CN201490694U

CN201490694U - Excitation protecting circuit of voltage regulator of generator set

Info

Publication number: CN201490694U
Application number: CN2009201902591U
Authority: CN
Inventors: 高玉海
Original assignee: MENG RONGSHUI
Current assignee: MENG RONGSHUI
Priority date: 2009-08-06
Filing date: 2009-08-06
Publication date: 2010-05-26
Anticipated expiration: 2019-08-06

Abstract

The utility model mainly discloses an excitation protecting circuit of a voltage regulator of a generator set, wherein the excitation protecting circuit is connected on the control end of an output power tube between an excitation power and a capacitive load circuit; the excitation protecting circuit comprises a trigger signal input terminal; and the excitation protecting circuit is switched on under the trigger of a signal, and the on/off of the excitation protecting circuit control the on/off of the output of excitation current. The excitation protecting circuit can realize automatic control and protection on the excitation power output of the generator set.

Description

The excitation protection circuit of generating set voltage regulator

Technical field

The utility model relates to the partial circuit on the generator, and is special relevant with the excitation protection circuit of generating set voltage regulator.

Background technology

The voltage regulator of generating set generally adopts the transistor voltage regulator, is connected between field power supply and the capacitive load circuit, adjusts the electric current, voltage and the power that are added in the load.

But the generating set voltage regulator often is operated in the environment of very severe, and, generator failure low excessively such as the condition of high temperature, generating set overload, rotating speed etc. cause damage all can for the generating set voltage regulator.Make that finally the output voltage of generating set is out of control, might become harm the user.So the reliability of electronic pressure controller is very important in the raising generating set.

Given this, the inventor designs a kind of excitation protection circuit of generating set voltage regulator, and this case produces thus.

The utility model content

The purpose of this utility model is to provide the excitation protection circuit of generating set voltage regulator, realizes automatic control and protection to the output of generating unit excitation power supply.

To achieve these goals, solution of the present utility model is:

The excitation protection circuit of generating set voltage regulator; on the control end of the power output pipe between field power supply and the capacitive load circuit, be connected with the excitation protection circuit; the excitation protection circuit has the triggering signal input; excitation protection circuit turn-on under signal triggering, the opening and closing of the conducting of excitation protection circuit and the output of disconnection control exciting current.

The excitation protection circuit of described generating set voltage regulator is made of transistor, field effect transistor, controllable silicon or combining form.

The excitation protection circuit of described generating set voltage regulator has the temperature protection circuit that is made of thermistor.

The excitation protection circuit of described generating set voltage regulator has external interface circuit, forms the logic OR relation with the excitation protection circuit.

The excitation protection circuit of described generating set voltage regulator also has the speed protection circuit, and the conducting time-delay is provided, and realizes the low speed protection.

The excitation protection circuit of described generating set voltage regulator has current foldback circuit, is connected on the excitation main circuit of generating set voltage regulator, and the excessive conducting excitation protection of exciting current circuit makes the output of exciting current close.

After adopting such scheme, the conducting that the utility model can be by the excitation protection circuit and disconnect the output of controlling field power supply.

In addition, temperature protection circuit, speed protection circuit and current foldback circuit can also carry out better protection control to voltage regulator.External interface circuit can also connect outside control circuit, makes that generating set voltage regulator control forms is various.

Description of drawings

Fig. 1 is the control circuit figure of the utility model preferred embodiment;

Fig. 2 is the other forms of schematic diagram of output power circuit Q1;

Fig. 3 is the other forms of schematic diagram of excitation protection circuit P1;

Fig. 4 is the schematic diagram of the another kind of form of temperature protection circuit P2;

Fig. 5 is the waveform schematic diagram of M point and voltage stabilizing didoe D2.

Embodiment

As shown in Figure 1, be wherein a kind of preferred embodiment of the present utility model, have excitation protection circuit P1, temperature protection circuit P2, external interface circuit P3, speed protection circuit P4, current foldback circuit P5.

Wherein, sample circuit F1, capacitive load circuit F2, field power supply F3 are the former functional module of generating set voltage regulator, power output pipe Q1, transistor Q4, inductance M1 and resistance R 1 also are the elements that is possessed in the generating set voltage regulator, and the key element relevant with this patent.The form of power output pipe Q1 also is not limited to the employing single transistor, can also be other forms of structure, and four kinds of power output pipes as shown in Figure 2 are other form equivalent electric circuits that arrive commonly used in the generating set voltage regulator.Certainly, this non-protection category of the present utility model is not done and is given unnecessary details.

Excitation protection circuit P1 in the present embodiment, it is that the emitter of transistor Q2 is connected on the power output pipe Q1 by a PNP transistor Q2 and the circuit that NPN transistor Q3 combines, the emitter of transistor Q3 is connected on the field power supply F3.Simultaneously, the base stage of transistor Q2 and collector electrode are connected collector electrode and the base stage of transistor Q3 respectively, and the base stage of the base stage of transistor Q2 and transistor Q3 forms two triggering signal inputs, is respectively G2 and G1.

Excitation protection circuit P1 has auto-lock function, and this circuit is connected on the control end or other equivalent electric circuit of power output pipe Q1, is used to control conducting and the disconnection of power output pipe Q1.After in a single day excitation protection circuit P1 is triggered, even the state after the triggering signal disappearance also can keep triggering.

Excitation protection circuit P1 also adopts other circuit forms of same principle:

A. a controllable silicon (as the P1-A of Fig. 3);

B.P type field effect transistor and N type field effect transistor are formed (as the P1-B of Fig. 3);

C. field effect transistor and transistor are formed (as P1-C and the P1-D of Fig. 3).

In conjunction with Fig. 1, the temperature protection circuit P2 of present embodiment is to be in series by resistance R 3 and thermistor R6 again, and the serial connection point connects the triggering signal input G2 of excitation protection circuit P1.Its cardinal principle is to be detected the temperature of voltage regulator by thermistor R6; when variations in temperature; thermistor R6 change in resistance; resistance R 3 of then connecting and the partial pressure value of thermistor R6 also respective change with thermistor R6; when reaching a certain temperature; voltage on the resistance R 3 just in time can trigger excitation protection circuit P1, produces protection.

Based on this principle, temperature protection circuit P2 also can use the circuit of the thermistor of positive temperature coefficient, referring to Fig. 4.

The external interface circuit P3 of present embodiment is made up of a diode D4, and it and excitation protection circuit P1 form logic OR, for the external control circuit of voltage regulator provides an interface.

During voltage regulator operation, on the tie point M of resistance R 1, power output pipe Q1 and transistor Q4, produce square wave, its cycle and generator output voltage cycle proportional, its duty of ratio depends on the size of exciting voltage, electric current, its amplitude is constant substantially.Because the decision of the principle of voltage regulator during operate as normal, is in the square wave state, all the time in case the whole conductings of power output pipe Q1 then will lose pressure stabilization function.

Therefore present embodiment also has speed protection circuit P4, comprises resistance R 2, capacitor C 2, diode D1 and voltage stabilizing didoe D2.Wherein resistance R 2, capacitor C 2, diode D1 and voltage stabilizing didoe D2 form a delay circuit, and voltage stabilizing didoe D2 is a benchmark.

In conjunction with Fig. 5, when the square wave on the M point is in high level, charge to capacitor C 2 by resistance R 2, and long more voltage of time is high more.

Be charged to t1 during the moment, the M point becomes low level, and capacitor C 2 restPoses by diode D1 repid discharge.

Because rotating speed reduces, the pulse period that M is ordered is elongated, and when the charging interval, length was to t2, when capacitor C 2 voltages reached the reference voltage of voltage stabilizing didoe D2, voltage stabilizing didoe D2 began conducting, and triggers excitation protection circuit P1, realizes slow-speed of revolution protection.

Current foldback circuit P5 in the present embodiment is connected on the triggering signal input G1 of excitation protection circuit P1; form by resistance R 5, R4 and capacitor C 1; wherein the core is a resistance R 5; it is connected in the excitation main circuit; be used for detecting exciting current, resistance R 4 and capacitor C 1 are the anti-jamming circuits of establishing in order to prevent misoperation.

Because generating set overload; or electrical fault, need voltage regulator that very big exciting current is provided, the pressure drop that produces on resistance R 5 when electric current surpasses the given trigger voltage of excitation protection circuit P1; then trigger excitation protection circuit P1, realize the exciting current overcurrent protection by triggering signal input G1.

Claims

1. the excitation protection circuit of generating set voltage regulator; it is characterized in that: on the control end of the power output pipe between field power supply and the capacitive load circuit, be connected with the excitation protection circuit; the excitation protection circuit has the triggering signal input; excitation protection circuit turn-on under signal triggering, the opening and closing of the conducting of excitation protection circuit and the output of disconnection control exciting current.

2. the excitation protection circuit of generating set voltage regulator according to claim 1, it is characterized in that: the excitation protection circuit is made of transistor, field effect transistor, controllable silicon or combining form.

3. the excitation protection circuit of generating set voltage regulator as claimed in claim 1 or 2 is characterized in that: it is characterized in that: also have the temperature protection circuit that is made of thermistor.

4. the excitation protection circuit of generating set voltage regulator as claimed in claim 1 or 2 is characterized in that: have external interface circuit, form the logic OR relation with the excitation protection circuit.

5. the excitation protection circuit of generating set voltage regulator as claimed in claim 1 or 2 is characterized in that: also have the speed protection circuit, the conducting time-delay is provided, realize the low speed protection.

6. the excitation protection circuit of generating set voltage regulator as claimed in claim 1 or 2; it is characterized in that: have current foldback circuit; be connected on the excitation main circuit of generating set voltage regulator, the excessive conducting excitation protection of exciting current circuit makes the output of exciting current close.