CN210225277U - Preceding stage driving circuit for inverter - Google Patents
Preceding stage driving circuit for inverter Download PDFInfo
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- CN210225277U CN210225277U CN201921607455.4U CN201921607455U CN210225277U CN 210225277 U CN210225277 U CN 210225277U CN 201921607455 U CN201921607455 U CN 201921607455U CN 210225277 U CN210225277 U CN 210225277U
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Abstract
The utility model discloses a preceding stage driving circuit for an inverter, which comprises an inverter driving circuit and an overcurrent short-circuit protection circuit electrically connected with the inverter driving circuit; the inverter driving circuit comprises an integrated circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first triode, a second triode, a third triode, a fourth triode and a connector, and is used in a preceding stage driving circuit of the inverter, wherein the tenth end of the integrated circuit can monitor the input current of the inverter in real time through a first diode, so that the overcurrent protection effect is achieved; moreover, the tenth end of integrated circuit puts the input voltage of constituteing through the amplifier circuit who puts by the second fortune and the voltage comparator that first fortune was put to the dc-to-ac converter and is carried out real time monitoring, and then has played the short-circuit protection effect, the utility model relates to a rationally, be fit for using widely.
Description
Technical Field
The utility model relates to an inverter field, concretely relates to preceding stage drive circuit for dc-to-ac converter.
Background
When the off-grid inverter is used, the client side can cause output short circuit due to uncertain factors, and if short circuit protection is not thorough, the inverter can be damaged, and safety accidents are caused under severe conditions. The existing inverter short-circuit protection control mode is generally hardware short-circuit protection, but the MOS tube is easy to break down when the inverter short-circuit current is large, so that the circuit short-circuit protection is failed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome foretell not enough, provide a preceding stage drive circuit for dc-to-ac converter.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a preceding stage driving circuit for an inverter comprises an inverter driving circuit and an overcurrent short-circuit protection circuit electrically connected with the inverter driving circuit;
the inverter driving circuit comprises an integrated circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first triode, a second triode, a third triode, a fourth triode and a connector, wherein the connector is provided with 7 ports, a first port of the connector is respectively connected with an emitting electrode of the first triode and a collector electrode of the third triode, a second port of the connector is respectively connected with an emitting electrode of the second triode and a collector electrode of the fourth triode, a third port and a sixth port of the connector are both electrically connected with an overcurrent short-circuit protection circuit, a fourth port and a seventh port of the connector are both grounded, a fifth port of the connector is externally connected with a 12V direct-current voltage power supply, the type of the integrated circuit is SG3525AP, and a sixteenth port and a second port of the integrated circuit are both externally connected with a 5V direct-current voltage power supply, the sixth end of the integrated circuit is grounded through a first resistor, the seventh end of the integrated circuit is connected with the fifth end of the integrated circuit through a second resistor, the fifth end of the integrated circuit is grounded through a third capacitor, the first end of the integrated circuit is grounded, the tenth end of the integrated circuit is grounded through a fifth resistor, the eighth end of the integrated circuit is grounded through a fourth capacitor, the fourteenth end of the integrated circuit is respectively connected with the base of a second triode and the base of a fourth triode through a fourth resistor, the eleventh end of the integrated circuit is respectively connected with the base of the first triode and the base of the third triode through a third resistor, the thirteenth end and the fifteenth end of the integrated circuit are externally connected with a 12V direct current voltage power supply, the collector of the first triode and the collector of the second triode are externally connected with a 12V direct current voltage power supply, one end of the first capacitor is externally connected with a 12V direct current voltage power supply, the other end of the first capacitor is grounded, the first capacitor is connected with the second capacitor in parallel, and the collector of the third triode and the collector of the fourth triode are both grounded;
the overcurrent short-circuit protection circuit comprises a first operational amplifier, a second operational amplifier, a first diode, a second diode, a third diode, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an adjustable resistor, a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein the first operational amplifier and the second operational amplifier are both LM358 in model, a third port of a connector is grounded through a series circuit formed by the eighth resistor and the sixth capacitor, a third port of the connector is respectively connected with a cathode of the second diode and a non-inverting input end of the first operational amplifier through the eleventh resistor, a sixth end of the connector is connected with an anode of the first diode, a cathode of the first diode is connected with a tenth end of the integrated circuit through the sixth resistor, a cathode of the first diode is grounded through the fifth capacitor, and a cathode of the first diode is respectively connected with an output end of the first operational amplifier and an anode of the third diode, the negative electrode of the third diode is connected with the in-phase input end of the first operational amplifier, the inverting input end of the first operational amplifier is grounded through a tenth resistor and is externally connected with a 5V direct-current voltage power supply through a seventh resistor, the output end of the second operational amplifier is connected with the positive electrode of the second diode through a ninth resistor, the output end of the second operational amplifier is grounded through a series circuit formed by an adjustable resistor and a twelfth resistor, the inverting input end of the second operational amplifier is connected with the adjustable end of the adjustable resistor, the inverting input end of the second operational amplifier is respectively connected with the adjustable resistor and the twelfth resistor, the in-phase input end of the second operational amplifier is respectively connected with an eighth resistor and a sixth capacitor, the power supply ends of the first operational amplifier and the second operational amplifier are externally connected with the 5V direct-current voltage power supply, the grounding ends of the first operational amplifier and the second operational amplifier are both grounded, and the in-phase input end of the first operational.
In the preceding stage driving circuit for the inverter, a connector is connected with the inverter, a first port and a second port of the connector are electrically connected with two PWM (pulse width modulation) ports of the inverter, and the PWM ports of the inverter are used for controlling the duty ratio of internal direct current regulation so as to realize the regulation of the output voltage of the inverter; the eleventh end of the integrated circuit controls the on-off of the first triode and the third triode through the third resistor, the fourteenth end of the integrated circuit controls the on-off of the second triode and the fourth triode through the fourth resistor, and therefore on-off control of the two PWM ports of the inverter can be achieved, and the duty ratio of direct current regulation inside the inverter can be controlled.
The third port of the connector is externally connected with a voltage transformer inside the inverter and used for collecting an input voltage value of the inverter, then the collected voltage passes through an amplifying circuit formed by a second operational amplifier and enters a voltage comparator formed by a first operational amplifier, when the voltage is higher than a set value, the output end of the first operational amplifier outputs a low level, when the voltage is lower than the set value (the set value is determined by the resistance value ratio of a seventh resistor and a tenth resistor), the output end of the first operational amplifier outputs a high level, at the moment, the tenth end of the integrated circuit is triggered through a sixth resistor, so that the integrated circuit is switched off, the driving of the inverter is stopped, the inverter is switched off, and the short-circuit protection of the inverter can be realized.
The sixth end of the connector is externally connected with a current transformer inside the inverter, the current transformer is used for collecting the input current value of the inverter, the current value passes through the sixth end of the connector, the first diode enters the tenth end of the integrated circuit, the first diode is a current-limiting diode and is used for protecting the integrated circuit from being burnt by large current, the turn-off value of the tenth end of the integrated circuit is determined by the resistance value of the sixth resistor and the maximum current value of the first diode, when the input current value of the inverter exceeds the turn-off value of the tenth end of the integrated circuit, the integrated circuit is turned off at the moment, the driving of the inverter is stopped, the inverter is turned off, the overcurrent protection can be further realized, and the breakdown of an MOS (metal oxide.
Preferably, the first triode and the second triode are both in TIP122 model, and the third triode and the fourth triode are both in TIP127 model.
Preferably, the first diode, the second diode and the third diode are all 1N4148 in type.
Preferably, the resistance value range of the adjustable resistor is 50k ohms.
The utility model has the advantages that: in the preceding stage driving circuit for the inverter, the tenth end of the integrated circuit can monitor the input current of the inverter in real time through the first diode, so that the overcurrent protection effect is realized; and the tenth end of the integrated circuit monitors the input voltage of the inverter in real time through an amplifying circuit consisting of the second operational amplifier and a voltage comparator consisting of the first operational amplifier, thereby playing a role in short-circuit protection.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic circuit diagram of the present invention.
In the figure: u1. integrated circuit, U2. first operational amplifier, U3. second operational amplifier, r1 first resistor, r2 second resistor, r3 third resistor, r4 fourth resistor, R5. fifth resistor, R6. sixth resistor, R7. seventh resistor, R8. eighth resistor, R9. ninth resistor, r10 tenth resistor, r11 eleventh resistor, r12 twelfth resistor, wr1 adjustable resistor, c1 first capacitor, C2. second capacitor, C3. third capacitor, c4 fourth capacitor, C5. fifth capacitor, C6. sixth capacitor, C7. seventh capacitor, Q1. first triode, q2 second triode, Q3. third triode, q4 fourth triode, p1 connector, vd1 first diode, vd2 second diode, vd3 third diode.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, a pre-stage driving circuit for an inverter includes an inverter driving circuit and an overcurrent short-circuit protection circuit electrically connected to the inverter driving circuit;
the inverter driving circuit comprises an integrated circuit U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4 and a connector P1, wherein the connector P1 is provided with 7 ports, a first port of the connector P1 is respectively connected with an emitter of the first triode Q1 and a collector of the third triode Q1, a second port of the connector P1 is respectively connected with an emitter of the second triode Q1 and a collector of the fourth triode Q1, a third port and a sixth port of the connector P1 are both electrically connected with an overcurrent short-circuit protection circuit, the fourth port and a seventh port of the P1 are both grounded, a fifth connector of the P1 is an external power supply connector 3512V 3572, the type SG 1 of the integrated circuit SG 1, the sixteenth end and the second end of the integrated circuit U1 are both externally connected with a 5V direct current voltage power supply, the sixth end of the integrated circuit U1 is grounded through a first resistor R1, the seventh end of the integrated circuit U1 is connected with the fifth end of the integrated circuit U1 through a second resistor R2, the fifth end of the integrated circuit U1 is grounded through a third capacitor C3, the first end of the integrated circuit U1 is grounded, the tenth end of the integrated circuit U1 is grounded, the tenth end of the integrated circuit U1 is grounded through a fifth resistor R5, the eighth end of the integrated circuit U1 is grounded through a fourth capacitor C4, the fourteenth end of the integrated circuit U1 is respectively connected with the base of the second triode Q2 and the base of the fourth triode Q4 through a fourth resistor R4, the eleventh end of the integrated circuit U1 is respectively connected with the base of the first triode Q1 and the base of the third triode Q3 through a third resistor R3, and the tenth end of the integrated circuit U1 and the fifth end of the integrated circuit U3912 are both externally connected with the voltage power supply, a collector of the first triode Q1 and a collector of the second triode Q2 are both externally connected with a 12V direct-current voltage power supply, one end of a first capacitor C1 is externally connected with the 12V direct-current voltage power supply, the other end of the first capacitor C1 is grounded, the first capacitor C1 is connected with a second capacitor C2 in parallel, and a collector of a third triode Q3 and a collector of a fourth triode Q4 are both grounded;
the overcurrent short-circuit protection circuit comprises a first operational amplifier U2, a second operational amplifier U3, a first diode VD1, a second diode VD2, a third diode VD3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R10, a twelfth resistor R10, an adjustable resistor WR 10, a fifth capacitor C10, a sixth capacitor C10 and a seventh capacitor C10, wherein the models of the first operational amplifier U10 and the second operational amplifier U10 are LM358, a third port of the connector P10 is grounded through a series circuit formed by the eighth resistor R10 and the sixth capacitor C10, a third port of the connector P10 is respectively connected with a cathode of the second diode VD 10 and an input end of the first operational amplifier U10 through the eleventh resistor R10, a cathode of the first connector P10 is connected with an anode of the first diode VD 10, and an anode of the first diode VD 10 are connected with an integrated resistor VD 10 of the first diode VD 10, the cathode of a first diode VD1 is grounded through a fifth capacitor C5, the cathode of a first diode VD1 is respectively connected with the output end of a first operational amplifier U2 and the anode of a third diode VD3, the cathode of a third diode VD3 is connected with the non-inverting input end of the first operational amplifier U2, the inverting input end of the first operational amplifier U2 is grounded through a tenth resistor R10 and externally connected with a 5V direct-current voltage power supply through a seventh resistor R7, the output end of a second operational amplifier U3 is connected with the anode of a second diode 46VD 48 through a ninth resistor R9, the output end of the second operational amplifier U3 is grounded through a series circuit consisting of an adjustable resistor WR1 and a twelfth resistor R12, the inverting input end of the second operational amplifier U3 is connected with the adjustable terminal of an adjustable resistor WR1, the inverting input end of the second operational amplifier U3 is respectively connected with an adjustable resistor WR1 and a twelfth resistor R12, the non-inverting input end of the second operational amplifier U56 is respectively connected with an eighth resistor R8653 and a sixth capacitor C868427, the power supply ends of the first operational amplifier U2 and the second operational amplifier U3 are both externally connected with a 5V direct-current voltage power supply, the grounding ends of the first operational amplifier U2 and the second operational amplifier U3 are both grounded, and the non-inverting input end of the first operational amplifier U2 is grounded through a seventh capacitor C7.
In the front-stage driving circuit for the inverter, a connector P1 is connected with the inverter, a first port and a second port of a connector P1 are electrically connected with two PWM (pulse width modulation) ports of the inverter, and the PWM ports of the inverter are used for controlling the duty ratio of internal direct current regulation so as to realize the regulation of the output voltage of the inverter; the eleventh end of the integrated circuit U1 controls the on/off of the first triode Q1 and the third triode Q3 through the third resistor R3, and the fourteenth end of the integrated circuit U1 controls the on ends of the second triode Q2 and the fourth triode Q4 through the fourth resistor R4, so that the two PWM ports of the inverter can be switched, and the duty ratio of the internal direct current regulation of the inverter can be controlled.
The third port of the connector P1 is externally connected to a voltage transformer inside the inverter for collecting an input voltage value of the inverter, and then the collected voltage enters a voltage comparator composed of a first operational amplifier U2 through an amplifying circuit composed of a second operational amplifier U3, when the voltage is higher than a set value, the output end of the first operational amplifier U2 outputs a low level, and when the voltage is lower than the set value (the set value is determined by a resistance ratio of a seventh resistor R7 and a tenth resistor R10), the output end of the first operational amplifier U2 outputs a high level, and at this time, the tenth end of the integrated circuit U1 is triggered through the sixth resistor R6, so that the integrated circuit U1 is turned off, the driving of the inverter is stopped, the inverter is turned off, and the inverter short-circuit protection can be achieved.
The sixth end of the connector P1 is externally connected with a current transformer in the inverter and used for collecting the input current value of the inverter, then the current value enters the tenth end of the integrated circuit U1 through the sixth end of the connector P1 and the first diode VD1, the first diode VD1 is a current-limiting diode and used for protecting the integrated circuit U1 from being burnt by large current, the turn-off value of the tenth end of the integrated circuit U1 is determined by the resistance value of the sixth resistor R6 and the maximum current value of the first diode VD1, when the input current value of the inverter exceeds the turn-off value of the tenth end of the integrated circuit U1, the integrated circuit U1 is turned off at the moment, the driving of the inverter is stopped, the inverter is turned off, and the overcurrent protection of the inverter can be further achieved.
In this example: the first transistor Q1 and the second transistor Q2 are both TIP122, and the third transistor Q3 and the fourth transistor Q4 are both TIP 127.
In this example: the models of the first diode VD1, the second diode VD2 and the third diode VD3 are all 1N 4148.
In this example: the adjustable resistor WR1 has a resistance value in the range of 50k ohms.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921607455.4U CN210225277U (en) | 2019-09-25 | 2019-09-25 | Preceding stage driving circuit for inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921607455.4U CN210225277U (en) | 2019-09-25 | 2019-09-25 | Preceding stage driving circuit for inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210225277U true CN210225277U (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921607455.4U Active CN210225277U (en) | 2019-09-25 | 2019-09-25 | Preceding stage driving circuit for inverter |
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| Country | Link |
|---|---|
| CN (1) | CN210225277U (en) |
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- 2019-09-25 CN CN201921607455.4U patent/CN210225277U/en active Active
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