CN213402816U - Input slow starting circuit - Google Patents
Input slow starting circuit Download PDFInfo
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- CN213402816U CN213402816U CN202021980018.XU CN202021980018U CN213402816U CN 213402816 U CN213402816 U CN 213402816U CN 202021980018 U CN202021980018 U CN 202021980018U CN 213402816 U CN213402816 U CN 213402816U
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Abstract
The utility model discloses an input is starting circuit slowly, it includes rectifier bridge BD1, thermistor RT1, relay K1, triode V1, current-limiting resistor R1 and comparator N1, rectifier bridge BD 1's alternating current input termination alternating voltage, the positive input end of positive output termination DC/DC converter, negative output end is connected with the negative input end of DC/DC converter through thermistor RT1, relay K1's contact is parallelly connected with thermistor RT 1's contact, relay K1's coil is connected between triode V1's collecting electrode and power VCC, triode V1's projecting pole ground connection, the base is connected with comparator N1's output through current-limiting resistor R1, comparator N1 is positive, the negative input end connects sampling voltage and reference voltage respectively. The utility model discloses the reliability is high, and the practicality is strong, can effectively solve the problem that the power delays starting circuit consumption is big.
Description
Technical Field
The utility model belongs to the technical field of the power technique and specifically relates to an input slow start circuit is related to.
Background
In the power supply technology, an input slow start circuit is indispensable, and in a low-power supply, a single thermistor can be used as the slow start circuit. After the power supply normally works, the thermistor generates certain power consumption, and the low-power supply generally has small input current, so the part of power consumption can be ignored; however, in a medium-power and high-power supply, the requirement cannot be met by adopting a single thermistor slow start circuit.
Disclosure of Invention
In order to solve the above problems, the present invention provides an input slow start circuit with simple structure, easy implementation and low power consumption.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an input slow starting circuit comprises a rectifier bridge BD1, a thermistor RT1, a relay K1, a triode V1, a current limiting resistor R1 and a comparator N1, wherein an alternating current input end of the rectifier bridge BD1 is connected with an alternating current voltage, a positive output end is connected with a positive input end of a DC/DC converter, a negative output end is connected with a negative input end of the DC/DC converter through the thermistor RT1, a contact of the relay K1 is connected with a contact of the thermistor RT1 in parallel, a coil of the relay K1 is connected between a collector of the triode V1 and a power supply VCC, an emitter of the triode V1 is grounded, a base is connected with an output end of the comparator N1 through the current limiting resistor R1, and positive and negative input ends of the comparator N1 are respectively connected with a sampling voltage and a reference voltage.
Furthermore, a diode D1 is connected in parallel to two ends of the coil of the relay K1, and the anode of the diode D1 is connected to the collector of the transistor V1.
Further, the transistor V1 is an NPN transistor.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the input slow starting circuit is simple in circuit design, few in components, easy to achieve, low in manufacturing cost, high in reliability and strong in practicability, can effectively solve the problem that the power consumption of the power supply slow starting circuit is large, and has wide application prospects in the field of power supply application.
Drawings
Fig. 1 is a schematic diagram of the input slow start circuit of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the input slow start circuit includes a rectifier bridge BD1, a thermistor RT1, a relay K1, a triode V1, a current limiting resistor R1 and a comparator N1, wherein an ac input terminal of the rectifier bridge BD1 is connected to an ac voltage, a positive output terminal is connected to a positive input terminal (DC +) of a DC/DC converter, a negative output terminal is connected to a negative input terminal (DC-) of the DC/DC converter through the thermistor RT1, a contact of the relay K1 is connected in parallel with a contact of the thermistor RT1, a coil of the relay K1 is connected between a collector of the triode V1 and a power source VCC, a diode D1 is connected in parallel with two ends of the coil of the relay K1, the anode of the diode D1 is connected to the collector of the transistor V1, the emitter of the transistor V1 is grounded, the base is connected to the output terminal (OUT) of the comparator N1 through the current limiting resistor R1, and the positive and negative input terminals of the comparator N1 are connected to the sampling voltage and the reference voltage, respectively.
The transistor V1 is an NPN transistor.
The comparator N1 is model LM 158.
The utility model discloses input slow start circuit, its theory of operation is: alternating current input voltage is rectified and converted into a direct current signal through a rectifier bridge BD1 and is output to a DC/DC converter, a large surge current is generated at the moment of voltage input, and at the moment, the thermistor RT1 plays an instant buffer role, namely, slow start; but after the slow start, the thermistor RT1 still consumes some power in the circuit and generates a lot of heat.
At the moment, the direct current voltage is normally input to the DC/DC converter, a DC + sampling voltage signal is compared with a reference voltage to enable the comparator N1 to turn over, a high level is output and is output to the base electrode of the triode V1 after passing through the current limiting resistor R1, the collector electrode and the emitter electrode of the V1 are conducted and are directly connected to a ground signal, namely, the coil of the relay K1 is normally powered, the pin of the relay K1 is conducted to a normally open contact (pin 3) from a normally closed contact (pin 2), the thermistor RT1 is short-circuited, and the input slow start circuit completes work; meanwhile, the thermistor RT1 is switched out of the circuit, and the slow start power consumption is reduced to almost zero.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. An input slow start circuit is characterized in that: the direct current voltage source comprises a rectifier bridge BD1, a thermistor RT1, a relay K1, a triode V1, a current-limiting resistor R1 and a comparator N1, wherein the alternating current input end of the rectifier bridge BD1 is connected with alternating current voltage, the positive output end of the rectifier bridge BD1 is connected with the positive input end of a DC/DC converter, the negative output end of the rectifier bridge BD 632 is connected with the negative input end of the DC/DC converter through the thermistor RT1, the contact point of the relay K1 is connected with the contact point of the thermistor RT1 in parallel, the coil of the relay K1 is connected between the collector electrode of the triode V1 and a power source VCC, the emitter electrode of the triode V1 is grounded, the base electrode of the triode V1 is connected with the output end of the comparator N1.
2. The input slow start circuit according to claim 1, wherein: the two ends of the coil of the relay K1 are connected in parallel with a diode D1, and the anode of the diode D1 is connected with the collector of a triode V1.
3. The input slow start circuit according to claim 1, wherein: the triode V1 is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021980018.XU CN213402816U (en) | 2020-09-11 | 2020-09-11 | Input slow starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021980018.XU CN213402816U (en) | 2020-09-11 | 2020-09-11 | Input slow starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213402816U true CN213402816U (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021980018.XU Active CN213402816U (en) | 2020-09-11 | 2020-09-11 | Input slow starting circuit |
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| CN (1) | CN213402816U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115102379A (en) * | 2021-12-17 | 2022-09-23 | 沈阳新松机器人自动化股份有限公司 | Soft start control circuit and method applied to inductive load |
-
2020
- 2020-09-11 CN CN202021980018.XU patent/CN213402816U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115102379A (en) * | 2021-12-17 | 2022-09-23 | 沈阳新松机器人自动化股份有限公司 | Soft start control circuit and method applied to inductive load |
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