CN204376695U - With the power starting circuit of fictitious load and the electronic controller of circuit breaker - Google Patents
With the power starting circuit of fictitious load and the electronic controller of circuit breaker Download PDFInfo
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- CN204376695U CN204376695U CN201420691865.2U CN201420691865U CN204376695U CN 204376695 U CN204376695 U CN 204376695U CN 201420691865 U CN201420691865 U CN 201420691865U CN 204376695 U CN204376695 U CN 204376695U
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Abstract
With the power starting circuit of fictitious load, comprise the voltage monitoring circuit of monitoring power voltage, fictitious load unit and power conversion chip U2; Described voltage monitoring circuit comprises voltage monitoring chip U1, and the input of voltage monitoring circuit is connected with power supply, and the output of voltage monitoring circuit is connected with power conversion chip U2 and fictitious load unit; When the voltage of power supply is less than startup threshold value, voltage monitoring circuit makes power conversion chip U2 not work and the connection of turn-on power and fictitious load unit; When the voltage of power supply is greater than startup threshold values, voltage monitoring circuit makes power conversion chip U2 output services voltage to normal operating load and the connection of cut-off power supply and fictitious load unit.Power starting circuit, by voltage monitoring chip monitoring power supply, starts power-switching circuit, realizes the steady switching of load after power supply really reaches entry condition.The utility model additionally provides the electronic controller of the circuit breaker comprising power starting circuit.
Description
Technical field
The utility model belongs to Low Voltage Electrical Apparatus, relates to a kind of power starting circuit with fictitious load and comprises the electronic controller of circuit breaker of this power starting circuit.
Background technology
Low-voltage circuit breaker current protection mode is initially Thermomagnetic type and electromagnetic type; along with the development of electronic technology; start research and development the nineties in last century and use electronic controller; electronic controller adopts current transformer to export as current sampling signal, and the power supply simultaneously utilizing current transformer to export as electronic trip unit supplies.
But because intelligent moulded case circuit breaker current transformer exports finite energy, power output is lower, so to the low-power consumption of controller circuitry power consumption requirements.And intelligent moulded case circuit breaker substitute be former Thermomagnetic type and electromagnetic type product, require that controller is controlled cost as far as possible, raising intelligent moulded case circuit breaker competitiveness.The minimum cage electric current of intelligent moulded case circuit breaker only has 100A or 125A, so require that controller controls volume as far as possible.
The current sampling circuit of existing electronic controller as shown in Figure 1-2, owing to adopting way of full-wave rectification, and signal is negative signal, oppositely process need be amplified through amplifier, controller is caused to there is following defect and deficiency: 1) because components and parts increase, pcb board fabric swatch area increases, and causes controller volume larger; 2) oppositely amplify process owing to increasing amplifier, cause controller power consumption to increase, the requirement of instrument transformer is increased; 3) because components and parts increase, cause cost to increase, make intelligent moulded case circuit breaker high expensive; 4) owing to adopting full-wave rectification to adopt, earth current cannot be sampled, and controller cannot be grounded defencive function.
And the electronic controller power supply of low-voltage circuit breaker is mainly derived from current transformer, particularly intelligent moulded case circuit breaker, owing to there is no accessory power supply, the power supply guarantee work that current transformer can only be relied on to produce.But because the fluctuation of circuit breaker main circuit current is comparatively large, as large in electric current on daytime, night, electric current was little, made controller power circuit frequent operation in normal and abnormal critical condition, will cause controller job insecurity, occurred the situations such as misoperation, by mistake display.
As shown in Figure 5, existing electronic controller power supply adopts the power starting circuit be made up of resistance, voltage-stabiliser tube, triode usually, namely when input supply voltage Vin is greater than voltage-stabiliser tube DZ1 conducting voltage, triode Q1 conducting, power supply chip U1 Enable Pin EN level is low level, because power supply chip U1 is the enable work of low level, so power supply chip U1 output end vo ut exports the power supply after conversion as+5V ,+3.3V.Backend load RL starts working, because load RL needs certain energy, when front end power supply input Vin energy is less, Vin Voltage Drop will be caused, make supply voltage Vin lower than voltage-stabiliser tube DZ1 conducting voltage, triode Q1 is ended, and power supply chip U1 Enable Pin EN level becomes high level, and stopping exports by power supply chip by output end vo ut.Because backend load loses power supply supply, supply voltage Vin will continue boosted voltage, there is again the situation being greater than voltage-stabiliser tube DZ1 conducting voltage, go round and begin again, so power supply chip U1 is in the periodic duty state opened and close always, electronic controller will be made to be in unstable working state, easily to occur misoperation and miss the faults such as display.
Summary of the invention
The purpose of this utility model is the defect overcoming prior art, provides that a kind of structure is simple, reliability is high, the power starting circuit of band fictitious load of working stability and the electronic controller of circuit breaker.
For achieving the above object, the utility model have employed following technical scheme:
With a power starting circuit for fictitious load, comprise the voltage monitoring circuit 202 of monitoring power voltage, fictitious load unit 203 and power conversion chip U2; Described voltage monitoring circuit 202 comprises voltage monitoring chip U1, and the input of voltage monitoring circuit 202 is connected with power supply, and the output of voltage monitoring circuit 202 is connected with power conversion chip U2 and fictitious load unit 203; When the voltage of power supply is less than startup threshold value, voltage monitoring circuit 202 makes power conversion chip U2 not work and the connection of turn-on power and fictitious load unit 203; When the voltage of power supply is greater than startup threshold values, voltage monitoring circuit 202 makes power conversion chip U2 output services voltage to normal operating load and the connection of cut-off power supply and fictitious load unit 203.
Further, between voltage monitoring circuit 202 and power supply, power supply voltage signal sampling unit 201 is also provided with; Filter unit 204 is provided with between power conversion chip U2 and operating load.
Further, described voltage monitoring chip U1 inside includes Schmidt trigger, after power conversion chip U2 output services voltage to normal operating load, Schmidt trigger trigger voltage monitoring chip U1 adjusts and starts threshold values to release threshold values, and release threshold values is less than startup threshold values.
Further, the load of fictitious load unit 203 is more than or equal to the normal operating load after power initiation.
Further, described fictitious load unit 203 comprises triode Q2 and fictitious load resistance R7, the base stage of triode Q2 is connected with the output VOUT of voltage monitoring chip U1, and collector electrode is connected with the positive pole of power supply through fictitious load resistance R7, and emitter is connected with the negative pole of power supply.
Further, described voltage monitoring circuit 202 also comprises diode Q1 and resistance R5, the base stage of diode Q1 is connected with the output VOUT of voltage monitoring chip U1, collector electrode is connected with the Enable Pin EN of resistance R5 one end and power conversion chip U2, emitter is connected with the negative pole of power supply, the input VIN of power conversion chip U2 is connected with the positive pole of power supply, and the resistance R5 other end is connected with the positive pole of power supply.
Further, the input VIN of power conversion chip U2 is connected with the positive pole of power supply, and earth terminal GND is connected with the negative pole of power supply, and Enable Pin EN is connected with the output VOUT of voltage monitoring chip U1, and the output VOUT of power conversion chip U2 is connected with operating load.
Further, described voltage monitoring circuit 202 also comprises triode Q3, and the base stage of triode Q3 is connected with the output VOUT of voltage monitoring chip U1, and collector electrode is connected with the positive pole of power supply, and emitter is connected with the input VIN of power conversion chip U2.
The utility model additionally provides a kind of electronic controller of circuit breaker, comprises above-mentioned power starting circuit.
Power starting circuit of the present utility model is by voltage monitoring chip monitoring power supply, the load of analogue load circuit analog operation, power-switching circuit is started after power supply really reaches entry condition, fictitious load disconnects simultaneously, realize the steady switching of load, after electronic controller is normally worked, supply voltage can not fall again, thus ensures that electronic controller works in steady-working state.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the current sampling circuit of prior art;
Fig. 2 is the waveform evolution of the current sampling circuit of prior art;
Fig. 3 is the circuit diagram of the utility model New type of current sample circuit;
Fig. 4 is the waveform evolution of the utility model New type of current sample circuit;
Fig. 5 is the circuit diagram of the power starting circuit of prior art;
Fig. 6 is power starting circuit embodiment one circuit diagram of the present utility model;
Fig. 7 is power starting circuit embodiment two circuit diagram of the present utility model;
Fig. 8 is power starting circuit embodiment three-circuit figure of the present utility model.
Embodiment
Below in conjunction with the embodiment that accompanying drawing 1 to 8 provides, further illustrate the embodiment of electronic controller of the present utility model.Electronic controller of the present utility model is not limited to the description of following examples.
As shown in Figure 3-4, a kind of electronic controller of intelligent moulded case circuit breaker, comprise the New type of current sample circuit of half-wave sampling, described New type of current sample circuit comprises the current transformer interface 101, rectification unit 102, half-wave current change-over circuit 103 and the signal lifting circuit 104 that are connected with current transformer.The current transformer of electronic controller is connected with the current transformer interface 101 of New type of current sample circuit, the microcontroller of electronic controller is connected with signal lifting circuit 104, and rectification unit 102 connects and is connected for electronic controller is powered with the power circuit of electronic controller.Current transformer interface 101 is connected with the current transformer of electronic controller and obtains current sampling signal, rectification unit 102 is connected with current transformer interface 101 and carries out rectification to current sampling signal, and rectification unit 102 and electronic controller power circuit be connected out-put supply VDD and power to electronic controller, half-wave current change-over circuit 103 is connected with rectification unit 102 and current sampling signal is converted to voltage signal and half-wave samples, signal lifting circuit 104 is connected the voltage signal sampled by half-wave and is positive signal through lifting reference voltage V ref lifting and exports to the ADC Sampling Interface of the microprocessor of electronic controller with half-wave current change-over circuit 103.
The sample mode of current signal is sampled by all-wave and is changed half-wave sampling into by New type of current sample circuit of the present utility model, and cancel the mode of amplifier amplification, change to the mode of direct lifting on the basis of reference voltage, controller power consumption can be reduced like this, reduce costs, reduced volume.Particularly be suitable for the current sampling circuit of the electronic controller for breaker of plastic casing, can effectively reduce electronic controller volume and cost.
The intelligent moulded case circuit breaker of the present embodiment is four-pole circuit breaker, has four current transformers, and LA, LB, LC, LN are the input of four current transformers.Described current transformer interface 101 comprises five inputs that can be connected with four current transformers, wherein four inputs of current transformer interface 101 are connected with a signal input part of four current transformers respectively, and the 5th input is connected with another signal input part of four current transformers simultaneously.If three-pole breaker, also can only have LA, LB, LC input of No. tri-current transformer, current transformer interface 101 can only have four inputs.
Described rectification unit 102 comprises rectifier diode D101 ~ D110, and the rectifier diode of rectification unit 102 can be single only encapsulation, and also can be many encapsulation, the rectification unit 102 of the present embodiment be for there being the way of full-wave rectification of common port.Half-wave current change-over circuit 103 comprises sample resistance R101 ~ R105, current signal is converted to voltage signal by sample resistance, sample of signal only carries out half-wave sampling, resistance R101 ~ R104 is LA, LB, LC, LN tetra-sample resistance of pole signal, R105 be four polar vectors and sample resistance (for earth current sampling).Signal lifting circuit 104 comprises resistance R201 ~ R210, and current signal, through the lifting of electric resistance partial pressure and lifting reference voltage V ref, makes signal become positive signal from negative signal, then is input to the ADC Sampling Interface of microprocessor.
Described rectification unit 102 comprises five commutator unit, and each commutator unit includes two rectifier diodes, and rectifier diode D101 ~ D110 forms five commutator unit; Described half-wave current change-over circuit 103 comprises five half-wave current conversion sub-circuit, and each half-wave current conversion sub-circuit includes a sample resistance, and sample resistance R101 ~ R105 forms five half-wave current conversion sub-circuit; Described signal lifting circuit comprises five signal lifting electronic circuits, and each signal lifting electronic circuit includes two resistance, and resistance R201 ~ R210 forms five signal lifting electronic circuits.Five inputs of current transformer interface 101 are connected with five commutator unit respectively, one end of five commutator unit connects together and is connected with power circuit afterwards, the other end of five commutator unit is connected with one end of five half-wave current conversion sub-circuit respectively, be connected with one end of five signal lifting electronic circuits respectively, the other end of five half-wave current conversion sub-circuit connects together rear ground connection simultaneously; The other end of five signal lifting electronic circuits connects together and is connected with lifting reference voltage V ref afterwards; Five signal lifting electronic circuits have five outputs that can be connected with microprocessor; Five input lists can be connected with five pins of the ADC Sampling Interface of microprocessor respectively.Certainly, if the quantity of three-pole breaker then each electronic circuit can be four.
The concrete connection of New type of current sample circuit as shown in Figure 3, is described with the circuit of a road sampled signal of the signal input part LA of current transformer.The negative pole of rectifier diode D106 is connected with the positive pole of rectifier diode D101, rectifier diode D106 is connected with a signal input part of the signal input part LA of current transformer with the tie point of rectifier diode D101, and the negative pole of rectifier diode D101 is connected with power circuit; The positive pole of rectifier diode D106 connects with corresponding sample resistance R101 one end, and rectifier diode D106 is connected with corresponding resistance R209 one end with the tie point of sample resistance R101, the other end ground connection of sample resistance R101; The other end of resistance R209 is connected with resistance R210 one end, the tie point of resistance R209 and resistance R210 and microprocessor pin AD_IA be connected and export sampled signal, the other end of resistance R210 is connected with lifting reference voltage V ref.
This signal input part of the signal input part LA of current transformer is set to the first monitoring point UA1, the tie point of rectifier diode D106 and sample resistance R101 is set to the second monitoring point UA2, the tie point of resistance R209 and resistance R210 is set to the 3rd monitoring point UA3, LA phase current waveform evolution process can be obtained.LA phase current waveform evolution process as shown in Figure 4.
The rectification circuit of New type of current sample circuit of the present utility model adopts independently diode to carry out connecting and sample resistance connects rectification publicly after being serially connected with the anode of rectifier diode, sample resistance voltage signal is through the direct lifting of reference voltage, and the A/D adopting the mode of electric resistance partial pressure to enter microcontroller changes mouth.Adopt half-wave sampling to replace all-wave sampling, adopt the mode of signal direct lifting to replace amplifier oppositely to amplify, low in energy consumption, components and parts are few, cost is low, volume is little, can reduce the cost of electronic controller for breaker, reduce the volume of controller.
As shown in Fig. 3,6-8, the power circuit of electronic controller of the present utility model is provided with the power starting circuit of band fictitious load, and power starting circuit comprises the voltage monitoring circuit 202 of monitoring power voltage, fictitious load unit 203 and power conversion chip U2; Described voltage monitoring circuit 202 comprises voltage monitoring chip U1, and the input of voltage monitoring circuit 202 is connected with power supply, and the output of voltage monitoring circuit 202 is connected with power conversion chip U2 and fictitious load unit 203; When the voltage of power supply is less than startup threshold value, the connection of voltage monitoring circuit 202 turn-on power and fictitious load unit 203, the connection of cut-off power supply and power conversion chip U2; When the voltage of power supply is greater than startup threshold values, voltage monitoring circuit 202 ends the connection of power supply and fictitious load unit 203, the connection of turn-on power and power conversion chip U2.Preferably, between voltage monitoring circuit 202 and power supply, power supply voltage signal sampling unit 201 is also provided with; Filter unit 204 is provided with between power conversion chip U2 and operating load.Power starting circuit of the present utility model is by voltage monitoring chip monitoring power supply, the load of analogue load circuit analog operation, power-switching circuit is started after power supply really reaches entry condition, fictitious load disconnects simultaneously, realize the steady switching of load, after electronic controller is normally worked, supply voltage can not fall again, thus ensures that electronic controller works in steady-working state.
As shown in Figure 6, the embodiment one of the power starting circuit of the utility model band fictitious load, described power supply voltage signal sampling unit 201 comprises the resistance R1 between positive pole (Vin+ end) and negative pole (Vin-end) and resistance R2 that are connected in series in power supply, voltage monitoring circuit 202 comprises voltage monitoring chip U1, resistance R3, resistance R4, resistance R5 and triode Q1, described fictitious load unit 203 comprises resistance R6, triode Q2 and fictitious load resistance R7, and filter unit 204 comprises electric capacity C1, electric capacity C2.Resistance R1 is connected with the input VDD of voltage monitoring chip U1 with the tie point of resistance R2, the input VSS of voltage monitoring chip U1 is connected with the negative pole of power supply, resistance R3 one end is connected with the positive pole of power supply, and the output VOUT of the other end and resistance R4 one end, resistance R6 one end and voltage monitoring chip U1 is connected; The resistance R4 other end is connected with the base stage of diode Q1, the collector electrode of diode Q1 is connected with the Enable Pin EN of resistance R5 one end and power conversion chip U2, emitter is connected with the negative pole of power supply, the input VIN of power conversion chip U2 is connected with the positive pole of power supply, and the resistance R5 other end is connected with the positive pole of power supply; The other end of resistance R6 is connected with the base stage of triode Q2, and the collector electrode of triode Q2 is connected with the positive pole of power supply through fictitious load resistance R7, and emitter is connected with the negative pole of power supply.The earth terminal GND of power conversion chip U2 is connected with the negative pole of power supply, the output VOUT of power conversion chip U2 is through filter unit 204 output services voltage, electric capacity C1, electric capacity C2 and resistance RL are in parallel, one end in parallel is connected with the output VOUT of power conversion chip U2, and the other end is connected with the negative pole of power supply.
In the present embodiment, the Enable Pin EN of power conversion chip U2 is the enable work of low level, and when Enable Pin EN is high level, power conversion chip U2 output VOUT exports closedown, exports without working power.The start-up course of the power starting circuit of the present embodiment is as follows, and power supply voltage signal sampling unit 201 pairs of supply voltages carry out dividing potential drop sampling, and the voltage signal that electric resistance partial pressure drives is input to voltage monitoring chip U1 input VDD.When the voltage signal of input VDD is less than the startup threshold values of voltage monitoring inside, voltage monitoring chip U1 output end vo ut output low level, triode Q1 not conducting, the Enable Pin EN of power conversion chip U2 is made to be high level, because power conversion chip U2 is the enable work of low level, close so power conversion chip U2 output end vo ut exports, non-transformer exports; Meanwhile, the triode Q2 conducting in fictitious load unit 203, makes fictitious load resistance R7 be in "on" position.When the voltage signal of input VDD is greater than voltage monitoring inside startup threshold values, voltage monitoring chip U1 output end vo ut exports high level, triode Q1 conducting, power conversion chip U2 Enable Pin EN is made to be low level, because power conversion chip U2 is the enable work of low level, so power conversion chip U2 output end vo ut exports open-minded, out-put supply operating voltage Vout, operating voltage Vout output to normal load RL after filter unit 204 filtering; Meanwhile, the triode Q2 in fictitious load unit 203 ends, and make fictitious load resistance R7 be in no power state, power source loads is steadily switched to normal load RL by fictitious load R7.And, described voltage monitoring chip U1 inside includes Schmidt trigger, after normal load RL work, Schmidt trigger trigger voltage monitoring chip U1 automatically adjusts and starts threshold values to release threshold values, and release threshold values is less than startup threshold values, backend load unit is normally worked, there will not be the phenomenon that power supply energy deficiency makes power conversion chip U2 repeatedly start.
As shown in Figure 7, the embodiment two of the power starting circuit of the utility model band fictitious load, the difference of the present embodiment and embodiment one is, the Enable Pin EN of power conversion chip U2 is the enable work of high level, when Enable Pin EN is low level, power conversion chip U2 output VOUT exports closedown, exports without working power.Therefore the voltage monitoring circuit 202 of the present embodiment comprises voltage monitoring chip U1, resistance R3, eliminates triode Q1.Resistance R1 is connected with the input VDD of voltage monitoring chip U1 with the tie point of resistance R2, the input VSS of voltage monitoring chip U1 is connected with the negative pole of power supply, resistance R3 one end is connected with the positive pole of power supply, and the other end is connected with the output VOUT of resistance R6 one end and voltage monitoring chip U1; The Enable Pin EN of power conversion chip U2 is connected with the output VOUT of voltage monitoring chip U1, and input VIN is connected with the positive pole of power supply, and earth terminal GND is connected with the negative pole of power supply; The other end of resistance R6 is connected with the base stage of triode Q2, and the collector electrode of triode Q2 is connected with the positive pole of power supply through fictitious load resistance R7, and emitter is connected with the negative pole of power supply.The output VOUT of power conversion chip U2 is through filter unit 204 output services voltage, and electric capacity C1, electric capacity C2 are in parallel, and one end in parallel is connected with the output VOUT of power conversion chip U2, and the other end is connected with the negative pole of power supply.When the voltage signal of input VDD is less than the startup threshold values of voltage monitoring inside, voltage monitoring chip U1 output end vo ut output low level, power conversion chip U2 output end vo ut exports closedown, and non-transformer exports; Triode Q2 conducting, makes fictitious load resistance R7 be in "on" position.When the voltage signal of input VDD is greater than voltage monitoring inside startup threshold values, voltage monitoring chip U1 output end vo ut exports high level, so power conversion chip U2 output end vo ut exports open-minded, and out-put supply operating voltage Vout; Meanwhile, triode Q2 ends, and make fictitious load resistance R7 be in no power state, power source loads is steadily switched to normal load RL by fictitious load R7.And voltage monitoring chip U1 automatically adjusts and starts threshold values to release threshold values, makes backend load unit normally work, there will not be the phenomenon that power supply energy deficiency makes power conversion chip U2 repeatedly start.
As shown in Figure 8, the embodiment three of the power starting circuit of the utility model band fictitious load, the difference of the present embodiment and embodiment one is, power conversion chip U2 makes workable chip for not being with, as long as the input VIN of power conversion chip U2 and positive source conducting then power conversion chip U2 output VOUT export open-minded, out-put supply operating voltage Vout.The voltage monitoring circuit 202 of the present embodiment comprises voltage monitoring chip U1, resistance R3 and triode Q3, resistance R1 is connected with the input VDD of voltage monitoring chip U1 with the tie point of resistance R2, the input VSS of voltage monitoring chip U1 is connected with the negative pole of power supply, resistance R3 one end is connected with the positive pole of power supply, the other end is connected with the output VOUT of resistance R6 one end and voltage monitoring chip U1, the base stage of triode Q3 is connected with the output VOUT of voltage monitoring chip U1, collector electrode is connected with the positive pole of power supply, emitter is connected with the input VIN of power conversion chip U2, the other end of resistance R6 is connected with the base stage of triode Q2, and the collector electrode of triode Q2 is connected with the positive pole of power supply through fictitious load resistance R7, and emitter is connected with the negative pole of power supply.The output VOUT of power conversion chip U2 is through filter unit 204 output services voltage, electric capacity C1 one end is connected the other end with the output VOUT of power conversion chip U2 and is connected with power cathode, and electric capacity C2 one end is connected other end ground connection with the output VOUT of power conversion chip U2.When the voltage signal of input VDD is less than the startup threshold values of voltage monitoring inside, voltage monitoring chip U1 output end vo ut output low level, triode Q3 not conducting, the input VIN non-transformer input of power conversion chip U2, power conversion chip U2 output end vo ut exports closedown, and non-transformer exports; Triode Q2 conducting simultaneously, makes fictitious load resistance R7 be in "on" position.When the voltage signal of input VDD is greater than voltage monitoring inside startup threshold values, voltage monitoring chip U1 output end vo ut exports high level, triode Q3 conducting, the input VIN of power conversion chip U2 obtains electric, power conversion chip U2 output end vo ut exports open-minded, out-put supply operating voltage Vout; Meanwhile, triode Q2 ends, and make fictitious load resistance R7 be in no power state, power source loads is steadily switched to normal load RL by fictitious load R7.And voltage monitoring chip U1 automatically adjusts and starts threshold values to release threshold values, makes backend load unit normally work, there will not be the phenomenon that power supply energy deficiency makes power conversion chip U2 repeatedly start.
Obviously, power starting circuit of the present utility model can not arrange power supply voltage signal sampling unit 201 and filter unit 204.Voltage monitoring chip U1 also can for exporting high level when the voltage signal of input VDD is less than the startup threshold values of voltage monitoring inside, the output low level when the voltage signal of input VDD is greater than the startup threshold values of voltage monitoring inside, other control circuits oppositely adjust corresponding like this.
The utility model increases power starting circuit before the power-switching circuit of electronic controller, and power starting circuit band fictitious load, when power-switching circuit is not opened, fictitious load is always in running order, when circuit breaker current increases, when reaching entry condition, power-switching circuit is open-minded, and fictitious load disconnects simultaneously, realize the steady switching of load, after electronic controller is normally worked, supply voltage can not fall again, thus ensures that electronic controller works in steady-working state.The fictitious load of power starting circuit is more than or equal to the real work load after power initiation, and, described voltage monitoring chip U1 inside includes Schmidt trigger, after normal load work, voltage monitoring chip U1 automatically adjusts and starts threshold values to less release threshold values, backend load unit is normally worked, and the phenomenon that there will not be power supply energy deficiency that power conversion chip U2 is started repeatedly, effectively can improve the reliability of electronic controller.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection range of the present utility model.
Claims (9)
1. the power starting circuit with fictitious load, is characterized in that: comprise the voltage monitoring circuit (202) of monitoring power voltage, fictitious load unit (203) and power conversion chip U2; Described voltage monitoring circuit (202) comprises voltage monitoring chip U1, the input of voltage monitoring circuit (202) is connected with power supply, and the output of voltage monitoring circuit (202) is connected with power conversion chip U2 and fictitious load unit (203); When the voltage of power supply is less than startup threshold value, voltage monitoring circuit (202) makes power conversion chip U2 not work and the connection of turn-on power and fictitious load unit (203); When the voltage of power supply is greater than startup threshold values, voltage monitoring circuit (202) makes power conversion chip U2 output services voltage to normal operating load and the connection of cut-off power supply and fictitious load unit (203).
2. power starting circuit according to claim 1, is characterized in that: between voltage monitoring circuit (202) and power supply, be also provided with power supply voltage signal sampling unit (201); Filter unit (204) is provided with between power conversion chip U2 and operating load.
3. power starting circuit according to claim 1, it is characterized in that: described voltage monitoring chip U1 inside includes Schmidt trigger, after power conversion chip U2 output services voltage to normal operating load, Schmidt trigger trigger voltage monitoring chip U1 adjusts and starts threshold values to release threshold values, and release threshold values is less than startup threshold values.
4. power starting circuit according to claim 1, is characterized in that: the load of fictitious load unit (203) is more than or equal to the normal operating load after power initiation.
5. according to the arbitrary described power starting circuit of claim 1-4, it is characterized in that: described fictitious load unit (203) comprises triode Q2 and fictitious load resistance R7, the base stage of triode Q2 is connected with the output VOUT of voltage monitoring chip U1, collector electrode is connected with the positive pole of power supply through fictitious load resistance R7, and emitter is connected with the negative pole of power supply.
6. according to the arbitrary described power starting circuit of claim 1-4, it is characterized in that: described voltage monitoring circuit (202) also comprises diode Q1 and resistance R5, the base stage of diode Q1 is connected with the output VOUT of voltage monitoring chip U1, collector electrode is connected with the Enable Pin EN of resistance R5 one end and power conversion chip U2, emitter is connected with the negative pole of power supply, the input VIN of power conversion chip U2 is connected with the positive pole of power supply, and the resistance R5 other end is connected with the positive pole of power supply.
7. according to the arbitrary described power starting circuit of claim 1-4, it is characterized in that: the input VIN of power conversion chip U2 is connected with the positive pole of power supply, earth terminal GND is connected with the negative pole of power supply, Enable Pin EN is connected with the output VOUT of voltage monitoring chip U1, and the output VOUT of power conversion chip U2 is connected with operating load.
8. according to the arbitrary described power starting circuit of claim 1-4, it is characterized in that: described voltage monitoring circuit (202) also comprises triode Q3, the base stage of triode Q3 is connected with the output VOUT of voltage monitoring chip U1, collector electrode is connected with the positive pole of power supply, and emitter is connected with the input VIN of power conversion chip U2.
9. an electronic controller for circuit breaker, is characterized in that: comprise as arbitrary in claim 1-8 as described in power starting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420691865.2U CN204376695U (en) | 2014-11-18 | 2014-11-18 | With the power starting circuit of fictitious load and the electronic controller of circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420691865.2U CN204376695U (en) | 2014-11-18 | 2014-11-18 | With the power starting circuit of fictitious load and the electronic controller of circuit breaker |
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| CN204376695U true CN204376695U (en) | 2015-06-03 |
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| CN201420691865.2U Withdrawn - After Issue CN204376695U (en) | 2014-11-18 | 2014-11-18 | With the power starting circuit of fictitious load and the electronic controller of circuit breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506029A (en) * | 2014-11-18 | 2015-04-08 | 浙江正泰电器股份有限公司 | Power supply starting circuit with artificial load and electronic controller of circuit breaker |
| CN116317660A (en) * | 2023-03-28 | 2023-06-23 | 苏州腾圣技术有限公司 | Controllable inverter circuit |
-
2014
- 2014-11-18 CN CN201420691865.2U patent/CN204376695U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506029A (en) * | 2014-11-18 | 2015-04-08 | 浙江正泰电器股份有限公司 | Power supply starting circuit with artificial load and electronic controller of circuit breaker |
| CN104506029B (en) * | 2014-11-18 | 2017-03-15 | 浙江正泰电器股份有限公司 | The electronic controller of power starting circuit and chopper with fictitious load |
| CN116317660A (en) * | 2023-03-28 | 2023-06-23 | 苏州腾圣技术有限公司 | Controllable inverter circuit |
| CN116317660B (en) * | 2023-03-28 | 2023-10-20 | 苏州腾圣技术有限公司 | Controllable inverter circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150603 Effective date of abandoning: 20171114 |