CN205863904U - A kind of inverter of two grades of overload protections - Google Patents

Abstract

The utility model discloses the inverter of two grades of overload protections; DC/DC translation circuit, DC/AC inversion circuit, battery unit and the CPU element of rear class including prime; also include DC feedback unit, AC regeneration unit; described DC feedback unit is coupled to DC/DC translation circuit to gather cell voltage, is further coupled to CPU element with the magnitude of voltage to CPU element feedback cell voltage；Described AC regeneration unit is coupled to DC/AC inversion circuit to gather load voltage, is further coupled to CPU element with the magnitude of voltage to CPU element feedback load voltage.The inverter that this utility model provides, can be made up by rear class when prime overload protection loses efficacy, and final plant closure exports, thus reaches overload protection purpose.

Description

A kind of inverter of two grades of overload protections

Technical field

This utility model relates to electron electric power technical field, particularly to the inverter of two grades of overload protections.

Background technology

Inverter is that direct current energy (battery, accumulator jar) is transformed into alternating current (generally 220V, 50Hz are sinusoidal wave).It It is made up of inverter bridge, control logic and filter circuit.Briefly, inverter is exactly a kind of by low pressure (12 or 24 volts or 48 volts) Unidirectional current is changed into the electronic equipment of 220 volts of alternating currents.

At present, the most progressively there are some inverters in market, and corresponding technology also comparative maturity, especially in protection side Face, such as, the patent documentation of Publication No. CN105514941A discloses a kind of electric automobile inverter protection device, bag Include: circuit control device, drive circuit, buffer circuit, accessory power supply, emergency circuit and busbar voltage testing circuit；And, string Oneth IGBT of connection and the 2nd IGBT, an IGBT emitter stage and the 2nd IGBT colelctor electrode are connected, and an IGBT colelctor electrode connects Busbar voltage positive pole, the 2nd IGBT emitter stage connects busbar voltage negative pole；Gate pole control signal is by drive circuit and buffering electricity Road exports to IGBT and a gate pole of IGBT, and the power supply of circuit control device is converted into control IGBT break-make by accessory power supply Voltage and to drive circuitry, busbar voltage testing circuit judges that busbar voltage, and will whether higher than bus HVT high voltage threshold Voltage comparison signal exports to circuit control device, and emergency circuit is powered by busbar voltage and exported gate signal control three-phase lower half Bridge IGBT turns on, and makes inverter enter actively short-circuit mode, and drive circuit is resetted by the exportable reset signal of circuit control device； Wherein, actively short-circuit mode includes: upper actively short-circuit mode, half-bridge IGBT conducting on three-phase, under three-phase, half-bridge IGBT turns off；Under Actively short-circuit mode, on three-phase, half-bridge IGBT turns off, half-bridge IGBT conducting under three-phase；Drive circuit and accessory power supply have height Pressure isolation features.

Wherein, this inverter has busbar voltage (step voltage before inverter) overvoltage failure protection function, will bus electricity Pressing the secure threshold (bus HVT high voltage threshold) with definition to compare in real time, once busbar voltage exceedes secure threshold, i.e. to inverse Becoming device controller and send high voltage fault signal NFUZMAX, circuit control device makes inverter enter ASC pattern；Busbar voltage is i.e. The voltage of bus capacitor, is also cell voltage.

This protection device is equally applicable to the other kinds of inverter in addition to electric automobile inverter, but, if female Line voltage detecting breaks down and lost efficacy, and makes controller cannot send high voltage fault signal NFUZMAX, can causing trouble protection lose Effect.

Summary of the invention

The purpose of this utility model is to provide inverter, and this inverter can pass through rear class when prime overload protection loses efficacy Making up, final plant closure exports, thus reaches overload protection purpose.

Above-mentioned purpose of the present utility model technical scheme is that.

A kind of inverter of two grades of overload protections, including the DC/DC translation circuit of prime, the DC/AC inversion circuit of rear class, Battery unit and CPU element, also include that DC feedback unit, AC regeneration unit, described DC feedback unit are coupled to DC/DC Translation circuit, to gather cell voltage, is further coupled to CPU element with the magnitude of voltage to CPU element feedback cell voltage；Described friendship Stream feedback unit is coupled to DC/AC inversion circuit to gather load voltage, is further coupled to CPU element to bear to CPU element feedback Carry the magnitude of voltage of voltage.

By using technique scheme, owing to being provided with DC feedback unit in the front end of transformator, and at transformator Rear end is provided with AC regeneration unit, CPU element can first prime to inverter, i.e. the cell voltage of DC/DC translation circuit is carried out Detection, if this magnitude of voltage is more than the first preset value, CPU element makes inverter prime close output.Prime to inverter again, i.e. The load voltage of DC/AC inversion circuit detects, if this magnitude of voltage is more than the second preset value, CPU element makes inverter close Output；Here it is worth noting that the mode making inverter close output has two kinds, first remove to judge the battery of the prime of inverter Voltage is the most normal, if normally, makes inverter rear class close output by CPU element；Maybe just cannot determine whether if abnormal Often, inverter prime is made to close output by CPU element.

Preferred: described DC feedback unit includes that sample resistance, one end of described sample resistance are used for gathering battery electricity Pressure, the other end are for the magnitude of voltage to CPU element feedback cell voltage.

Preferred: described AC regeneration unit includes current-limiting resistance and is series at the RC circuit of current-limiting resistance, described RC electricity Road is for the magnitude of voltage of CPU element feedback load voltage.

So, using current-limiting resistance that sampled signal can carry out current limliting, use RC circuit can improve response speed, raising is adopted The precision of sample signal.

Preferred: also to include the indicating member being made up of switching device, display lamp, described switching device is coupled to transformator Prime, according to the magnitude of voltage change on and off of cell voltage, controls display lamp and lights or extinguish.

So, by arranging switching device, display lamp and corresponding auxiliary circuit, when cell voltage exists overpressure conditions Time can make duty instruction, in order to man-machine interaction.

Accompanying drawing explanation

Fig. 1 is the functional block diagram of inverter；

Fig. 2 is the schematic diagram of DC feedback unit in inverter；

Fig. 3 is the schematic diagram of AC regeneration unit in inverter；

Fig. 4 is the schematic diagram of indicating member in inverter.

Detailed description of the invention

Below in conjunction with accompanying drawing, this utility model is described in further detail.

With reference to Fig. 1, a kind of inverter, including the DC/DC translation circuit 100 of prime, the DC/AC inversion circuit 200 of rear class, Battery unit 300, CPU element 400, DC feedback unit 500, AC regeneration unit 600, DC feedback unit 500 is coupled to DC/DC translation circuit 100, to gather cell voltage, is further coupled to CPU element 400 to feed back cell voltage to CPU element 400 Magnitude of voltage；AC regeneration unit 600 is coupled to DC/AC inversion circuit 200 to gather load voltage, is further coupled to CPU element 400 With the magnitude of voltage to CPU element 400 feedback load voltage.Due to the preposition DC feedback unit 500 that is provided with at transformator, and The rearmounted AC regeneration unit 600 that is provided with of transformator, CPU element 400 can first prime to inverter, i.e. DC/DC translation circuit The cell voltage of 100 detects, if this magnitude of voltage is more than the first preset value, it is defeated that CPU element 400 makes inverter prime close Go out.Prime to inverter again, i.e. the load voltage of DC/AC inversion circuit 200 detects, if this magnitude of voltage is pre-more than second If value, CPU element 400 makes inverter close output；Here it is worth noting that the mode making inverter close output has two Kind, first go the cell voltage judging the prime of inverter the most normal, if normally, make inverter rear class close by CPU element 400 Close output；Maybe cannot determine whether normally if abnormal, make inverter prime close output by CPU element 400.

With reference to Fig. 2, in one embodiment, DC feedback unit bag 500 includes sample resistance RX, one end of sample resistance RX For gathering cell voltage, the other end for the magnitude of voltage to CPU element feedback cell voltage.

With reference to Fig. 3, in one embodiment, AC regeneration unit 600 includes current-limiting resistance and is series at current-limiting resistance RC circuit, RC circuit is for the magnitude of voltage of CPU element feedback load voltage.So, employing current-limiting resistance can be to sampled signal Carry out current limliting, use RC circuit can improve response speed, improve the precision of sampled signal.

With reference to Fig. 4, in one embodiment, indicating member includes switching device N01, display lamp LED-R, switching device coupling It is connected to the DC/DC translation circuit 100 of prime, according to the magnitude of voltage change on and off of cell voltage, controls display lamp LED-R Light or extinguish.So, by arranging switching device N01, display lamp LED-R and corresponding auxiliary circuit, cell voltage is worked as Duty instruction can be made, in order to man-machine interaction when there is overpressure conditions.

This specific embodiment is only that it is not to restriction of the present utility model, ability to explanation of the present utility model The present embodiment can be made after reading this specification by field technique personnel as required does not has the amendment of creative contribution, but As long as all being protected by Patent Law in right of the present utility model.

Claims (4)

1. an inverter for two grades of overload protections, including the DC/DC translation circuit of prime, the DC/AC inversion circuit of rear class, electricity Pool unit and CPU element, it is characterised in that also include DC feedback unit, AC regeneration unit, described DC feedback unit coupling It is connected to DC/DC translation circuit to gather cell voltage, is further coupled to CPU element with the voltage to CPU element feedback cell voltage Value；Described AC regeneration unit is coupled to DC/AC inversion circuit to gather load voltage, is further coupled to CPU element with mono-to CPU The magnitude of voltage of unit's feedback load voltage.

2. according to the inverter of two described in claim 1 grade overload protection, it is characterised in that described DC feedback unit bag Including sample resistance, one end of described sample resistance is used for gathering cell voltage, the other end for feeding back cell voltage to CPU element Magnitude of voltage.

3. according to the inverter of two described in claim 1 grade overload protection, it is characterised in that described AC regeneration unit bag Including current-limiting resistance and be series at the RC circuit of current-limiting resistance, described RC circuit is for the voltage of CPU element feedback load voltage Value.

4. according to the inverter of two described in claim 1 grade overload protection, it is characterised in that also include by switching device, The indicating member that display lamp is constituted, described switching device is coupled to DC/DC translation circuit, according to the magnitude of voltage change of cell voltage On and off, controls display lamp and lights or extinguish.