CN214014109U - Positive and negative output enable switching circuit - Google Patents
Positive and negative output enable switching circuit Download PDFInfo
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- CN214014109U CN214014109U CN202022761078.9U CN202022761078U CN214014109U CN 214014109 U CN214014109 U CN 214014109U CN 202022761078 U CN202022761078 U CN 202022761078U CN 214014109 U CN214014109 U CN 214014109U
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Abstract
The utility model discloses a positive and negative output enable switching circuit, which comprises an enable input drive circuit, a power conversion circuit, a control circuit, an output positive and negative voltage switching circuit and an output circuit which are connected in sequence; the enable input driving circuit is connected with the control input end of the power conversion circuit; the output end of the power conversion circuit is connected with the output circuit and used for supplying power to the output circuit; the control circuit is connected with the output circuit through the positive and negative voltage output switching circuit. The utility model discloses an enable control realizes exporting positive and negative voltage switching, and the response is fast, exports reliable and stable voltage.
Description
Technical Field
The utility model belongs to the technical field of the circuit, especially, relate to a positive negative output enables switching circuit.
Background
The conventional DC/DC conversion component generally outputs constant voltage and constant power, the switching of the output voltage between positive output and negative output requires external complex switch control, the control response time is long, the circuit is complex and high in cost, and automatic switching regulation cannot be realized.
SUMMERY OF THE UTILITY MODEL
The present invention aims to solve the above problems and provide a positive/negative output enable switching circuit, which comprises an enable input driving circuit, a power conversion circuit, a control circuit, an output positive/negative voltage switching circuit and an output circuit connected in sequence; the enable input driving circuit is connected with the control input end of the power conversion circuit; the output end of the power conversion circuit is connected with the output circuit and used for supplying power to the output circuit; the control circuit is connected with the output circuit through the positive and negative voltage output switching circuit.
The beneficial effects of the utility model reside in that: the utility model discloses an enable control realizes exporting positive and negative voltage switching, and the response is fast, exports reliable and stable voltage.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a circuit diagram of an enable input driver circuit;
fig. 4 is a circuit diagram of a power conversion circuit;
FIG. 5 is a circuit diagram of the output positive and negative voltage switching circuit connected to the output circuit;
fig. 6 is a circuit diagram of the 555 timer.
In the figure: r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; c1 — first capacitance; c2 — second capacitance; c3 — third capacitance; q1-first triode; q2-second transistor; v1 — first zener diode; a TVS-TVS tube; N1-AND gate; n2-inverter; n3 — first driver; n4 — second driver; n5-voltage converter; n6-555 timer.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the present invention relates to a positive/negative output enable switching circuit, which comprises an enable input driving circuit, a power conversion circuit, a control circuit, an output positive/negative voltage switching circuit and an output circuit, which are connected in sequence; the enable input driving circuit is connected with the control input end of the power conversion circuit; the output end of the power conversion circuit is connected with the output circuit and used for supplying power to the output circuit; the control circuit is connected with the output circuit through the positive and negative voltage output switching circuit.
Specifically, as shown in fig. 3, the enable input driving circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a TVS tube, a first zener diode, a first triode, a second triode, a first dc power supply, and a first diode; the input end of the enable input driving circuit is connected with the first end of the first resistor and the first end of the TVS tube; the second end of the first resistor is connected with the anode of the first diode and the first end of the first capacitor; the cathode of the first diode is connected with the first end of the second resistor, the first end of the second capacitor and the base of the first triode; the first direct current power supply is connected with a collector of the first triode, a cathode of the first voltage stabilizing diode, a first end of the fourth resistor, a first end of the third capacitor and a base of the second triode through the third resistor; the second triode is connected with the output end of the enable input driving circuit; the second end of the TVS tube, the second end of the first capacitor, the second end of the second resistor, the second end of the second capacitor, the emitter of the first triode, the anode of the first voltage stabilizing diode, the second end of the fourth resistor, the second end of the third capacitor and the emitter of the second triode are grounded.
Specifically, as shown in fig. 2, the power conversion circuit includes a voltage converter; the output circuit comprises a first output circuit and a second output circuit; the enabling input driving circuit is connected with the first output circuit and the second output circuit through the voltage converter.
Specifically, the control circuit comprises a 555 timer.
Specifically, the output positive and negative voltage switching circuit comprises a logic unit and an inverter; the output circuit comprises a first driver and a second driver; the control circuit is connected with the input end of the first driver through the logic unit; the controller is connected with the input end of the second driver through the inverter.
Specifically, the logic unit is an and gate module.
As shown in the circuit diagram of the power conversion circuit of fig. 4. As shown in fig. 5, the PWM signal is sent from the control circuit through the and gate and the inverter to the two-way driver.
The control circuit adopts a 555 timer, as shown in fig. 6, the 555 timer works to generate a switching frequency, and the positive and negative voltage switching circuit is controlled to be output after the frequency is conditioned. The power change module adopts a voltage converter for realizing stable voltage output. The output voltage powers the driver. The input signal enabling the input drive circuit is provided with a TTL level by the control circuit or an external system. The switch of the power conversion module is controlled after the enable input drive circuit adjusts the enable signal, so that the purpose of controlling output is achieved.
The TVS tube absorbs instantaneous large current and high voltage clamping, and plays a role in circuit protection.
The utility model discloses an enable control realizes exporting positive and negative voltage switching, and the response is fast, can export reliable and stable voltage.
The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.
Claims (6)
1. A positive and negative output enable switching circuit is characterized by comprising an enable input drive circuit, a power conversion circuit, a control circuit, an output positive and negative voltage switching circuit and an output circuit which are sequentially connected; the enable input driving circuit is connected with the control input end of the power conversion circuit; the output end of the power conversion circuit is connected with the output circuit and used for supplying power to the output circuit; the control circuit is connected with the output circuit through the positive and negative voltage output switching circuit.
2. The positive-negative output enable switching circuit according to claim 1, wherein the enable input driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a TVS transistor, a first voltage regulator diode, a first triode, a second triode, a first dc power supply and a first diode; the input end of the enable input driving circuit is connected with the first end of the first resistor and the first end of the TVS tube; the second end of the first resistor is connected with the anode of the first diode and the first end of the first capacitor; the cathode of the first diode is connected with the first end of the second resistor, the first end of the second capacitor and the base of the first triode; the first direct current power supply is connected with a collector of the first triode, a cathode of the first voltage stabilizing diode, a first end of the fourth resistor, a first end of the third capacitor and a base of the second triode through the third resistor; the second triode is connected with the output end of the enable input driving circuit; the second end of the TVS tube, the second end of the first capacitor, the second end of the second resistor, the second end of the second capacitor, the emitter of the first triode, the anode of the first voltage stabilizing diode, the second end of the fourth resistor, the second end of the third capacitor and the emitter of the second triode are grounded.
3. The positive-negative output enable switching circuit according to claim 1, wherein the power conversion circuit includes a voltage converter; the output circuit comprises a first output circuit and a second output circuit; the enabling input driving circuit is connected with the first output circuit and the second output circuit through the voltage converter.
4. The positive-negative output enable switching circuit according to claim 1, wherein the control circuit comprises a 555 timer.
5. The positive-negative output enable switching circuit according to claim 1, wherein the output positive-negative voltage switching circuit comprises a logic unit and an inverter; the output circuit comprises a first driver and a second driver; the control circuit is connected with the input end of the first driver through the logic unit; the controller is connected with the input end of the second driver through the inverter.
6. The positive-negative output enable switching circuit according to claim 5, wherein the logic unit is an AND gate module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022761078.9U CN214014109U (en) | 2020-11-25 | 2020-11-25 | Positive and negative output enable switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022761078.9U CN214014109U (en) | 2020-11-25 | 2020-11-25 | Positive and negative output enable switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214014109U true CN214014109U (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022761078.9U Active CN214014109U (en) | 2020-11-25 | 2020-11-25 | Positive and negative output enable switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214014109U (en) |
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2020
- 2020-11-25 CN CN202022761078.9U patent/CN214014109U/en active Active
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