CN210605505U - DC voltage stabilizing circuit, power circuit and intelligent circuit breaker controller - Google Patents
DC voltage stabilizing circuit, power circuit and intelligent circuit breaker controller Download PDFInfo
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- CN210605505U CN210605505U CN201921996039.8U CN201921996039U CN210605505U CN 210605505 U CN210605505 U CN 210605505U CN 201921996039 U CN201921996039 U CN 201921996039U CN 210605505 U CN210605505 U CN 210605505U
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Abstract
The utility model discloses a direct current voltage stabilizing circuit, the output is more stable. The circuit comprises first to fifth resistors, first to third switching tubes, a positive input end, a negative input end, a positive output end and a negative output end, and a voltage stabilizing tube; the first resistor and the voltage regulator tube are connected in series and then connected between the positive input end and the negative input end, the input end of the first switch tube is connected with the positive input end, the output end of the first switch tube is connected with the positive output end, the control end of the second switch tube is connected with the common end of the first resistor and the first voltage regulator tube, the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is connected with the output end of the third switch tube and then connected with the negative input end through the second resistor, the input end of the third switch tube is connected with the positive output end through the third resistor, the control end of the third switch tube is connected with the common end of the fourth resistor and the fifth resistor, the other ends of the fourth resistor and the fifth resistor are respectively connected with the positive output. The utility model also discloses a power supply circuit and a circuit breaker intelligent control ware.
Description
Technical Field
The utility model relates to a direct current voltage stabilizing circuit.
Background
In a low-voltage power distribution system, a circuit breaker is very commonly used, and the core of the circuit breaker is an intelligent controller which has important functions of signal sampling, data processing, electric quantity monitoring, circuit breaker tripping control and the like. In particular, the circuit breaker is controlled to be tripped, and in order to ensure that the circuit breaker can provide enough energy under various conditions to complete the tripping action, the circuit breaker controller also adopts an external power supply to supply power.
In the prior art, an external power supply generally employs a linear transformer to linearly step down a main loop AC power supply to obtain a lower AC voltage value (AC24V, AC36V, etc.), and then a power supply circuit inside a controller generates a working power supply required by the controller to operate the controller and a trip coil. A conventional power supply circuit is shown in fig. 1, and a regulator tube (triode) are used to implement dc voltage stabilization. By adopting the scheme, the tube voltage drop of the triode is influenced by the ambient temperature to change, so that the output voltage value is influenced by the ambient temperature to change, which is not desirable in practical application.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art not enough, provide an output voltage not influenced by ambient temperature undulant, export more stable direct current voltage stabilizing circuit.
The utility model discloses specifically adopt following technical scheme to solve above-mentioned technical problem:
a direct current voltage stabilizing circuit comprises first to fifth resistors, first to third switching tubes, a positive input end, a negative input end, a positive output end, a negative output end and a voltage stabilizing tube; the first resistor and the voltage-stabilizing tube are connected in series and then connected between the positive input end and the negative input end, the input end of the first switch tube is connected with the positive input end, the output end of the first switch tube is connected with the positive output end, the control end of the second switch tube is connected with the common end of the first resistor and the first voltage-stabilizing tube, the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is connected with the output end of the third switch tube and then connected with the negative input end through the second resistor, the input end of the third switch tube is connected with the positive output end through the third resistor, the control end of the third switch tube is connected with the common end of the fourth resistor and the fifth resistor, the other end of the fourth resistor is connected with the positive output end, the other end of the fifth.
Further preferably, a filter capacitor is connected between the positive and negative input terminals and/or between the positive and negative output terminals.
Further preferably, the negative input terminal and the negative output terminal are grounded.
On the basis of the technical scheme, the following technical scheme can be obtained:
a power supply circuit comprises a rectification circuit and a direct current voltage stabilizing circuit which are connected in sequence, wherein the direct current voltage stabilizing circuit adopts any one of the technical schemes.
The intelligent controller for the circuit breaker comprises a power circuit, wherein the power circuit adopts the technical scheme.
Compared with the prior art, the utility model discloses technical scheme has following beneficial effect:
the utility model discloses a circuit topology structure that switch tube and stabilivolt combined together has reduced the influence of temperature variation to output voltage to relatively lower cost has realized the high stable output of voltage, consequently has excellent output stability.
Drawings
FIG. 1 is a schematic circuit diagram of a conventional power circuit;
fig. 2 is a circuit schematic of a preferred embodiment of the power supply circuit of the present invention.
Detailed Description
The existing power circuit for the intelligent controller of the circuit breaker is shown in fig. 1, and is characterized in that after an external power is connected, the output voltage Vout value mainly depends on the resistance ratio of resistors R11 and R21 and the opening voltage value of the control end of a triode Q2, and when the temperature changes, the opening voltage of the control end of the triode Q2 also changes along with the change, so that the stability of the output voltage is affected.
The voltage stabilizing circuit that adopts the triode as the adjusting tube to have to be influenced by the ambient temperature change and make the unstable problem of output to prior art, the utility model discloses a solve the thinking and propose a direct current voltage stabilizing circuit topological structure who combines together switch tube and stabilivolt to the high stable output of voltage has been realized to relatively lower cost, because do not use the triode that easily receives the environmental impact, consequently voltage output can not produce undulantly along with temperature change, has excellent output stability.
Particularly, the utility model provides a direct current voltage stabilizing circuit, which comprises a first resistor, a second resistor, a third resistor, a positive input end, a negative input end, a positive output end, a negative output end and a voltage stabilizing tube; the first resistor and the voltage-stabilizing tube are connected in series and then connected between the positive input end and the negative input end, the input end of the first switch tube is connected with the positive input end, the output end of the first switch tube is connected with the positive output end, the control end of the second switch tube is connected with the common end of the first resistor and the first voltage-stabilizing tube, the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is connected with the output end of the third switch tube and then connected with the negative input end through the second resistor, the input end of the third switch tube is connected with the positive output end through the third resistor, the control end of the third switch tube is connected with the common end of the fourth resistor and the fifth resistor, the other end of the fourth resistor is connected with the positive output end, the other end of the fifth.
The technical solution of the present invention is further explained in detail by a specific embodiment with reference to the attached drawings:
the power circuit of the embodiment is shown in fig. 2 and is used for a breaker intelligent controller. As shown in fig. 2, the circuit includes a rectifier bridge D1, capacitors C1 and C2, resistors R1 to R5, switching tubes V1 to V3 (in this embodiment, switching transistors are used), and a voltage regulator tube W1. As shown in fig. 2, a positive output end of the rectifier bridge D1 is connected to a positive end of the capacitor C1, one end of the resistor R1 and an emitter of the switch tube V1, a negative output end of the rectifier bridge D1 is connected to a negative end of the capacitor C1, a positive electrode of the regulator tube W1, one end of the resistor R2, one end of the resistor R5 and a negative end of the capacitor C2, the other end of the resistor R1 is connected to a negative electrode of the regulator tube W1 and a base of the switch tube V2, a collector of the switch tube V2 is connected to a base of the switch tube V1, a collector of the switch tube V1 is connected to one end of the resistor R3, one end of the resistor R4 and a positive end of the capacitor C2, an emitter of the switch tube V2 is connected to the other end of the resistor R2 and an emitter of the switch tube V2, a collector of the switch tube V2 is connected to the other end of the resistor R2 and the other end. The resistor RL is a load. The specific working principle of the power supply circuit is as follows:
an external power supply enters a rectifier bridge D1 to perform full-wave rectification, a filter capacitor C1 filters the direct-current voltage output by the rectifier bridge D1, and a load resistor RL obtains the direct-current voltage Vdc _ out. When the external voltage rises, the output voltage Vdc _ in of the rectifier bridge rises, when the voltage value reaches the turn-on voltage of the voltage regulator tube W1, the voltage regulator tube W1 outputs a voltage value, when the voltage value is higher than the turn-on voltage Vbeo2 of the switch tube V2, the switch tube V2 is turned on, and at the moment, the output end of the switch tube V2 and the common end of the bias resistor R2 generate a comparison voltage Vcom. When the switch V2 is turned on, the switch V1 is also turned on, and the voltage value is outputted from the input terminal of the switch V1, that is, an output voltage Vdc _ out is obtained from the output terminal of the switch V1. At this time, according to the voltage division principle, a sampling voltage Vc is obtained at the common end of the resistor R4 and the resistor R5, and since Vdc _ out does not reach the preset value, the sampling voltage Vc is smaller than the comparison voltage Vcom at the offset resistor R2, and the switching tube V3 is in the off state.
When the access voltage is continuously increased to enable the voltage regulator tube W1 to output a stable voltage, the voltage output by the voltage regulator tube W1 is kept at a certain fixed value Vw, and at this time, the comparison voltage Vcom at the common end of the output end of the switch tube V2 and the bias resistor R2 is a fixed value, and Vcom is Vw-Vbeo 2. While Vdc _ out will continue to rise as the access voltage rises. The sampled voltage Vc obtained at the common terminal of the resistor R4 and the resistor R5 also increases as Vdc _ out increases. When the value of the sampled voltage Vc is greater than the fixed comparison voltage value Vcom, the switching tube V3 is turned on, the switching tube V2 is turned off and the switching tube V1 is turned off, the output voltage Vdc _ out is reduced, so that the sampled voltage Vc obtained at the common end of the resistor R4 and the resistor R5 is also reduced, when the value of the sampled voltage Vc is lower than the fixed comparison voltage value Vcom, the switching tube V3 is turned off, the switching tube V2 is turned on and the switching tube V1 is turned on, the output voltage Vdc _ out is increased, and the steps are repeated in a circulating manner, so that the output voltage Vdc _ out is finally stabilized at the preset voltage value. Different output voltage values can be obtained by adjusting the resistance values of the resistor R4 and the resistor R5.
When the access voltage is higher, the voltage stabilizing value of the voltage stabilizing tube W1 can be properly improved, the voltage drop of the bias resistor R1 is reduced, and the power consumption of the bias resistor R1 is effectively reduced. When the connected power supply voltage is direct current, the working principle of the circuit is the same as that described above.
When the ambient temperature changes, the turn-on voltage Vbeo2 of the switching tube V2 changes with the temperature change, and when the temperature rises, Vbeo2 falls, and Vcom is also increased as Vw-Vbeo 2. Since the switching tube V3 has the same temperature characteristics as the switching tube V2, the switching tube V3 turn-on voltage Vbeo3 also decreases with increasing temperature, i.e., Vbeo3 decreases, so Vc + Vbeo2 tends to be stable. As can be seen from the output voltage calculation formula Vdc _ out ═ Vc × (R4+ R5)/R5, Vc tends to be stable, and the output voltage Vdc _ out tends to be stable, i.e., is not affected by temperature changes.
Claims (5)
1. A direct current voltage stabilizing circuit is characterized by comprising first to fifth resistors, first to third switching tubes, a positive input end, a negative input end, a positive output end, a negative output end and a voltage stabilizing tube; the first resistor and the voltage-stabilizing tube are connected in series and then connected between the positive input end and the negative input end, the input end of the first switch tube is connected with the positive input end, the output end of the first switch tube is connected with the positive output end, the control end of the second switch tube is connected with the common end of the first resistor and the first voltage-stabilizing tube, the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is connected with the output end of the third switch tube and then connected with the negative input end through the second resistor, the input end of the third switch tube is connected with the positive output end through the third resistor, the control end of the third switch tube is connected with the common end of the fourth resistor and the fifth resistor, the other end of the fourth resistor is connected with the positive output end, the other end of the fifth.
2. The DC voltage regulator circuit of claim 1 wherein a filter capacitor is connected between the positive and negative input terminals and/or between the positive and negative output terminals.
3. The direct current voltage regulator circuit of claim 1 wherein the negative input terminal and the negative output terminal are coupled to ground.
4. A power supply circuit, comprising a rectification circuit and a direct current voltage stabilizing circuit which are connected in sequence, wherein the direct current voltage stabilizing circuit is the direct current voltage stabilizing circuit according to any one of claims 1 to 3.
5. A circuit breaker intelligent controller comprising a power circuit, wherein the power circuit is the power circuit of claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921996039.8U CN210605505U (en) | 2019-11-19 | 2019-11-19 | DC voltage stabilizing circuit, power circuit and intelligent circuit breaker controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921996039.8U CN210605505U (en) | 2019-11-19 | 2019-11-19 | DC voltage stabilizing circuit, power circuit and intelligent circuit breaker controller |
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| CN210605505U true CN210605505U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
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2019
- 2019-11-19 CN CN201921996039.8U patent/CN210605505U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
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