CN202330674U - Constant-current electronic load with soft start - Google Patents
Constant-current electronic load with soft start Download PDFInfo
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- CN202330674U CN202330674U CN 201120485855 CN201120485855U CN202330674U CN 202330674 U CN202330674 U CN 202330674U CN 201120485855 CN201120485855 CN 201120485855 CN 201120485855 U CN201120485855 U CN 201120485855U CN 202330674 U CN202330674 U CN 202330674U
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Abstract
The utility model discloses a constant-current electronic load with soft start, which comprises load access terminals V+ and V-, a voltage-stabilization output circuit, a reference voltage circuit, an electrifying time-delay start circuit and an analog constant-current load circuit, wherein the load access terminals V+ and V- is connected with the access end of the analog constant-current load circuit; the input voltage of the access end of the analog constant-current load circuit is input into the standard voltage input end of the analog constant-current load circuit successively by the voltage-stabilization output circuit, the reference voltage circuit and the electrifying time-delay start circuit; the electrifying time-delay start circuit comprises a capacitor C2 connected to the standard voltage input end of the analog constant-current load circuit in parallel; the electrifying time-delay start circuit also comprises a diode D1 and a power failure quick discharging circuit; the diode D1 is connected with the analog constant-current load circuit in series to prevent the polarity from being oppositely connected; and the power failure quick discharging circuit is subjected to bridge joint between the input end of the voltage-stabilization output circuit and the output end of the electrifying time-delay start circuit. In the aging test of the LED (Light Emitting Diode) power supply, the constant-current electronic load replaces the resistance load and simulates LED load to guarantee that the power test is normal.
Description
Technical field
The utility model relates to a kind of load of the LED of being useful for power supply, particularly a kind of constant current electronic load with soft start function.
Background technology
In order to reduce LED constant current source no-load power consumption and short-circuit dissipation; It is bigger that soft start resistance is generally got; When the LED power source aging is tested, generally adopt ohmic load to carry out burn-in test, but for ohmic load; Occur the phenomenon that can't start sometimes, to occur output voltage sometimes unusual for power supply when load was switched.In order to adapt to the test needs of LED constant current source, need design the electronic load that meets LED constant current source characteristic.
Summary of the invention
The purpose of the utility model is exactly the electronic load that design meets LED constant current source characteristic, proposes the slow constant current electronic load that starts of band, in the burn-in test of LED power supply, and the substitutional resistance load, simulation LED load guarantees that power supply test is no abnormal.
For realizing above-mentioned purpose; The slow constant current electronic load that starts of the utility model band; Comprise that load inserts terminal V+V-, voltage-stabilizing output circuit, reference voltage circuit, delayed startup circuit and simulation Constant Current Load circuit power on; Load inserts the incoming end L1L2 that terminal V+V-connects simulation Constant Current Load circuit; Through the reference voltage input of voltage-stabilizing output circuit, reference voltage circuit, the delayed startup circuit that powers on input simulation Constant Current Load circuit, the said delayed startup circuit that powers on comprises the capacitor C 2 on the reference voltage input that is connected in parallel on simulation Constant Current Load circuit to the input voltage V1 of this simulation Constant Current Load circuit incoming end L1L2 successively.
Can comprise that also anti-stop polarity meets anti-diode D1, this diode D1 connects with simulation Constant Current Load circuit, and above-mentioned load inserts terminal V+V-and connects the two ends after diode D1 connects with simulation Constant Current Load circuit.
Also can comprise the power down quick discharging circuit, be connected across the input end of voltage-stabilizing output circuit and the output terminal of the delayed startup circuit that powers between so that guarantee to power on delay effect when restarting.
The above-mentioned delayed startup circuit that powers on also can comprise resistance R 2, R4, and the reference voltage of reference voltage circuit output is imported the reference voltage input of simulation Constant Current Load circuit after resistance R 2, R4 dividing potential drop.Said resistance R 4 can be adjustable resistance.
In one embodiment; Above-mentioned power down quick discharging circuit comprises resistance R 3, R8, R9, R10 and NPN triode Q2, Q3; The input voltage V1 of simulation Constant Current Load circuit incoming end L1L2 is through resistance R 8, R10 dividing potential drop; Between the base stage and emitter of input triode Q3; Also between the base stage and emitter of resistance R 9 input triode Q2, the collector of triode Q3 connects the base stage of triode Q2 to input voltage V1 of this simulation Constant Current Load circuit incoming end L1L2, and the collector of triode Q2 is through the Connect Power output terminal of delayed startup circuit of resistance R 3.Above-mentioned power down quick discharging circuit also can comprise the stabilivolt D3 with resistance R 8 series connection.Above-mentioned power down quick discharging circuit also can comprise the capacitor C 7 with resistance R 10 parallel connections.
The utility model is owing to utilize the incoming end input voltage; Through being used for control simulation Constant Current Load circuit after the voltage stabilizing; Cooperate the delayed startup circuit that powers on; So can make the load current of the utility model slowly rise to rated current, increase the power down quick discharging circuit again, the delay effect when having guaranteed to restart from 0mA.The utility model need not externally fed, and directly power taking inserts voltage in load, and visible the utility model is realized passive soft slow startup, need not software delay and other hardware time-delays, and cost is low.The utility model can be simulated the LED load, satisfies the LED load characteristic, i.e. currentless characteristics during low-voltage.
In the practical application, with the shape that the wiring board and the power device of the utility model is packaged into high-power resistance, be the electronic load that has polarity (V+, V-).This electronic load can use with series connection in parallel connection, and reversal connection is invalid.The load of different electric currents and power be can become according to Demand Design, the string and the combination of load made things convenient for.
Description of drawings
Fig. 1 is the circuit block diagram of embodiment;
Fig. 2 is the circuit theory diagrams of embodiment;
Fig. 3 is a kind of power on delayed startup circuit and power down quick discharging circuit schematic diagram of form;
Fig. 4 is the circuit theory diagrams that on the basis of Fig. 3, increase stabilivolt D3;
Fig. 5 uses for the utility model and connects synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is described in detail.
Like Fig. 1, shown in Figure 2; The utility model embodiment comprises that load inserts terminal V+V-, voltage-stabilizing output circuit 1, reference voltage circuit 2, the delayed startup circuit 3 that powers on, power down quick discharging circuit 4, simulation Constant Current Load circuit 5 and anti-stop polarity and meets anti-diode D1; Voltage-stabilizing output circuit 1 provides voltage stabilizing output+VCC; Reference voltage circuit 2 provides stable 2.5V reference voltage; Simulation Constant Current Load circuit 5 is selected classical simulation Constant Current Load circuit for use; Diode D1 and 5 series connection of simulation Constant Current Load circuit; Load inserts the two ends after terminal V+V-connects diode D1 and 5 series connection of simulation Constant Current Load circuit, and the input voltage V1 of simulation Constant Current Load circuit 5 incoming end L1L2 is successively through the reference voltage input of voltage-stabilizing output circuit 1, reference voltage circuit 2, the delayed startup circuit 3 input simulation Constant Current Load circuit 5 that power on, power down quick discharging circuit 4 be connected across the input end of voltage-stabilizing output circuit 1 and the output terminal of the delayed startup circuit 3 that powers between.
The delayed startup circuit 3 that powers on comprises resistance R 2, R4 and capacitor C 2; The reference voltage of reference voltage circuit 2 outputs is imported the reference voltage input of simulation Constant Current Load circuit 5 after resistance R 2, R4 dividing potential drop; Resistance R 4 is an adjustable resistance, and capacitor C 2 is connected in parallel on the reference voltage input of simulation Constant Current Load circuit 5.Powered on moment, the voltage on the capacitor C 2 are zero, and the load current of simulation Constant Current Load circuit 5 is zero; Subsequently; Voltage on the capacitor C 2 slowly increases to the reference voltage after the dividing potential drop, and the load current of simulation Constant Current Load circuit 5 slowly rises to rated current from 0mA, satisfies the LED load characteristic.
Power down quick discharging circuit 4 comprises resistance R 3, R8, R9, R10, capacitor C 7 and NPN triode Q2, Q3; The input voltage V1 of simulation Constant Current Load circuit 5 incoming end L1L2 is through resistance R 8, R10 dividing potential drop; Between the base stage and emitter of input triode Q3; Capacitor C 7 and resistance R 10 parallel connections; Also between the base stage and emitter of resistance R 9 input triode Q2, the collector of triode Q3 connects the base stage of triode Q2 to the input voltage V1 of simulation Constant Current Load circuit 5 incoming end L1L2, and the collector of triode Q2 is through the Connect Power output terminal of delayed startup circuit 3 of resistance R 3.After the input voltage V1 of simulation Constant Current Load circuit 5 incoming end L1L2 is reduced to certain value, (promptly when R10/ (R8+R10) * V1＜0.6V, V1＜10V) at this moment; Triode Q3 turn-offs; Triode Q2 conducting, capacitor C 2 be through resistance R 3 rapid discharges, guarantees once more electrifying startup moment; Voltage on the capacitor C 2 is zero, the delay effect when restarting thereby assurance powers on.The effect of capacitor C 7 is powered on moment, and triode Q3 ends, and triode Q2 conducting guarantees that capacitor C 2 keeps low-voltage, increases the time-lag action of the utility model electrifying startup, makes the function of soft slow startup be able to further reinforcement.
As shown in Figure 3; Power on delayed startup circuit and power down quick discharging circuit schematic diagram for a kind of form; The delayed startup circuit 3 that powers on of delayed startup circuit and embodiment of powering on is the same, and the power down quick discharging circuit 4 of power down quick discharging circuit and embodiment relatively lacks capacitor C 7.
As shown in Figure 4, on the basis of Fig. 3, increasing the circuit theory diagrams of stabilivolt D3, after the input voltage V1 of simulation Constant Current Load circuit incoming end L1L2 is reduced to certain value; (promptly when R10/ (R8+R10) * (V1-VF)＜0.6V; This moment, V1＜10V+VF), triode Q3 turn-offed, triode Q2 conducting; Capacitor C 2 can improve acting input voltage V1 value through resistance R 3 rapid discharges through stabilivolt D3.
Equally can be at the resistance R 10 two ends shunt capacitance C7 of circuit shown in Figure 4.
As shown in Figure 5, use the connection synoptic diagram for the utility model, wherein (1) is parallel-connection structure, and (2) are cascaded structure, and (3) are mixed structure, and E+E-is the output voltage positive and negative terminal of LED power supply.
Claims (10)
1. band delays the constant current electronic load that starts; It is characterized in that: comprise that load inserts terminal V+V-, voltage-stabilizing output circuit, reference voltage circuit, delayed startup circuit and simulation Constant Current Load circuit power on; Load inserts the incoming end L1L2 that terminal V+V-connects simulation Constant Current Load circuit; Through the reference voltage input of voltage-stabilizing output circuit, reference voltage circuit, the delayed startup circuit that powers on input simulation Constant Current Load circuit, the said delayed startup circuit that powers on comprises the capacitor C 2 on the reference voltage input that is connected in parallel on simulation Constant Current Load circuit to the input voltage V1 of this simulation Constant Current Load circuit incoming end L1L2 successively.
2. the slow constant current electronic load that starts of band according to claim 1; It is characterized in that: comprise that also anti-stop polarity meets anti-diode D1; This diode D1 connects with simulation Constant Current Load circuit, and said load inserts terminal V+V-and connects the two ends after diode D1 connects with simulation Constant Current Load circuit.
3. the slow constant current electronic load that starts of band according to claim 1 is characterized in that: also comprise the power down quick discharging circuit, be connected across the input end of voltage-stabilizing output circuit and the output terminal of the delayed startup circuit that powers between.
4. the slow constant current electronic load that starts of band according to claim 3; It is characterized in that: comprise that also anti-stop polarity meets anti-diode D1; This diode D1 connects with simulation Constant Current Load circuit, and said load inserts terminal V+V-and connects the two ends after diode D1 connects with simulation Constant Current Load circuit.
5. according to the slow constant current electronic load that starts of each described band of claim 1 to 4; It is characterized in that: the said delayed startup circuit that powers on also comprises resistance R 2, R4, and the reference voltage of reference voltage circuit output is imported the reference voltage input of simulation Constant Current Load circuit after resistance R 2, R4 dividing potential drop.
6. the slow constant current electronic load that starts of band according to claim 5 is characterized in that: said resistance R 4 is adjustable resistance.
7. according to claim 3 or the slow constant current electronic load that starts of 4 described bands; It is characterized in that: said power down quick discharging circuit comprises resistance R 3, R8, R9, R10 and NPN triode Q2, Q3; The input voltage V1 of simulation Constant Current Load circuit incoming end L1L2 is through resistance R 8, R10 dividing potential drop; Between the base stage and emitter of input triode Q3; Also between the base stage and emitter of resistance R 9 input triode Q2, the collector of triode Q3 connects the base stage of triode Q2 to input voltage V1 of this simulation Constant Current Load circuit incoming end L1L2, and the collector of triode Q2 is through the Connect Power output terminal of delayed startup circuit of resistance R 3.
8. the slow constant current electronic load that starts of band according to claim 7, it is characterized in that: said power down quick discharging circuit also comprises the stabilivolt D3 with resistance R 8 series connection.
9. the slow constant current electronic load that starts of band according to claim 8, it is characterized in that: said power down quick discharging circuit also comprises the capacitor C 7 with resistance R 10 parallel connections.
10. the slow constant current electronic load that starts of band according to claim 7, it is characterized in that: said power down quick discharging circuit also comprises the capacitor C 7 with resistance R 10 parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120485855 CN202330674U (en) | 2011-11-25 | 2011-11-25 | Constant-current electronic load with soft start |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120485855 CN202330674U (en) | 2011-11-25 | 2011-11-25 | Constant-current electronic load with soft start |
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| Publication Number | Publication Date |
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| CN202330674U true CN202330674U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120485855 Expired - Lifetime CN202330674U (en) | 2011-11-25 | 2011-11-25 | Constant-current electronic load with soft start |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675545A (en) * | 2013-12-11 | 2014-03-26 | 广西新未来信息产业股份有限公司 | Silicon carbide rod test machine |
| CN103698717A (en) * | 2013-12-30 | 2014-04-02 | 佛山冠今光电科技有限公司 | Aging testing device for detecting driving performance stability of LED (light-emitting diode) power supply |
| CN103825263A (en) * | 2012-11-16 | 2014-05-28 | 海洋王（东莞）照明科技有限公司 | Voltage-stabilization-source start protection circuit and power-strip test circuit |
| CN105471243A (en) * | 2014-09-12 | 2016-04-06 | 南车株洲电力机车研究所有限公司 | Limitation circuit of starting impact current |
| CN106329898A (en) * | 2015-06-19 | 2017-01-11 | 康普技术有限责任公司 | Rapid discharge circuit and rapid discharge method for soft starting circuit |
| CN112290794A (en) * | 2020-10-30 | 2021-01-29 | 重庆梅安森科技股份有限公司 | Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof |
| CN117031346A (en) * | 2023-07-28 | 2023-11-10 | 深圳凌扬微电子有限公司 | Quick test circuit and device for power supply equipment |
-
2011
- 2011-11-25 CN CN 201120485855 patent/CN202330674U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825263A (en) * | 2012-11-16 | 2014-05-28 | 海洋王（东莞）照明科技有限公司 | Voltage-stabilization-source start protection circuit and power-strip test circuit |
| CN103675545A (en) * | 2013-12-11 | 2014-03-26 | 广西新未来信息产业股份有限公司 | Silicon carbide rod test machine |
| CN103698717A (en) * | 2013-12-30 | 2014-04-02 | 佛山冠今光电科技有限公司 | Aging testing device for detecting driving performance stability of LED (light-emitting diode) power supply |
| CN103698717B (en) * | 2013-12-30 | 2017-01-25 | 佛山冠今光电科技有限公司 | Aging testing device for detecting driving performance stability of LED (light-emitting diode) power supply |
| CN105471243A (en) * | 2014-09-12 | 2016-04-06 | 南车株洲电力机车研究所有限公司 | Limitation circuit of starting impact current |
| CN106329898A (en) * | 2015-06-19 | 2017-01-11 | 康普技术有限责任公司 | Rapid discharge circuit and rapid discharge method for soft starting circuit |
| CN112290794A (en) * | 2020-10-30 | 2021-01-29 | 重庆梅安森科技股份有限公司 | Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof |
| CN112290794B (en) * | 2020-10-30 | 2021-10-26 | 重庆梅安森科技股份有限公司 | Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof |
| CN117031346A (en) * | 2023-07-28 | 2023-11-10 | 深圳凌扬微电子有限公司 | Quick test circuit and device for power supply equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |