second amplifier 102; Public same auxiliary source in the auxiliary source that amplifier is external and the sample circuit; Port be positive input port+IN1 and+IN2, negative input port-IN, positive output port+OUT, negative output port-OUT.
The SC sample circuit+the OUT port connects the reverse input end of the second amplifier 102, also be comparison circuit+the IN1 port; Output voltage sampling circuit+the OUT port connects the in the same way input of the second amplifier 102, also be comparison circuit+the IN2 port; An end of inputting in the same way termination the first electric capacity 301 of the second amplifier 102, the reverse input end of another termination the second amplifier 102 of the first electric capacity 301, the reverse input of the second amplifier 102 connects 302 1 ends of the second electric capacity, one end of another termination the 5th resistance 205 of the second electric capacity 302, the output comparison circuit of another termination the second amplifier 102 of the 5th resistance 205+the OUT port; The DC-DC transducer-power supply of S termination the second amplifier 102 ground, also be comparison circuit-the IN port and-the OUT port, both are a tie point.
4) power amplification circuit: power amplification circuit comprises the 4th resistance 204, the first diode 401, the second diode 402, the 3rd electric capacity 303, the 6th resistance 206, power Darlington transistor; Port comprises: positive input port+IN, negative input port-IN, positive output port+OUT, negative output port-OUT1 and-OUT2.
Comparison circuit+the OUT port connect the 4th resistance 204 1 ends be power amplification circuit+the IN port; The anode of another termination the first diode 401 of the 4th resistance 204 and an end of the 3rd electric capacity 303, the negative electrode of the first diode 401 connects the base stage of power Darlington transistor and the negative electrode of the second diode 402, the anode of the other end of the 3rd electric capacity 303 and the second diode 402 all is connected to DC-DC transducer-S end, namely comparison circuit-the OUT1 port; The DC-DC transducer+collector electrode of S end and power Darlington transistor be power amplification circuit+the OUT port jointly is connected to DC-DC transducer+OUT and holds, the emitting stage of power Darlington transistor connects an end of the 6th resistance 206, the DC-DC transducer-other end of S end and the 6th resistance 206 be power amplification circuit-the OUT2 port jointly is connected to DC-DC transducer-OUT and holds.
The voltage of SC is followed by the first amplifier 101, isolates obtaining V1.
Then V1 is input to the second amplifier 102, and ± S between sampling and the voltage V ＇ that comes compares.The setting of V ＇ will be followed under normal circumstances will be a little less than V1, thereby when guaranteeing normal pressure regulation, the second amplifier comparator is not exported high level.
When normally turning down voltage, V ＇ and V1 all linear along with pressure regulation, synchronously toward descending, this moment, V ＇ can be always less than V1, the second amplifier 102 output low levels, the Darlington transistor of rear end can conducting, preload can not add this moment.
Turn down output voltage until output voltage is transferred when not going down, this moment, V1 also diminished following regulating circuit, and V ＇ no longer descends this moment, thereby caused V ＇＞V1, amplifier output high level, and the Darlington transistor conducting, preload is added to the output two ends.
Voltage is transferred lowlyer, and the high level of the second amplifier 102 outputs is higher, and this moment, the Darlington transistor base current was larger, and preload is also just larger.
This circuit can be controlled the preload electric current in real time automatically, and when output voltage was higher, when not needing preload, this circuit can disconnect preload, when the needs preload, can in time connect preload again, and the time of connection can realize by regulating potentiometer; The output voltage values that the DC-DC transducer of different nominal outputs begins to get involved to preload can be different, and this potentiometer can be adjusted the preload intervention time according to actual needs; The size of preload electric current can realize by the resistance that changes on Darlington transistor ground level or the emitting stage, also can be by changing the voltage swing of accessory power supply.
Claims (2)
1. self adaptation preload circuit, connect the DC-DC transducer output contain five port: positive output end+OUT, negative output terminal-OUT, positive output voltage compensation end+S, negative output voltage compensation end-S, output voltage adjustable side SC; It is characterized in that: self adaptation preload circuit comprises SC sample circuit, output voltage sampling circuit, comparison circuit, power amplification circuit, wherein:
1) SC sample circuit: the SC sample circuit comprises the first amplifier, the first resistance, the external auxiliary source of amplifier; Port comprise the positive input port namely+IN end, negative input port namely-the IN end, the positive output port namely+OUT end, negative output port namely-the OUT end;
The in the same way input of SC termination first amplifier of DC-DC transducer is SC sample circuit+IN port, the reverse input end of the first amplifier connects the output of the first amplifier, one end of output termination first resistance of the first amplifier, the other end of the first resistance are exactly SC sample circuit+OUT end; The DC-DC transducer-power supply of S termination amplifier ground, also be the SC sample circuit-the IN end and-the OUT end;
2) output voltage sampling circuit: output voltage sampling circuit comprises the second resistance, the 3rd resistance, and port comprises positive input port+IN, negative input port-IN, positive output port+OUT, negative output port-OUT;
DC-DC transducer+S termination the second resistance one end, also be output voltage sampling circuit+the IN port; The other end of the second resistance is the end that output voltage sampling circuit+OUT port connects the 3rd resistance, the other end of the 3rd resistance be output voltage sampling circuit-IN end and-OUT is connected to DC-DC transducer-S end;
3) comparison circuit: comparison circuit comprises the first electric capacity, the second electric capacity, the 5th resistance, the second amplifier; The external auxiliary source of amplifier; Port be positive input port+IN1 and+IN2, negative input port-IN, positive output port+OUT, negative output port-OUT;
The SC sample circuit+reverse input end that the OUT port connects the second amplifier be comparison circuit+the IN1 port; Output voltage sampling circuit+in the same way input that the OUT port connects the second amplifier be comparison circuit+the IN2 port; An end of inputting in the same way termination the first electric capacity of the second amplifier, the reverse input end of another termination the second amplifier of the first electric capacity, the reverse input of the second amplifier connects an end of the second electric capacity, one end of another termination the 5th resistance of the second electric capacity, the output of another termination the second amplifier of the 5th resistance are comparison circuit+OUT port; The DC-DC transducer-be to the power supply of S termination the second amplifier comparison circuit-the IN port and-the OUT port;
4) power amplification circuit: power amplification circuit comprises the 4th resistance, the first diode, the second diode, the 3rd electric capacity, the 6th resistance, power Darlington transistor; Port comprises: positive input port+IN, negative input port-IN, positive output port+OUT, negative output port-OUT1 and-OUT2;
Comparison circuit+the OUT port connect the 4th resistance one end be power amplification circuit+the IN port; The anode of another termination the first diode of the 4th resistance and an end of the 3rd electric capacity; The negative electrode of the first diode connects the base stage of power Darlington transistor and the negative electrode of the second diode; The anode of the other end of the 3rd electric capacity and the second diode all be connected to DC-DC transducer-S end be comparison circuit-the OUT1 port; The DC-DC transducer+collector electrode of S end and power Darlington transistor jointly be connected to the DC-DC transducer+OUT hold be power amplification circuit+the OUT port; The emitting stage of power Darlington transistor connects an end of the 6th resistance, the DC-DC transducer-other end of S end and the 6th resistance be power amplification circuit-the OUT2 port jointly is connected to DC-DC transducer-OUT and holds.
2. self adaptation preload circuit according to claim 1, it is characterized in that: described the 3rd resistance (203) is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220343121 CN202713151U (en) | 2012-07-16 | 2012-07-16 | Adaptive preload circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220343121 CN202713151U (en) | 2012-07-16 | 2012-07-16 | Adaptive preload circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202713151U true CN202713151U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220343121 Expired - Fee Related CN202713151U (en) | 2012-07-16 | 2012-07-16 | Adaptive preload circuit |
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| CN (1) | CN202713151U (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 |
-
2012
- 2012-07-16 CN CN 201220343121 patent/CN202713151U/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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| 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: 20130130 Termination date: 20190716 |