CN211995170U - Circuit for generating positive and negative voltage by single winding - Google Patents
Circuit for generating positive and negative voltage by single winding Download PDFInfo
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- CN211995170U CN211995170U CN202020868662.1U CN202020868662U CN211995170U CN 211995170 U CN211995170 U CN 211995170U CN 202020868662 U CN202020868662 U CN 202020868662U CN 211995170 U CN211995170 U CN 211995170U
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Abstract
The utility model relates to a circuit of single winding generation positive negative pressure, include: the precise voltage-stabilizing power supply circuit is used for converting the input voltage into required positive-phase voltage and negative-phase voltage; the push-pull circuit connected with the precision voltage-stabilizing source circuit in parallel comprises a first triode and a second triode, wherein emitting electrodes of the two triodes are connected with a grounding end; the base electrodes of the two triodes are connected and connected with a precision voltage-stabilizing source circuit, the base electrode of the first triode is connected with the positive-phase voltage input end, and the base electrode of the second triode is connected with the negative-phase voltage input end; the collector of the first triode is connected with the positive phase voltage input end and the positive phase voltage output end for outputting the required positive phase voltage, and the collector of the second triode is connected with the negative phase voltage input end and the negative phase voltage output end for outputting the required negative phase voltage. The utility model discloses a positive negative pressure that output is stable has been realized to accurate steady voltage source circuit and push-pull circuit, has simple structure, characteristics with low costs.
Description
Technical Field
The utility model relates to a vehicle motor control technical field refers in particular to a circuit that single winding generated positive negative pressure.
Background
In the field of vehicle-mounted motor controllers, the motor controller is required to enter an active short-circuit state and then perform emergency discharge in consideration of a safety mode after the motor controller fails. Active short circuit and emergency discharge both need the high-pressure side flyback power supply to generate positive and negative voltage to supply power for driving, so the number of transformer windings can be increased, and the volume and the cost of the transformer are increased. In addition, a single winding can generate positive and negative voltage through two LDOs, but the cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a circuit that single winding generates positive negative pressure, solve and provide positive negative pressure now and need increase winding quantity and increase the volume of transformer and the problem of cost and solve the higher problem of cost that single winding passes through two LDO generation positive negative pressures and exist.
The technical scheme for realizing the purpose is as follows:
the utility model provides a circuit of single winding generation positive negative pressure, include:
the precise voltage-stabilizing power supply circuit is connected to the positive-phase voltage input end and the negative-phase voltage input end and is used for converting the input voltage into the required positive-phase voltage and negative-phase voltage; and
a push-pull circuit connected to the positive phase voltage input end and the negative phase voltage input end and connected in parallel with the precision voltage regulator circuit, wherein the push-pull circuit comprises a first triode and a second triode,
the emitter of the first triode is connected with the emitter of the second triode and is connected with a grounding end;
the base electrode of the first triode is connected with the base electrode of the second triode and is connected with the precision voltage-stabilizing source circuit, the base electrode of the first triode is connected with the positive-phase voltage input end, and the base electrode of the second triode is connected with the negative-phase voltage input end;
the collector of the first triode is connected with the positive phase voltage input end and the positive phase voltage output end for outputting the required positive phase voltage, and the collector of the second triode is connected with the negative phase voltage input end and the negative phase voltage output end for outputting the required negative phase voltage.
The utility model discloses a required normal phase voltage and negative phase voltage are converted into with input voltage to accurate steady voltage source circuit, through push-pull circuit in the required normal phase voltage of normal phase voltage output, in the required negative phase voltage of negative phase voltage output, utilize push-pull circuit to ensure that output voltage is stable. The utility model discloses a positive negative pressure that accurate steady voltage source circuit and push-pull circuit have realized exporting stably has simple structure, characteristics with low costs, has solved the problem that increases transformer volume and cost that increases that the winding quantity brought among the prior art, has still solved among the prior art single winding and has made the higher problem of cost through two LDO generation positive negative pressures.
The utility model discloses a single winding generates positive negative voltage's circuit further improves lie in, the push-pull circuit still includes first diode and second diode;
the anode of the first diode is connected with the base electrode of the first triode and the positive-phase voltage input end, and the cathode of the first diode is connected with the anode of the second diode and the precision voltage-stabilizing source circuit;
and the cathode of the second diode is connected with the base electrode of the second triode and the negative phase voltage input end.
The circuit for generating positive and negative voltage by single winding of the present invention is further improved in that a first resistor is connected between the anode of the first diode and the positive voltage input terminal;
and a second resistor is connected between the cathode of the second diode and the negative phase voltage input end.
The utility model discloses a single winding generates positive negative pressure's circuit further improves to lie in, the forward voltage drop of first triode is less than the voltage drop of the base of first triode and projecting pole;
and the forward voltage drop of the second diode is smaller than the voltage drop of the base electrode and the emitter electrode of the second triode.
The utility model discloses the circuit of single winding generation positive negative pressure is further improved in that, the accurate steady voltage source circuit includes three-terminal adjustable shunting reference source, third resistance, fourth resistance and fifth resistance;
the three-terminal adjustable shunt reference source comprises a first pin, a second pin and a third pin, and the first pin is connected with the positive-phase voltage input end;
the third resistor, the fourth resistor and the fifth resistor are connected in series, the third resistor is connected with the positive phase voltage input end, and the fifth resistor is connected with the negative phase voltage input end;
the second pin is connected between the third resistor and the fourth resistor;
the third pin is connected between the fourth resistor and the fifth resistor and is connected with the cathode of the first diode and the anode of the second diode.
The utility model discloses a further improvement of the circuit that single winding generates positive negative pressure lies in that, the collecting electrode of the first triode is connected with a sixth resistor, and the sixth resistor is connected with the positive phase voltage input end and the positive phase voltage output end for outputting the required positive phase voltage;
and the collector of the second triode is connected with a seventh resistor, and the seventh resistor is connected with the negative phase voltage input end and the negative phase voltage output end for outputting the required negative phase voltage.
The utility model discloses the further improvement of the circuit of single winding generation positive negative pressure lies in, positive phase voltage input end with connect a first electric capacity between negative phase voltage input end.
The circuit for generating positive and negative voltage by a single winding is further improved in that a second capacitor is connected between the positive-phase voltage output end and the grounding end;
and a third capacitor is connected between the negative phase voltage output end and the grounding end.
The utility model discloses the further improvement of the circuit of single winding generation positive negative pressure lies in, positive phase voltage input with negative phase voltage input connects the transformer that has single winding.
The utility model discloses the further improvement of the circuit of single winding generation positive negative pressure lies in, positive phase voltage output and/or negative phase voltage output is connected with the load.
Drawings
Fig. 1 is a circuit diagram of a circuit for generating positive and negative voltages by a single winding according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Referring to fig. 1, the utility model provides a circuit that single winding generates positive negative pressure for solve two windings and generate the problem that positive negative pressure increases the volume and the cost of transformer. The utility model discloses gather single winding and form input voltage after rectifier filter, provide accurate required normal phase voltage through accurate steady voltage source circuit, through the stable normal phase voltage of push-pull circuit output and negative phase voltage, when positive power area load, negative power area load or positive and negative power area load simultaneously, can all guarantee the normal phase voltage stability of output. The circuit for generating positive and negative voltages by a single winding according to the present invention will be described with reference to the accompanying drawings.
Referring to fig. 1, a circuit diagram of a circuit for generating positive and negative voltages by a single winding according to the present invention is shown. The circuit for generating positive and negative voltages by a single winding according to the present invention will be described with reference to fig. 1.
As shown in fig. 1, the circuit for generating positive and negative voltages by a single winding of the present invention includes a precise voltage regulator circuit S1 and a push-pull circuit S2, wherein the precise voltage regulator circuit S1 is connected to a positive phase voltage input terminal I1 and a negative phase voltage input terminal I2, and the precise voltage regulator circuit S1 is used for converting an input voltage into a required positive phase voltage and a required negative phase voltage; the push-pull circuit S2 is also connected to a positive phase voltage input end I1 and a negative phase voltage input end I2, the push-pull circuit S2 is connected in parallel with the precision voltage stabilization source circuit S1, the push-pull circuit S2 comprises a first triode Q1 and a second triode Q2, the first triode Q1 and the second triode Q2 both comprise a collector c, a base b and an emitter e, and the emitter e of the first triode Q1 and the emitter e of the second triode Q2 are connected and connected with a ground terminal GND; the base b of the first triode Q1 and the base b of the second triode Q2 are connected and are connected with a precision voltage-stabilizing source circuit S1, the base b of the first triode Q1 is connected with a positive phase voltage input end I1, and the base b of the second triode Q2 is connected with a negative phase voltage input end I2; a collector c of the first transistor Q1 is connected to the positive phase voltage input terminal I1 and the positive phase voltage output terminal O1 for outputting a required positive phase voltage, and a collector c of the second transistor Q2 is connected to the negative phase voltage input terminal I2 and the negative phase voltage output terminal O2 for outputting a required negative phase voltage.
The input voltages at the positive phase voltage input end I1 and the negative phase voltage input end I2 are converted into the required positive phase voltage and negative phase voltage through the precise voltage-stabilizing source circuit S1, and then the stable positive phase voltage and negative phase voltage are output by the push-pull circuit S2. The utility model discloses a push-pull circuit S2 adopts two triode elements, has simple structure, characteristics with low costs.
In one embodiment of the present invention, the push-pull circuit S2 further includes a first diode D1 and a second diode D2;
the anode of the first diode D1 is connected with the base b of the first triode Q1 and is connected with the positive phase voltage input end I1, and the cathode of the first diode D1 is connected with the anode of the second diode D2 and is connected with the precision voltage-stabilizing source circuit S1;
the cathode of the second diode D2 is connected to the base b of the second transistor Q2 and to the negative phase voltage input I2.
Further, a first resistor R1 is connected between the anode of the first diode D1 and the positive phase voltage input terminal I1; a second resistor R2 is connected between the cathode of the second diode D2 and the negative phase voltage input terminal I2. The first and second resistors R1 and R2 provide bias current to the first and second diodes D1 and D2 at the input of the push-pull circuit S2 and establish the quiescent current on that side.
Preferably, the forward voltage drop of the first diode D1 is smaller than the voltage drop of the base b and the emitter e of the first transistor Q1; the forward voltage drop of the second diode D2 is less than the voltage drop of the base b and the emitter e of the second transistor Q2. Therefore, the two triodes can be ensured to have no current passing in no-load.
In a specific embodiment of the present invention, the precision voltage regulator S1 includes a three-terminal adjustable shunt reference source U1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5;
the three-terminal adjustable shunt reference source U1 comprises a first pin 1, a second pin 2 and a third pin 3, wherein the first pin 1 is connected with a positive phase voltage input end I1;
the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in series, the third resistor R3 is connected with the positive phase voltage input end I1, and the fifth resistor R5 is connected with the negative phase voltage input end I2;
the second pin 2 is connected between the third resistor R3 and the fourth resistor R4;
the third pin 3 is connected between the fourth resistor R4 and the fifth resistor R5, and is connected to the cathode of the first diode D1 and the anode of the second diode D2.
Preferably, the three-terminal adjustable shunt reference source U1 adopts TL431, and can provide accurate positive phase voltage. The three-terminal adjustable shunt reference source U1 converts the input voltage Uin into an accurate positive phase voltage Up and a negative phase voltage Un, where the positive phase voltage Up is the voltage of the first pin 1 to the third pin 3 of the three-terminal adjustable shunt reference source U1, and the negative phase voltage Un is the voltage across the fifth resistor R5. The positive phase voltage Up can be accurately adjusted according to actual needs, and the negative phase voltage Un is a negative value which is equal to the subtraction of the input voltage Uin from the positive phase voltage Up.
In one embodiment of the present invention, the collector c of the first transistor Q1 is connected to a sixth resistor R6, and the sixth resistor R6 is connected to the positive phase voltage input terminal I1 and the positive phase voltage output terminal O1 for outputting the required positive phase voltage;
the collector c of the second transistor Q2 is connected to a seventh resistor R7, and the seventh resistor R7 is connected to the negative phase voltage input terminal I2 and the negative phase voltage output terminal O2 for outputting the required negative phase voltage.
When overload or short circuit occurs, the output current can be effectively limited by the sixth resistor R6 and the seventh resistor R7, and the overload protection function is achieved, so that devices in the circuit cannot be damaged.
In one embodiment of the present invention, a first capacitor C1 is connected between the positive phase voltage input terminal I1 and the negative phase voltage input terminal I2.
Further, a second capacitor C2 is connected between the positive phase voltage output terminal O1 and the ground GND;
a third capacitor C3 is connected between the negative phase voltage output terminal O2 and the ground GND.
Still further, the positive phase voltage input terminal I1 and the negative phase voltage input terminal I2 are connected to a transformer having a single winding. The single winding transformer provides input voltage for the precision voltage regulator circuit S1 after rectification and filtering.
Further, the positive phase voltage output terminal O1 and/or the negative phase voltage output terminal O2 are connected to a load. The second capacitor C2 and the third capacitor C3 provide instantaneous peak current to the load.
The working principle of the circuit for generating positive and negative voltages by a single winding according to the present invention is explained below.
When only the positive phase voltage output terminal O1 is connected to the load, the second transistor Q2 and the seventh resistor R7 form a loop, the second transistor Q2 dynamically adjusts the output current to stabilize the output voltage of the positive phase voltage output terminal O1, and the first transistor Q1 is in a cut-off state. The actual positive phase voltage output by the positive phase voltage output terminal O1 is Up-VF _ D2+ VBE _ Q2, where Up is the positive phase voltage (i.e., the required voltage) converted by the precision regulator circuit, VF _ D2 is the forward voltage drop of the second diode D2, and VBE _ Q2 is the be voltage drop (the voltage drop between the base b and the emitter e) of the second transistor Q2. There is a certain error between the actual output voltage and the required voltage, and the error range is determined by the forward voltage drop of the diode and the voltage drop of the triode be.
When only the negative phase voltage output end O2 is connected to the load, the first transistor Q1 and the sixth resistor R6 form a loop, the first transistor Q1 dynamically adjusts the output current to stabilize the output voltage of the positive voltage output end O1, and the second transistor Q2 is in a cut-off state. The actual positive phase voltage output by the positive phase voltage output terminal O1 is Up + VF _ D1-VBE _ Q1, where Up is the positive phase voltage (i.e., the required voltage) converted by the precision regulator circuit, VF _ D1 is the forward voltage drop of the first diode D1, and VBE _ Q1 is the be voltage drop (the voltage drop between the base b and the emitter e) of the first transistor Q1. Similarly, there is a certain error between the actual output voltage and the required voltage, and the error range is determined by the forward voltage drop of the diode and the voltage drop of the triode be.
When the positive voltage output terminal O1 and the negative voltage output terminal O2 are connected to the load at the same time, if the positive power supply output current is greater than the negative power supply output current, the current flowing through the second transistor Q2 is the positive power supply current minus the negative power supply current, the first transistor Q1 is in a cut-off state, and the output voltage is the same as the output voltage when only the positive voltage output terminal O1 is connected to the load. If the negative power output current is greater than the positive power output current, the current flowing through the first transistor Q1 is the negative power supply current minus the positive power supply current, the second transistor Q2 is in a cut-off state, and the output voltage is the same as the output voltage when only the negative phase voltage output terminal O2 is connected to a load. If the positive power supply output current is equal to the negative power supply output current, the first triode Q1 and the second triode Q2 are both in a cut-off state, and the output voltage is Up.
The utility model provides a circuit of single winding generation positive negative pressure can be used to provide positive negative pressure drive power supply for machine controller, and preferably, the input voltage Uin that single winding generated is 15V, and when (IGBT direct) was led to in order to guarantee machine controller emergency discharge, do not harm the IGBT, need to generate stable positive phase voltage and be +10V, and negative phase voltage is-5V. When the diode and the triode are selected, the forward voltage drop of the diode is slightly smaller than the BE voltage drop of the triode, and the difference value of the voltage drops of the diode and the triode is the error between the actually output positive phase voltage and the required positive phase voltage.
The present invention has been described in detail with reference to the embodiments shown in the drawings, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.
Claims (10)
1. A circuit for generating positive and negative voltages with a single winding, comprising:
the precise voltage-stabilizing power supply circuit is connected to the positive-phase voltage input end and the negative-phase voltage input end and is used for converting the input voltage into the required positive-phase voltage and negative-phase voltage; and
a push-pull circuit connected to the positive phase voltage input end and the negative phase voltage input end and connected in parallel with the precision voltage regulator circuit, wherein the push-pull circuit comprises a first triode and a second triode,
the emitter of the first triode is connected with the emitter of the second triode and is connected with a grounding end;
the base electrode of the first triode is connected with the base electrode of the second triode and is connected with the precision voltage-stabilizing source circuit, the base electrode of the first triode is connected with the positive-phase voltage input end, and the base electrode of the second triode is connected with the negative-phase voltage input end;
the collector of the first triode is connected with the positive phase voltage input end and the positive phase voltage output end for outputting the required positive phase voltage, and the collector of the second triode is connected with the negative phase voltage input end and the negative phase voltage output end for outputting the required negative phase voltage.
2. The circuit for generating positive and negative voltages with a single winding according to claim 1, wherein the push-pull circuit further comprises a first diode and a second diode;
the anode of the first diode is connected with the base electrode of the first triode and the positive-phase voltage input end, and the cathode of the first diode is connected with the anode of the second diode and the precision voltage-stabilizing source circuit;
and the cathode of the second diode is connected with the base electrode of the second triode and the negative phase voltage input end.
3. The circuit for generating positive and negative voltages with a single winding as claimed in claim 2, wherein a first resistor is connected between the anode of said first diode and said positive voltage input terminal;
and a second resistor is connected between the cathode of the second diode and the negative phase voltage input end.
4. The circuit for generating positive and negative voltages with a single winding as claimed in claim 2, wherein the forward voltage drop of the first diode is smaller than the voltage drop of the base and the emitter of the first triode;
and the forward voltage drop of the second diode is smaller than the voltage drop of the base electrode and the emitter electrode of the second triode.
5. A circuit for generating positive and negative voltage by a single winding as claimed in claim 2 or 3, wherein said precision regulator circuit comprises a three-terminal adjustable shunt reference source, a third resistor, a fourth resistor and a fifth resistor;
the three-terminal adjustable shunt reference source comprises a first pin, a second pin and a third pin, and the first pin is connected with the positive-phase voltage input end;
the third resistor, the fourth resistor and the fifth resistor are connected in series, the third resistor is connected with the positive phase voltage input end, and the fifth resistor is connected with the negative phase voltage input end;
the second pin is connected between the third resistor and the fourth resistor;
the third pin is connected between the fourth resistor and the fifth resistor and is connected with the cathode of the first diode and the anode of the second diode.
6. The circuit for generating positive and negative voltages with a single winding as claimed in claim 1, wherein the collector of the first transistor is connected to a sixth resistor, and the sixth resistor is connected to the positive phase voltage input terminal and the positive phase voltage output terminal for outputting the required positive phase voltage;
and the collector of the second triode is connected with a seventh resistor, and the seventh resistor is connected with the negative phase voltage input end and the negative phase voltage output end for outputting the required negative phase voltage.
7. The circuit for generating positive and negative voltages with a single winding as claimed in claim 1, wherein a first capacitor is connected between said positive phase voltage input terminal and said negative phase voltage input terminal.
8. The circuit for generating positive and negative voltages with a single winding as claimed in claim 1, wherein a second capacitor is connected between said positive voltage output terminal and said ground terminal;
and a third capacitor is connected between the negative phase voltage output end and the grounding end.
9. The circuit for generating positive and negative voltages with a single winding of claim 1, wherein the positive phase voltage input terminal and the negative phase voltage input terminal are connected to a transformer with a single winding.
10. The circuit for generating positive and negative voltages with a single winding as claimed in claim 1, wherein said positive phase voltage output terminal and/or said negative phase voltage output terminal is connected to a load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020868662.1U CN211995170U (en) | 2020-05-21 | 2020-05-21 | Circuit for generating positive and negative voltage by single winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020868662.1U CN211995170U (en) | 2020-05-21 | 2020-05-21 | Circuit for generating positive and negative voltage by single winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211995170U true CN211995170U (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020868662.1U Active CN211995170U (en) | 2020-05-21 | 2020-05-21 | Circuit for generating positive and negative voltage by single winding |
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|---|---|
| CN (1) | CN211995170U (en) |
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2020
- 2020-05-21 CN CN202020868662.1U patent/CN211995170U/en active Active
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