CN104655890A - Electronic load control protection circuit of charger - Google Patents
Electronic load control protection circuit of charger Download PDFInfo
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- CN104655890A CN104655890A CN201510090797.3A CN201510090797A CN104655890A CN 104655890 A CN104655890 A CN 104655890A CN 201510090797 A CN201510090797 A CN 201510090797A CN 104655890 A CN104655890 A CN 104655890A
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Abstract
An embodiment of the invention provides an electronic load control protection circuit of a charger, and effectively solves the problem of lower effective electric power utilization rate during using of load in the prior art. The electronic load control protection circuit of the charger comprises a sensor signal value control circuit, a direct-voltage limiting point control circuit, a soft start protection circuit and an alternating current output constant-power adjusting circuit, wherein the sensor signal value control circuit is used for controlling current by adjusting the sensor range; the direct-voltage limiting point control circuit is used for controlling voltage to keep balance; the soft start protection circuit is used for controlling a drive duty ratio to linearly increase during starting of the load; the alternating current output constant-power adjusting circuit is used for controlling constant-power output; the sensor signal value control circuit, the soft start protection circuit and the alternating current output constant-power adjusting circuit are connected with the direct-voltage limiting point control circuit. The electronic load control protection circuit of the charger has simple structure and ingenious design, is matched with the charging feathers of the charger very well, remarkably increases the utilization rate of the electric power, and is convenient to implement and easy to popularize and apply.
Description
Technical field
The present invention relates to control technology field, in particular to a kind of charging set electronic load control protection electric circuit.
Background technology
Electronic load or the load of common heating luminous formula are the equipment being consumed electric energy by dissipated power, be widely used in every field, designer finds after deliberation, when using electronic load, in a lot of situation, effective utilization rate of electrical is lower, such as: when being used to carry out charging set burn-in test, because electric automobile battery charger power is large, conventional electronic load power is less, the characteristic of the high-tension high-power of electric automobile battery charger can not be adapted to, when particularly charging set is operated in limited current state, conventional constant current electronic load cannot match, if increasing electronic load current, constant voltage source is made to be in limited current state, two electric currents are all in adjustment, because volt-ampere characteristic is linear unlike resistive load, can output voltage draw very low, make power drop a lot, the effect that perfect condition peak power is aging cannot be reached.
Summary of the invention
In view of this, the object of the embodiment of the present invention is to provide a kind of charging set electronic load control protection electric circuit, when using electronic load to improve in prior art, and the problem that effective utilization rate of electrical is lower.
To achieve these goals, the technical scheme of embodiment of the present invention employing is as follows:
First aspect, embodiments provide a kind of charging set electronic load control protection electric circuit, comprise for the sensor signal size control circuit by regulating transducer range to control size of current, the DC voltage pressure limiting point control circuit of balance is kept for control voltage, for the soft start protection circuit driving dutycycle linearly to increase in load startup control system, and for controlling the interchange output constant power regulating circuit of constant power output;
Described sensor signal size control circuit, described soft start protection circuit are all connected with described DC voltage pressure limiting point control circuit with the described output constant power regulating circuit that exchanges.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, wherein, described sensor signal size control circuit comprises current sensor HR, emitter is connected with described current sensor HR by resistance R72, the triode Q11 of grounded collector, the series connection bleeder circuit be connected with the base stage of described triode Q11, described DC voltage pressure limiting point control circuit is connected with described current sensor HR.
In conjunction with the first possible embodiment of first aspect, embodiments provide the embodiment that the second of first aspect is possible, wherein, described series connection bleeder circuit comprises the potentiometer VR4 that moving contact is connected with the base stage of described triode Q11, be connected to the divider resistance R70 between one of them fixed contact of described potentiometer VR4 and described current sensor HR, be connected to the divider resistance R67B between another fixed contact of described potentiometer VR4 and described current sensor HR.
In conjunction with the embodiment that the second of first aspect is possible, embodiments provide the third possible embodiment of first aspect, wherein, described sensor signal size control circuit also comprises that one end is connected between described resistance R72 and described current sensor HR, the other end is by the resistance R75 of potentiometer VR5 ground connection.
In conjunction with first aspect, embodiments provide the 4th kind of possible embodiment of first aspect, wherein, described DC voltage pressure limiting point control circuit comprises operational amplifier U3, the multiplier U4 that input end is connected with described operational amplifier U3, the operational amplifier U2 that in-phase input end is connected with described multiplier U4, the Sine Pulse Width Modulation control chip U1 that input end is connected with the output terminal of described operational amplifier U2, and the voltage attenuation circuit to be connected with described operational amplifier U3, described sensor signal size control circuit is connected with the inverting input of described operational amplifier U2, described soft start protection circuit and described operational amplifier U3, described multiplier U4 is all connected with described SPWM control chip U1, described interchange output constant power regulating circuit is all connected with described operational amplifier U2 with described multiplier U4.
In conjunction with the 4th kind of possible embodiment of first aspect, embodiments provide the 5th kind of possible embodiment of first aspect, wherein, described voltage attenuation circuit comprises the potentiometer VR3 that moving contact is connected with the input end of described operational amplifier U3, another fixed contact ground connection of the divider resistance R27 be connected with one of them fixed contact of described potentiometer VR3, described potentiometer VR3.
In conjunction with the 4th kind of possible embodiment of first aspect, embodiments provide the 6th kind of possible embodiment of first aspect, wherein, described soft start protection circuit comprises emitter and is connected with the input end of described operational amplifier U3, the triode Q2 of grounded collector, base stage is connected with the base stage of described triode Q2, emitter is connected with the input end of described multiplier U4, the triode Q3 of grounded collector, the base stage of collector and described triode Q2, the base stage of described triode Q3 is all connected with the input end of described SPWM control chip U1, the triode Q1 of grounded emitter, one end is connected with the collector of described triode Q1, the electric capacity C3 of other end ground connection.
In conjunction with the 4th kind of possible embodiment of first aspect, embodiments provide the 7th kind of possible embodiment of first aspect, wherein, described interchange output constant power regulating circuit comprises the operational amplifier U9 that input end is connected with the input end of described multiplier U4, base stage is connected with the output terminal of described operational amplifier U9, the triode Q4 of grounded collector, and the emitter of described triode Q4 is connected with the inverting input of described operational amplifier U2 by resistance R56.
In conjunction with the 7th kind of possible embodiment of first aspect, embodiments provide the 8th kind of possible embodiment of first aspect, wherein, described interchange output constant power regulating circuit also comprises the electric capacity C2 between input end and ground being connected to described operational amplifier U9, is connected to the resistance R1 between the input end of described multiplier U4 and ground.
In conjunction with the 4th kind ~ the 8th kind any one possible embodiment of first aspect, embodiments provide the 9th kind of possible embodiment of first aspect, wherein, the input end of described multiplier U4 is connected with civil power by isolating amplifier circuit G.
In the embodiment of the present invention; be provided with sensor signal size control circuit, soft start protection circuit dexterously, exchange output constant power regulating circuit and DC voltage pressure limiting point control circuit; several circuit cooperatively interacts and ensure that charging set and electronic load perfect cooperation; as when charging set is in limited current state, output voltage can not decline a lot; decline a bit reaches equilibrium point and namely stops; and then the peak power making charging set be under limited current state is aging, significantly improves utilization rate of electrical.
Further; in the embodiment of the present invention; ingehious design has been carried out to the circuit structure of sensor signal size control circuit, soft start protection circuit, interchange output constant power regulating circuit and DC voltage pressure limiting point control circuit; using less components and parts to achieve, utilization rate of electrical is maximized ensure that circuit reliability of operation, realistic demand simultaneously.
Further; charging set electronic load control protection electric circuit structure in the embodiment of the present invention is simple, enforcement is convenient, can significantly improve utilization rate of electrical, safe reliability, realistic demand; there is outstanding substantive distinguishing features and marked improvement, be applicable to large-scale promotion application.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the embodiment of the present invention.The object of the embodiment of the present invention and other advantages are by realizing at write instructions, claims and accompanying drawing and obtaining.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
The structured flowchart of a kind of charging set electronic load control protection electric circuit that Fig. 1 provides for the embodiment of the present invention;
The circuit diagram of a kind of sensor signal size control circuit that Fig. 2 provides for the embodiment of the present invention;
The circuit diagram of a kind of DC voltage pressure limiting point control circuit that Fig. 3 provides for the embodiment of the present invention;
The circuit diagram of a kind of soft start protection circuit that Fig. 4 provides for the embodiment of the present invention;
A kind of circuit diagram exchanging output constant power regulating circuit that Fig. 5 provides for the embodiment of the present invention;
The circuit diagram of a kind of charging set electronic load control protection electric circuit that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Embodiment
Electric automobile battery charger power is usually between 8KW ~ 50KW, because power is larger, needs very big current when enterprise carries out burn-in test before dispatching from the factory, when there being big current to pass through, electric wire and each equipment can produce larger heat, make aging chamber temperature higher, not only waste electric energy but also dangerous, and the electronic load of routine often power is less, the characteristic of the high-tension high-power of electric automobile battery charger can not be adapted to, particularly charging set will be operated in limited current state, conventional constant current electronic load cannot be mated, if electronic load high current, constant voltage source so can be made to be in limited current state, two equipment regulate electric current simultaneously, output voltage draw very low, make power drop a lot, do not reach the effect that perfect condition peak power is aging, cause great waste.
Based on this, as shown in Figure 1, embodiments provide a kind of charging set electronic load control protection electric circuit, comprise for the sensor signal size control circuit 100 by regulating transducer range to control size of current, the DC voltage pressure limiting point control circuit 101 of balance is kept for control voltage, for the soft start protection circuit 103 driving dutycycle linearly to increase in load startup control system, and for controlling the interchange output constant power regulating circuit 102 of constant power output; Described sensor signal size control circuit 100, described soft start protection circuit 103 are all connected with described DC voltage pressure limiting point control circuit 101 with the described output constant power regulating circuit 102 that exchanges.
In above-mentioned, the specific implementation of each circuit has multiple, and provide wherein a kind of in the embodiment of the present invention, in the present embodiment, the implementation of each circuit includes but not limited to under type.
As shown in Figure 2, embodiments provide the realizing circuit of wherein a kind of sensor signal size control circuit 100, described sensor signal size control circuit 100 comprises current sensor HR, emitter is connected with described current sensor HR by resistance R72, the triode Q11 of grounded collector, the series connection bleeder circuit be connected with the base stage of described triode Q11, described DC voltage pressure limiting point control circuit 101 is connected with described current sensor HR.
Wherein, described series connection bleeder circuit comprises the potentiometer VR4 that moving contact is connected with the base stage of described triode Q11, be connected to the divider resistance R70 that one of them fixed contact of described potentiometer VR4 and described current sensor HR power between+15V, be connected to the divider resistance R67B that another fixed contact of described potentiometer VR4 and described current sensor HR power between-15V.
Based on foregoing circuit structure, sensor signal size control circuit 100 to realize principle as follows:
Divider resistance R70, potentiometer VR4 and divider resistance R67B composition series connection bleeder circuit, respective resistance selection has multiple, such as: the suitable resistance choosing divider resistance R70, potentiometer VR4 and divider resistance R67B, make the central point voltage of potentiometer VR4 to about+5V about-0.7V, to make the emitter voltage of triode Q11 at about 0 ~ 5.7V.Because current sensor HR is current mode, induced voltage and additional pull-up resistor have relation, load current is little, induced voltage is just little, the electric current flowing through resistance R72 is larger, the current signal amplitude induced is larger, under changing resistance R72, terminal voltage also just changes the electric current flowing through resistance R72, under resistance R72, terminal voltage is higher, the voltage of resistance R72 upper end is higher, resistance R72 resistance is constant, by changing the voltage of resistance R72 lower end thus controlling the voltage swing that current sensor HR induces.Indirectly also just change the range of current sensor HR, thus the size of cut-off current can be controlled easily, thus control watt level.According to U=IR, when triode Q11 base voltage is at more than 5.6V, the maximum induced voltage of current sensor HR equals I* (R75+VR5), triode Q11 launch very 0V time, the minimum induced voltage of current sensor HR is (R75+VR5) * R72/ (R72+VR5+R72).
During enforcement, preferably triode Q11 is connected into common collector, emitter follower form, the emitter voltage of triode Q11 synchronously changes with base voltage change substantially, when potentiometer VR4 is transferred to bottom, base voltage is about-0.7V, emitter voltage is about 0V, at this time current sensor HR is maximum range, when potentiometer VR4 is transferred to topmost, triode Q11 base voltage will exceed current signal voltage, triode Q11 base voltage due to emitter junction be diode characteristic, base voltage can not channel to current signal end, resistance R72 does not have electric current substantially, do not participate in signal attenuation, the emitter of triode Q11 has Diode Insulation Properties, effectively ensure that the signal that the high voltage of base stage can not have influence on current sensor HR normally exports.
In order to ensure the stability that circuit runs, preferred described sensor signal size control circuit 100 also comprises that one end is connected between described resistance R72 and described current sensor HR, the other end is by the resistance R75 of potentiometer VR5 ground connection.
Wherein, resistance R75 coordinates with potentiometer VR5, can set initial minimum current, makes current sensor HR be in light condition.
As shown in Figure 3, embodiments provide the realizing circuit of wherein a kind of DC voltage pressure limiting point control circuit 101, described DC voltage pressure limiting point control circuit 101 comprises operational amplifier U3, the multiplier U4 that input end is connected with described operational amplifier U3, the operational amplifier U2 that in-phase input end is connected with described multiplier U4, the Sine Pulse Width Modulation control chip U1 that input end is connected with the output terminal of described operational amplifier U2, and the voltage attenuation circuit to be connected with described operational amplifier U3, described sensor signal size control circuit 100 is connected with the inverting input of described operational amplifier U2, described soft start protection circuit 103 and described operational amplifier U3, described multiplier U4 is all connected with described SPWM control chip U1, described interchange output constant power regulating circuit 102 is all connected with described operational amplifier U2 with described multiplier U4.
Wherein, described voltage attenuation circuit comprises the potentiometer VR3 that moving contact is connected with the input end of described operational amplifier U3, the divider resistance R27 be connected with one of them fixed contact of described potentiometer VR3, another fixed contact ground connection of described potentiometer VR3.
Based on foregoing circuit structure, DC voltage pressure limiting point control circuit 101 to realize principle as follows:
Divider resistance R27 and potentiometer VR3 constitutes DC voltage attenuator circuit, signal delivers to the input end VA of multiplier U4 after the process of operational amplifier U3 amplifier, two other input end of multiplier U4 connects city's electro-detection by isolating amplifier circuit G, in general, the output of multiplier U4 equal VA be multiplied by IAC again divided by VRMS square, the output MULT OUT of multiplier U4 receives the in-phase input end of operational amplifier U2, current sensor HR connects the inverting input of operational amplifier U2, and operational amplifier U2 exports the SPWM signal of control SPWM control chip U1.
When input direct voltage is higher than setting value normal range, operational amplifier U3 exports a fixed voltage, fully loaded work, when input direct voltage is lower than setting value, operational amplifier U3 output voltage will by certain slope drop-out voltage, the output voltage amplitude of multiplier U4 is reduced, and then the output amplitude of operational amplifier U2 is also reduced, thus SPWM waveform duty cycle is reduced, output power is reduced, and DC current reduces, this mode, make input direct voltage can not reduce a lot, keep equilibrium state.
As shown in Figure 4, embodiments provide the realizing circuit of wherein a kind of soft start protection circuit 103, described soft start protection circuit 103 comprises emitter and is connected with the input end of described operational amplifier U3, the triode Q2 of grounded collector, base stage is connected with the base stage of described triode Q2, emitter is connected with the input end of described multiplier U4, the triode Q3 of grounded collector, the base stage of collector and described triode Q2, the base stage of described triode Q3 is all connected with the input end of described SPWM control chip U1, the triode Q1 of grounded emitter, one end is connected with the collector of described triode Q1, the electric capacity C3 of other end ground connection.
Based on foregoing circuit structure, soft start protection circuit 103 to realize principle as follows:
The base stage of triode Q1 connects switching on and shutting down signal delivery end, in the power-offstate, triode Q1 is conducting, now electric capacity C3 two ends no-voltage, triode Q2 conducting drags down input direct voltage test side voltage, and triode Q3 conducting drags down test side, the output of multiplier U4 is set low, operational amplifier U2 exports low, and the COMP end of SPWM control chip U1 sets low, and SPWM control chip U1 is without driver output; When after start, triode Q1 ends, electric capacity C3 both end voltage is charged by the inner constant current source of SPWM control chip U1, electric capacity C3 both end voltage is linearly increased by 0V to 5V, when the base voltage of triode Q1 is higher than emitter voltage, triode Q2 and triode Q3 is by being conducting to cut-off, the output terminal of multiplier U4 is slowly increased by 0V, the COMP terminal voltage of SPWM control chip U1 also slowly increases, thus the driving dutycycle realizing control SPWM control chip U1 slowly strengthens, and plays the effect of soft start.
Empirical tests; if do not add soft start protection circuit 103; so under off-mode; the output of multiplier U4 is high level always; the SOFT/START pin soft start effect depending merely on SPWM control chip U1 is bad; the driving dutycycle of SPWM control chip U1 is not increased by minimal linear; easy impulse interference wave switch pipe; when making to start, switching tube transformer stress is large; easy burning pipe, through test comparison, adds when soft start protection circuit 103 starts and does not substantially have sound; drive waveforms is linearly increased by 0V balance and stability, and failure rate is extremely low.
As shown in Figure 5, embodiments provide wherein a kind of realizing circuit exchanging output constant power regulating circuit 102, described interchange output constant power regulating circuit 102 comprises the operational amplifier U9 that input end is connected with the input end of described multiplier U4, base stage is connected with the output terminal of described operational amplifier U9, the triode Q4 of grounded collector, and the emitter of described triode Q4 is connected with the inverting input of described operational amplifier U2 by resistance R56.
In order to ensure the stability that circuit runs, preferred described interchange output constant power regulating circuit 102 also comprises the electric capacity C2 between input end and ground being connected to described operational amplifier U9, is connected to the resistance R1 between the input end of described multiplier U4 and ground.
Based on foregoing circuit structure, exchange output constant power regulating circuit 102 to realize principle as follows:
Line voltage is processed into the voltage mated with current sensor HR by operational amplifier U9, when line voltage is low, the complete conducting of triode Q4, the electric current flowing through resistance R56 is maximum, makes ac output current alternating current when line voltage is lower maximum, AC power is kept not diminish, when line voltage height, triode Q4 ends, and no current flows through resistance R56, alternating current is diminished, keeps the invariable power exchanged.
Empirical tests, exchanges output constant power regulating circuit 102 if do not added, so when line voltage deviation height changes, AC power will change, and when line voltage is low, AC power is little, when line voltage height, output power is large, is unfavorable for the steady operation of electronic load.
When implementing, the input end of preferred multiplier U4 is connected with civil power by isolating amplifier circuit G.
By carrying out ingehious design to the circuit structure of sensor signal size control circuit 100, soft start protection circuit 103, interchange output constant power regulating circuit 102 and DC voltage pressure limiting point control circuit 101; less components and parts are used to ensure that circuit reliability of operation; achieve the maximization of utilization rate of electrical, realistic demand.
As shown in Figure 6, the connection diagram of wherein a kind of sensor signal size control circuit 100, soft start protection circuit 103, interchange output constant power regulating circuit 102 and DC voltage pressure limiting point control circuit 101 is additionally provided in the embodiment of the present invention.
In the embodiment of the present invention; be provided with sensor signal size control circuit 100, soft start protection circuit 103 dexterously, exchange output constant power regulating circuit 102 and DC voltage pressure limiting point control circuit 101; several circuit cooperatively interacts and ensure that charging set and electronic load perfect matching; as when charging set is in limited current state, output voltage can not decline a lot; decline a bit reaches equilibrium point and namely stops; and then the peak power making charging set be under limited current state is aging, significantly improves utilization rate of electrical.
On the basis of foregoing circuit, part auxiliary circuit, components and parts and line is also connected with in the embodiment of the present invention, for ensureing the normal operation of circuit, the use of these auxiliary circuits and components and parts belongs to the circuit application custom of industry universal, and be this area comparatively proven technique, do not repeat them here.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (10)
1. a charging set electronic load control protection electric circuit, it is characterized in that, comprise for the sensor signal size control circuit by regulating transducer range to control size of current, the DC voltage pressure limiting point control circuit of balance is kept for control voltage, for the soft start protection circuit driving dutycycle linearly to increase in load startup control system, and for controlling the interchange output constant power regulating circuit of constant power output;
Described sensor signal size control circuit, described soft start protection circuit are all connected with described DC voltage pressure limiting point control circuit with the described output constant power regulating circuit that exchanges.
2. charging set electronic load control protection electric circuit according to claim 1; it is characterized in that; described sensor signal size control circuit comprises current sensor HR; emitter is connected with described current sensor HR by resistance R72, the triode Q11 of grounded collector; the series connection bleeder circuit be connected with the base stage of described triode Q11, described DC voltage pressure limiting point control circuit is connected with described current sensor HR.
3. charging set electronic load control protection electric circuit according to claim 2; it is characterized in that; described series connection bleeder circuit comprises the potentiometer VR4 that moving contact is connected with the base stage of described triode Q11; be connected to the divider resistance R70 between one of them fixed contact of described potentiometer VR4 and described current sensor HR, be connected to the divider resistance R67B between another fixed contact of described potentiometer VR4 and described current sensor HR.
4. charging set electronic load control protection electric circuit according to claim 3; it is characterized in that, described sensor signal size control circuit also comprises that one end is connected between described resistance R72 and described current sensor HR, the other end is by the resistance R75 of potentiometer VR5 ground connection.
5. charging set electronic load control protection electric circuit according to claim 1, it is characterized in that, described DC voltage pressure limiting point control circuit comprises operational amplifier U3, the multiplier U4 that input end is connected with described operational amplifier U3, the operational amplifier U2 that in-phase input end is connected with described multiplier U4, the Sine Pulse Width Modulation control chip U1 that input end is connected with the output terminal of described operational amplifier U2, and the voltage attenuation circuit to be connected with described operational amplifier U3, described sensor signal size control circuit is connected with the inverting input of described operational amplifier U2, described soft start protection circuit and described operational amplifier U3, described multiplier U4 is all connected with described SPWM control chip U1, described interchange output constant power regulating circuit is all connected with described operational amplifier U2 with described multiplier U4.
6. charging set electronic load control protection electric circuit according to claim 5; it is characterized in that; described voltage attenuation circuit comprises the potentiometer VR3 that moving contact is connected with the input end of described operational amplifier U3; another fixed contact ground connection of the divider resistance R27 be connected with one of them fixed contact of described potentiometer VR3, described potentiometer VR3.
7. charging set electronic load control protection electric circuit according to claim 5, it is characterized in that, described soft start protection circuit comprises emitter and is connected with the input end of described operational amplifier U3, the triode Q2 of grounded collector, base stage is connected with the base stage of described triode Q2, emitter is connected with the input end of described multiplier U4, the triode Q3 of grounded collector, the base stage of collector and described triode Q2, the base stage of described triode Q3 is all connected with the input end of described SPWM control chip U1, the triode Q1 of grounded emitter, one end is connected with the collector of described triode Q1, the electric capacity C3 of other end ground connection.
8. charging set electronic load control protection electric circuit according to claim 5; it is characterized in that; described interchange output constant power regulating circuit comprises the operational amplifier U9 that input end is connected with the input end of described multiplier U4; base stage is connected with the output terminal of described operational amplifier U9, the triode Q4 of grounded collector, and the emitter of described triode Q4 is connected with the inverting input of described operational amplifier U2 by resistance R56.
9. charging set electronic load control protection electric circuit according to claim 8; it is characterized in that; described interchange output constant power regulating circuit also comprises the electric capacity C2 between input end and ground being connected to described operational amplifier U9, is connected to the resistance R1 between the input end of described multiplier U4 and ground.
10. the charging set electronic load control protection electric circuit according to claim 5 ~ 9 any one, is characterized in that, the input end of described multiplier U4 is connected with civil power by isolating amplifier circuit G.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510090797.3A CN104655890B (en) | 2015-02-28 | 2015-02-28 | Charger electronic load control protection electric circuit |
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| CN201510090797.3A CN104655890B (en) | 2015-02-28 | 2015-02-28 | Charger electronic load control protection electric circuit |
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| CN104655890A true CN104655890A (en) | 2015-05-27 |
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| CN106253887A (en) * | 2016-07-28 | 2016-12-21 | 苏州律力电子科技有限公司 | A kind of soft start switch Circuits System |
| CN116880639A (en) * | 2023-09-07 | 2023-10-13 | 广东东菱电源科技有限公司 | Circuit and method for realizing constant power by using triode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253887A (en) * | 2016-07-28 | 2016-12-21 | 苏州律力电子科技有限公司 | A kind of soft start switch Circuits System |
| CN116880639A (en) * | 2023-09-07 | 2023-10-13 | 广东东菱电源科技有限公司 | Circuit and method for realizing constant power by using triode |
| CN116880639B (en) * | 2023-09-07 | 2023-11-24 | 广东东菱电源科技有限公司 | Circuit for realizing constant power by using triode and constant power method |
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| CN104655890B (en) | 2017-11-24 |
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