CN101540249B - Creepage breaker - Google Patents

Abstract

The invention provides a creepage breaker which can supply stable power to a creepage detection circuit and a tripping device and at the same time reaflize stable test action. The creepage breaker is provided with a full-wave rectifying circuit formed by bridging a rectifying diode used for rectifying alternative voltage of a main circuit; a power source circuit supplying reduced output of the full-wave rectifying circuit to the creepage detection circuit and the tripping device; a test circuit testing electrifying current or applied voltage of at least a rectifying diode in a plurality of rectifying diodes of the full-wave rectifying circuit so as to generate test current with phase thereof synchronous with that of alternative current passing through the main circuit and supplying the test current to a third winding of a zero-phase current transformer.

Description

RCCB

Technical field

The present invention relates to a kind of RCCB, flow in the alternating current circuits such as its detection distribution system

The leakage current of crossing, and cut off alternating current circuit, prevent the electric leakage accident.

Background technology

As everyone knows, RCCB has following part etc., that is: main circuit, and it is connected with alternating current circuit; Switch portion, it possesses makes this main circuit connect the switching mechanism that breaks off; Electric-leakage detection circuit, the leakage current of main circuit is flow through in its detection; Tripgear when it detects leakage current at electric-leakage detection circuit, trips and the cut-out main circuit switching mechanism of switch portion; And test circuit, it makes measuring current flow through electric-leakage detection circuit and carries out the confirming operation of leakage tripping function.

Existing common RCCB constitutes: the power supply that obtains electric-leakage detection circuit and tripgear from 2 circuitry phases of main circuit; And the alternating voltage before the rectification of 2 phases of main circuit obtains the power supply of test circuit, makes to flow through in the test circuit through resistance based on power supply and suppresses the measuring current (for example with reference to patent documentation 1) for setting.

In addition; Another kind of existing RCCB constitutes: supply with from the power supply of accepting electric-leakage detection circuit and tripgear as all three-phase circuits of main circuit; And will be to being applied to that three-phase alternating voltage on the three-phase circuit carries out rectification and the direct voltage that obtains as power supply, make and flow through in the test circuit that to be suppressed by resistance be the measuring current of setting, utilize the fluctuation composition of this measuring current to make the electric-leakage detection circuit action; Thus; Even owe mutually also can keep creepage protection function under the state of phase 1, and then can carry out test action (for example, with reference to patent documentation 2).

In addition; Another kind of existing RCCB constitutes: accept the power supply supply of electric-leakage detection circuit and tripgear from all three-phase circuit integral body of main circuit, with patent documentation 2 likewise, even owe mutually also can keep creepage protection function and test action under the state of phase 1; Simultaneously; In this RCCB, low-frequency oscillator is set, uses the output current of this oscillator to flow into test circuit, wherein as measuring current; The direct voltage that this low-frequency oscillator uses the three-phase alternating voltage with three-phase circuit to carry out obtaining after the full-wave rectification moves (for example, with reference to patent documentation 3) as power supply.

Patent documentation 1: the spy opens flat 5-182579 communique

Patent documentation 2: the spy opens the 2007-149603 communique

Patent documentation 3: the spy opens the 2006-302601 communique

Summary of the invention

Under the situation of the existing RCCB of in patent documentation 1, putting down in writing; Even because under the situation about in three-phase circuit, using; Also 2 carrying out power supply mutually and supply with from three-phase only so owe phase time as any of this 2 phase, might be lost creepage protection function.In addition; Owing to apply main circuit voltage to following resistance and Test Switchboard, therefore must guarantee the dielectric voltage withstand of this resistance and Test Switchboard, test circuit is difficult to miniaturization; Wherein, this resistance is used for the measuring current that flows through test circuit is restricted to the predetermined electric current value.

In addition; Under the situation of the existing RCCB of in the 1st execution mode of patent documentation 2, putting down in writing; Be main with flip-flop in the measuring current, alternating component is few, thereby the output from zero phase current transformer that utilizes this measuring current to produce; Compare very for a short time with the output of the zero phase current transformer that utilizes common sine wave alternating current stream, must be used in the measuring current of carrying out test action is very large electric current.In addition, measuring current is the electric current that obtains behind the three phase full wave rectification, becomes higher harmonic current 3 times, has 3 times of fundamental frequencies to the main circuit frequency.There is following problems in its result, owing to be arranged at the influence that being used in the electric-leakage detection circuit remove the low pass filter of high order harmonic component usually, must make the required measuring current of test action be bigger electric current.

In addition; Under the situation of the existing RCCB of in the 2nd execution mode of patent documentation 2, putting down in writing; The fundamental frequency of measuring current is identical with the frequency of main circuit current, and it is very big that the alternating component of measuring current also becomes, but the voltage after the rectification become must have 1 owe phase mutually rectified waveform; For with its power supply, need carry out level and smooth fully as electric-leakage detection circuit.In addition; Owing to used half-wave rectifying circuit; 2 rectifier diodes that only are arranged in the one-sided bridge arm can't suppress back voltage; Therefore there is following problems, must respectively overvoltage be suppressed, perhaps select the very high rectifier diode of resistance to pressure to the surge absorber etc. of respectively using mutually of AC side.

In addition; The problem that in the existing RCCB of patent documentation 3 records, exists is; Under the nonsynchronous situation of phase place of the phase place of main circuit current and the measuring current that produces by oscillator; Deviation can take place in the time of detecting electric leakage; Perhaps in main circuit, flow through under the state of the leakage current often that still is unlikely to cause the leakage tripping degree and carry out under the situation of test action, measuring current and often produce fluctuation (pulsation) in the resultant current of leakage current makes the confirming operation that utilizes the leakage tripping function that measuring current the carries out instability that becomes.

The present invention proposes in order to address the above problem, and its objective is to obtain a kind of RCCB, and it can supply with stable power to electric-leakage detection circuit and tripgear, simultaneously, can realize stable test action.

RCCB involved in the present invention is characterized in that, has: main circuit, and it is connected with alternating current circuit; Switch portion, it makes above-mentioned main circuit connect disconnection; Zero phase current transformer, it has secondary winding and three windings, and this secondary winding generates output current based on the leakage current that flows through in the above-mentioned main circuit, and these three windings make when being applied with measuring current and produce output current in the above-mentioned secondary winding; Test circuit, it supplies with above-mentioned measuring current to above-mentioned three windings when test operation; Electric-leakage detection circuit, it is based on the output current of the secondary winding of above-mentioned zero phase current transformer and generate the output signal; Tripgear, it is driven based on the output signal of above-mentioned electric-leakage detection circuit, makes above-mentioned switch portion tripping operation, thereby cuts off above-mentioned main circuit; Power circuit, it is to above-mentioned electric-leakage detection circuit and above-mentioned tripgear supply capability; And full-wave rectifying circuit; Its a plurality of rectifier diodes by bridge joint constitute; Alternating voltage to being applied on the above-mentioned main circuit carries out full-wave rectification and output dc voltage; Above-mentioned power circuit is accepted from the supply of the above-mentioned direct voltage of above-mentioned full-wave rectifying circuit output; And the direct-current control voltage of the regulation that is generated supplied to above-mentioned electric-leakage detection circuit and above-mentioned tripgear; Above-mentioned test circuit is through to the electrical current of at least one rectifier diode in the above-mentioned a plurality of rectifier diodes that constitute above-mentioned full-wave rectifying circuit or apply voltage and detect, and generates the phase locked electric current of the alternating current that flows through in phase place and the above-mentioned main circuit, and the electric current that is generated is supplied to above-mentioned three windings as above-mentioned measuring current.

In the present invention, " electric leakage " comprises ground connection, and " leakage current " comprises earth current.

The effect of invention

According to RCCB involved in the present invention; Power circuit is accepted from the supply of the direct voltage of full-wave rectifying circuit output; And the direct-current control voltage of the regulation that will generate supplies to electric-leakage detection circuit and tripgear; Test circuit is through to the electrical current of at least one rectifier diode in a plurality of rectifier diodes that constitute full-wave rectifying circuit or apply voltage and detect; And generate the phase locked electric current of the alternating current that flows through in phase place and the main circuit, the electric current that is generated is supplied to three windings of zero phase current transformer as measuring current, therefore; Can obtain the action of stable electric-leakage detection circuit and tripgear, carry out stable test action simultaneously.

Description of drawings

Fig. 1 is the circuit diagram of the related RCCB of expression the 1st execution mode of the present invention.

Fig. 2 is the oscillogram of the waveform of the electric current that flows through in the rectifier diode of the related RCCB of expression the 1st execution mode of the present invention.

Fig. 3 is the oscillogram of the related RCCB waveform of each several part in the test action under the normal condition of expression the 1st execution mode of the present invention.

To be the related RCCB of expression the 1st execution mode of the present invention owe under the state of phase the oscillogram of the waveform of each several part in the test action at R to Fig. 4 mutually.

To be the related RCCB of expression the 1st execution mode of the present invention owe under the state of phase the oscillogram of the waveform of each several part in the test action at S to Fig. 5 mutually.

To be the related RCCB of expression the 1st execution mode of the present invention owe under the state of phase the oscillogram of the waveform of each several part in the test action at T to Fig. 6 mutually.

Fig. 7 is the circuit diagram of the related RCCB of expression the 2nd execution mode of the present invention.

Fig. 8 is the circuit diagram of the related RCCB of expression the 3rd execution mode of the present invention.

Fig. 9 is the circuit diagram of the related RCCB of expression the 4th execution mode of the present invention.

Figure 10 is the oscillogram of the related RCCB waveform of each several part in the test action under the normal condition of expression the 4th execution mode of the present invention.

To be the related RCCB of expression the 4th execution mode of the present invention owe under the state of phase the oscillogram of the waveform of each several part in the test action at R to Figure 11 mutually.

To be the related RCCB of expression the 4th execution mode of the present invention owe under the state of phase the oscillogram of the waveform of each several part in the test action at S to Figure 12 mutually.

To be the related RCCB of expression the 4th execution mode of the present invention owe under the state of phase the oscillogram of the waveform of each several part in the test action at T to Figure 13 mutually.

Figure 14 is the circuit diagram of the related RCCB of expression the 5th execution mode of the present invention.

Figure 15 is the circuit diagram of the related RCCB of expression the 6th execution mode of the present invention.

Embodiment

The 1st execution mode.

Fig. 1 is the circuit diagram of the related RCCB of expression the 1st execution mode of the present invention.Among Fig. 1, RCCB 1 has: main circuit 4, and it is made up of the R phase that mains side splicing ear 2 is connected with load-side splicing ear 3, S phase, each circuit of T phase; Switch portion 5, it makes this main circuit 4 connect disconnection; Zero phase current transformer 6, its conductor by all phases of main circuit 4 runs through, and detects the electric leakage flow through main circuit 4 or ground fault electric current (below, be referred to as leakage current) and detects electric current from secondary winding 6a output; Electric-leakage detection circuit 7, it keeps watch on the detection electric current of the secondary winding 6a of this zero phase current transformer 6, thereby judges and have or not electric leakage or ground connection (below be referred to as electric leakage); Power circuit 9, it is to tripgear 8 and electric-leakage detection circuit 7 supply capabilities, and this tripgear 8 output signal according to electric-leakage detection circuit 7 when electric leakage takes place trips the switching mechanism of switch portion 5, thereby cuts off main circuit 4; And after state test circuit.RCCB 1 is connected with the three-phase circuit (not shown) that will carry out detection of electrical leakage with load-side splicing ear 3 through mains side splicing ear 2.

The three-phase full wave rectifier circuit 10 that is arranged in the RCCB 1 is made up of 6 rectifier diode D 1, D2, D3, D4, D5, D6, and the three-phase alternating voltage of main circuit 4 is carried out rectification and to power circuit 9 supply capabilities.In addition, the AC side of three-phase full wave rectifier circuit 10 via impedance component 11 respectively with the R of main circuit 4 mutually, S phase, T mutually each circuit connect, DC side is connected with voltage suppression element 12.

Voltage suppression element 12 and 2 rectifier diode D1 and D4, D2 and D5, D3 and D6 are connected in parallel respectively; Above-mentioned 2 rectifier diodes constitute the side of the positive electrode bridge arm and the negative side bridge arm of each phase of three-phase full wave rectifier circuit 10 respectively; This voltage suppression element 12 is with respect to overvoltage such as surge or impacts; The back voltage of these 6 rectifier diode D1～D6 suppresses to all, in addition, protects in the internal circuit integral body of interior RCCB 1 comprising three-phase full wave rectifier circuit 10.

Power circuit 9 is accepted to carry out full-wave rectification and the supply of the direct voltage VD that obtains by three-phase full wave rectifier circuit 10, and this direct voltage VD is depressurized to the direct-current control voltage VS of regulation and supplies to electric-leakage detection circuit 7 from the control power supply terminal.

Below, the test circuit that carries out the leakage tests action is described.Leakage tests action is meant that three winding 6b through measuring current being flow through be arranged in the zero phase current transformer 6 carry out leakage tripping, and this measuring current is to utilize the direct-current control voltage VS that obtained by power circuit 9 step-downs to produce through the switch motion of measuring current drive circuit 13.The switch motion of measuring current drive circuit 13 is carried out through the output of AND circuit 14, input side of the positive electrode detector 15 and negative side detector 16 detection signal separately in this AND circuit 14.Measuring current drive circuit 13 carries out the action that making operation produces measuring current according to the operator to Test Switchboard 17.

Here; Side of the positive electrode detector 15 is configured on the side of the positive electrode conductor that can detect the conducting of following rectifier diode, and this rectifier diode is the R phase that constitutes the side of the positive electrode bridge arm of three-phase full wave rectifier circuit 10, rectifier diode D1, the D2 of this 2 phase of S phase.In addition; Negative side detector 16 is configured on the negative side conductor that can detect the conducting of the following rectifier diode in the negative side bridge arm of three-phase full wave rectifier circuit 10, and this rectifier diode is: with corresponding to the R of rectifier diode D1 and D2 mutually with S mutually this 2 in mutually a corresponding phase, be the rectifier diode D5 of S phase; And with except corresponding to rectifier diode D 1, D2 2 mutually corresponding phase, be the rectifier diode D6 of T phase.

Side of the positive electrode detector 15, negative side detector 16, AND circuit 14 and measuring current drive circuit 13, Test Switchboard 17 constitute the test circuit of the related RCCB 1 of the 1st execution mode of the present invention.

In addition; Side of the positive electrode detector 15 is configured on the side of the positive electrode conductor that can detect the conducting of the rectifier diode of any 2 phases in the side of the positive electrode bridge arm of three-phase full wave rectifier circuit 10 and gets final product; In addition; Negative side detector 16 is configured on the negative side conductor that can detect the conducting of following rectifier diode and gets final product, and this rectifier diode is: with 2 the rectifier diodes of phase of a corresponding negative side bridge arm in mutually of the side of the positive electrode bridge arm that is carried out conduction detection by side of the positive electrode detector 15; And with 2 rectifier diodes of phase of corresponding negative side bridge arm mutually except the side of the positive electrode bridge arm that carries out conduction detection by side of the positive electrode detector 15, above-mentioned configuration is not limited to configuration shown in Figure 1.

Test operation carries out through Test Switchboard 17 is connected, and only when Test Switchboard 17 is connected, flows into measuring current from measuring current drive circuit 13 to three winding 6b of zero phase current transformer 6.

For the related RCCB 1 of the 1st execution mode of the present invention that constitutes in the above described manner; Electric leakage takes place in the alternating current circuit of leaking electricity and make main circuit flow through leakage current if detect; Then the secondary winding 6a output from zero phase current transformer 6 detects electric current, and is input to electric-leakage detection circuit 7.Electric-leakage detection circuit 7 detects the generation of electric leakage based on the detection electric current of being imported, and will supply to tripgear 8 by the direct-current control voltage VS that power circuit 9 step-downs obtain and make its action.The tripgear 8 of action makes the switching mechanism tripping operation of switch portion 5, cuts off main circuit 4.

Below, the leakage tests action of RCCB 1 is described.Fig. 2 is when stream has three-phase alternating current in the main circuit 4 of RCCB 1 shown in Figure 1, the oscillogram of the electric current that flows through in the rectifier diode of three-phase full wave rectifier circuit 10, the waveform of the electric current of (a)～(f) representing respectively to flow through among rectifier diode D 1～D6.Fig. 3 is the oscillogram of the waveform of each several part in the test action under the expression normal power-up state shown in Figure 2; (a) expression is input to the electric current in the side of the positive electrode detector 15; (b) expression is input to the electric current in the negative side detector 16, (c) the output signal of expression side of the positive electrode detector 15, (d) the output signal of expression negative side detector 16; (e) the output signal of expression AND circuit 14, (f) expression is from the measuring current of measuring current drive circuit 13 outputs.

Shown in Fig. 3 (a), to the electrical current of side of the positive electrode detector 15 input rectifying diode D1, D2 and electric current, side of the positive electrode detector 15 pulse signal shown in the output map 3 (c), is promptly exported signal according to being set at more low level detection threshold.Regularly synchronously export with the conducting of rectifier diode D1, D2 from the output signal of this side of the positive electrode detector 15 outputs; Become electrical current and phase locked signal electric current with rectifier diode D1, D2, expression rectifier diode D1, D2 are in conducting state.

In addition, shown in Fig. 3 (b), to the electrical current of negative side detector 16 input rectifying diode D5, D6 and electric current, negative side detector 16 pulse signal shown in the output map 3 (d), is promptly exported signal according to being set at more low level detection threshold.Regularly synchronously export with the conducting of rectifier diode D5, D6 from the output signal of this negative side detector 16 outputs; Become electrical current and phase locked signal electric current with rectifier diode D5, D6, expression rectifier diode D5, D6 are in conducting state.

The output signal of side of the positive electrode detector 15 and the output signal indication of negative side detector 16 detect the conducting state of the diode of three-phase full wave rectifier circuit 10, are and the complete synchronous signal of the current phase of main circuit 4.Promptly; With the R phase current from negative under the situation of positive zero crossing (zero cross point) as 0 ° at phase angle; 60 °～300 ° outputs synchronously in the output signal of side of the positive electrode detector 15 and phase angle, 0 °～240 ° outputs synchronously in the output signal of negative side detector 16 and phase angle.

Output signal for the AND circuit 14 shown in Fig. 3 (e); It is output signal output when importing the output signal of output signal and negative side detector 16 of side of the positive electrode detector 15 at the same time; Therefore the phase angle of the output signal of this AND circuit 14 is 60 °～240 °, and promptly the deration of signal is 180 ° a square wave.Measuring current drive circuit 13 is based on the output signal of AND circuit 14; Make by power circuit 9 step-downs and from the direct-current control voltage VS break-make of control power supply terminal output and produce measuring current; Therefore shown in Fig. 3 (f), can access duty ratio and be about 50% measuring current.

Owing to making the direct-current control voltage VS break-make that is obtained by power circuit shown in Figure 19 step-downs, measuring current drive circuit 13 exports measuring current; Therefore can reduce the voltage that applies to three winding 6b of zero phase current transformer 6; In addition; Since the end of three winding 6b with the signal ground side, be that ground wire GND is connected, therefore can with three winding 6b with secondary winding 6a that electric-leakage detection circuit 7 is connected between the potential difference inhibition be Min., especially; All be wound at secondary winding 6a and three winding 6b on the iron core of zero phase current transformer 6 and carry out to simplify the insulation processing of secondary winding 6a and three winding 6b under the situation of embedding.

Test Switchboard 17 shown in Figure 1 constitutes the circuit that output signal to AND circuit 14 is input to before the measuring current drive circuit 13 and connects disconnection, connects disconnection but also can constitute to carrying out the circuit that power supply supplies with from power circuit 9 to measuring current drive circuit 13.No matter Test Switchboard 17 is any structure, and measuring current drive circuit 13 can become low voltage configuration with AND circuit 14, also can use cheap low pressure with switch as Test Switchboard 17.

Below, the leakage tests action of RCCB 1 is described.Fig. 4 illustrates and owes the oscillogram that the action under the situation of phase describes mutually at the R of three-phase alternating-current supply to structure shown in Figure 1; (a) expression is input to the electric current in the side of the positive electrode detector 15; (b) expression is input to the electric current in the negative side detector 16, (c) the output signal of expression side of the positive electrode detector 15, (d) the output signal of expression negative side detector 16; (e) the output signal of expression AND circuit 14, (f) expression is from the measuring current of measuring current drive circuit 13 outputs.

Owe mutually at R under the situation of phase; Supply with the single-phase voltage of the S-T phase that becomes main circuit 4 to the control power supply of RCCB 1; To the electric current of side of the positive electrode detector 15 input only is the electric current from the rectifier diode D2 of the S phase flow direction three-phase full wave rectifier circuit 10 of main circuit 4, thereby becomes the half-wave waveform shown in Fig. 4 (a).On the other hand; Electric current to 16 inputs of negative side detector becomes following electric current; This electric current is to flow to the electric current and the T electric current sum mutually that flows to main circuit 4 from rectifier diode D6 of the S phase of main circuit 4 from rectifier diode D5, thereby becomes the single-phase full wave rectified waveform shown in Fig. 4 (b).

Thereby, side of the positive electrode detector 15 and negative side detector 16 output signal separately become (c) of Fig. 4 and (d) shown in waveform.The output signal of AND circuit 14 is logical ANDs of the output of side of the positive electrode detector 15 and negative side detector 16, and therefore shown in Fig. 4 (e), it is identical with the output signal of side of the positive electrode detector 15 that its result becomes.Thereby the measuring current from the output signal based on AND circuit 14 carries out measuring current drive circuit 13 acquisitions of switch motion becomes duty ratio and is about 50% half-wave waveform shown in solid line among Fig. 4 (f).

In addition; The waveform of Fig. 4 (f) is represented the measuring current under the following situation; Promptly utilize measuring current drive circuit 13 to make the situation of only not carrying out level and smooth direct-current control voltage VS break-make by power circuit 9 step-downs; If but made direct-current control voltage VS fully level and smooth, then could make measuring current become duty ratio and be about 50% square wave.

Below, the S that main circuit 4 is described owes the action under the situation of phase mutually.Fig. 5 illustrates and owes the oscillogram that the action under the situation of phase describes mutually at the S of three phase mains to structure shown in Figure 1; (a) expression is input to the electric current in the side of the positive electrode detector 15; (b) expression is input to the electric current in the negative side detector 16, (c) the output signal of expression side of the positive electrode detector 15, (d) the output signal of expression negative side detector 16; (e) the output signal of expression AND circuit 14, (f) expression is from the measuring current of measuring current drive circuit 13 outputs.

Owing mutually at S under the situation of phase, supply with the single-phase voltage of the R-T phase that becomes main circuit 4 to the control power supply of RCCB 1, only is the electric current from R phase flow direction rectifier diode D1 to the electric current of side of the positive electrode detector 15 inputs, becomes the half-wave waveform shown in Fig. 5 (a).On the other hand, the electric current of importing to negative side detector 16 only is to flow to the electric current of T phase from rectifier diode D6, thereby becomes the half-wave waveform shown in Fig. 5 (b), and is identical with the electric current that is input to side of the positive electrode detector 15.Thereby; (c) of Fig. 5 and (d) shown in side of the positive electrode detector 15 and the output signal of negative side detector 16 and the output signal of the AND circuit 14 shown in Fig. 5 (e) become identical waveform; Thus from the measuring current of measuring current drive circuit 13 output shown in solid line Fig. 5 (f), become duty ratio and be about 50% half-wave waveform.

Below, the T that main circuit 4 is described owes the action under the situation of phase mutually.Fig. 6 illustrates and owes the oscillogram that the action under the situation of phase describes mutually at the T of three phase mains to structure shown in Figure 1; (a) expression is input to the electric current in the side of the positive electrode detector 15; (b) expression is input to the electric current in the negative side detector 16, (c) the output signal of expression side of the positive electrode detector 15, (d) the output signal of expression negative side detector 16; (e) the output signal of expression AND circuit 14, (f) expression is from the measuring current of measuring current drive circuit 13 outputs.

Owe mutually at T under the situation of phase; Supply with the single-phase voltage of the R-S phase that becomes main circuit 4 to the control power supply of RCCB 1; Electric current to 15 inputs of side of the positive electrode detector becomes following electric current; This electric current is from the electric current of R phase flow direction rectifier diode D 1 with from the electric current sum of S phase flow direction rectifier diode D2, thereby becomes the single-phase full wave rectified waveform shown in Fig. 6 (a).On the other hand, the electric current of importing to negative side detector 16 only is to flow to the electric current of S phase from rectifier diode D5, thereby becomes the half-wave waveform shown in Fig. 6 (b).Above-mentioned electric current is identical with electric current under the situation that the action of R being owed mutually phase time side of the positive electrode detector 15 and negative side detector 16 is turned; Owe mutually at T under the situation of phase;, shown in the solid line Fig. 6 (f), become duty ratio equally and be about 50% half-wave waveform from the measuring current of measuring current drive circuit 13 output.

As stated; According to the related RCCB of the 1st execution mode of the present invention; Not only in main circuit under the state of the full energising mutually of three phase mains; Even owe mutually also can carry out test action under the state of phase one, and the identical duty ratio of frequency that measuring current can access the power supply of being switched in frequency and the main circuit all the time is about 50% waveform.

The 2nd execution mode.

Fig. 7 is the circuit diagram of the related RCCB of expression the 2nd execution mode of the present invention.Among Fig. 7, side of the positive electrode detector 15 is made up of optical coupler 18, resistance 19 and Zener diode 20.Optical coupler 18 is on the basis that is connected in series with resistance 19; Be connected in parallel with Zener diode 20; And; This optical coupler 18 is inserted between the side of the positive electrode lead-out terminal of negative pole and three-phase full wave rectifier circuit 10 of rectifier diode D1, D2, and wherein, the R that above-mentioned rectifier diode D1, D2 constitute three-phase full wave rectifier circuit 10 mutually and S side of the positive electrode bridge arm mutually.In addition, negative side detector 16 is made up of optical coupler 21, resistance 22 and Zener diode 23.Optical coupler 21 is on the basis that is connected in series with resistance 22; Be connected in parallel with Zener diode 23; And; The negative side lead-out terminal that this optical coupler 21 is inserted in positive pole and the three-phase full wave rectifier circuit 10 of rectifier diode D5, D6 is between the ground wire between the GND, and wherein, the S that above-mentioned rectifier diode D5, D6 constitute three-phase full wave rectifier circuit 10 mutually and T negative side bridge arm mutually.

The outlet side transistor of optical coupler 18 is connected with the outlet side transistor series of optical coupler 21, via resistance 24 and Test Switchboard 17 and be connected between the base stage of direct-current control voltage VS and transistor 25.The emitter of transistor 25 is connected with ground wire GND via three winding 6b of zero phase current transformer 6; And; Collector electrode is connected with direct-current control voltage VS via resistance 26; In 25 conduction periods of transistor, flow through the measuring current of the prescribed level of setting by resistance 26 among three winding 6b, three winding 6b are carried out excitation.

Here, transistor 25, resistance 26 these circuit structures constitute measuring current drive circuit 13.In addition, side of the positive electrode detector 15, negative side detector 16, resistance 24 and measuring current drive circuit 13, Test Switchboard 17 constitute the test circuit of the related RCCB 1 of the 2nd execution mode.Other structures are identical with the RCCB 1 of the 1st execution mode shown in Figure 1.

For the related RCCB 1 of the 2nd execution mode of the present invention that constitutes in the above described manner; Electric leakage takes place in the alternating current circuit of leaking electricity and make main circuit flow through leakage current if detect; Then the secondary winding 6a output from zero phase current transformer 6 detects electric current, and is input to electric-leakage detection circuit 7.Electric-leakage detection circuit 7 detects the generation of electric leakage based on the detection electric current of being imported, and will supply to tripgear 8 by the direct-current control voltage VS that power circuit 9 step-downs obtain and make its action.The tripgear 8 of action makes the switching mechanism tripping operation of switch portion 5, cuts off main circuit 4.

Below, the leakage tests action of RCCB 1 is described.In each the rectifier diode D1～D6 that constitutes three-phase full wave rectifier circuit 10, flow through the current sinking that consumes by electric-leakage detection circuit 7 grades; When the R that is constituting three-phase full wave rectifier circuit 10 mutually with S flow through among the rectifier diode D1, D2 of side of the positive electrode bridge arm mutually this current sinking during; When being rectifier diode D1, D2 conducting; Flow through electric current among the input side LED of the optical coupler 18 of side of the positive electrode detector 15, its outlet side transistor turns.

On the other hand; Optical coupler 21 for negative side detector 16; The S that constitutes three-phase full wave rectifier circuit 10 mutually with T mutually during rectifier diode D5, the D6 conducting of negative side bridge arm, produce electric current among the input side LED of optical coupler 21, its outlet side transistor turns.Thereby the disconnection of the output transistor of each optical coupler 18,21, the output state of conducting show as the disconnection of the output signal of side of the positive electrode detector 15 and negative side detector 16, the output state of conducting.Here, resistance 19 and resistance 22 are used for suppressing the electric current that the input side LED of optical coupler 18,21 flows through, the allowable current of the input side LED of optical coupler 18,21 with respect to the enough big situation of the maximum consumption electric current of circuit under, also can omit.

In addition; Thereby the reverse bias of the input side LED of 20,23 pairs of optical couplers 18,21 of Zener diode suppresses to prevent punch through damage; Be used to make the current sinking of circuit to walk around resistance 19 and resistance 22 simultaneously; Can through in the scope of the driving that does not influence optical coupler 18,21 with Zener voltage set lowlyer, i.e. 2～3V, descend thereby suppress voltage, can prevent the loss of rectification circuit.

Optical coupler 18,21 outlet side transistor series separately connects, and this series circuit constitutes and obtains the transistorized output of each outlet side and AND circuit output.Thereby; If make Test Switchboard 17 become on-state; Then only when optical coupler 18,21 all is in conduction period; The transistor 25 of measuring current drive circuit 13 becomes conducting, can be used to from the direct-current control voltage VS of power circuit 9 via resistance 26, transistor 25 and make among three winding 6b of zero phase current transformer 6 and flow through measuring current.

A series of actions of the leakage tests of RCCB 1 is identical to action shown in Figure 6 with Fig. 3 illustrated in the 1st execution mode.

As stated, according to the related RCCB of the 2nd execution mode of the present invention, can in addition, owe the test circuit that phase time also can move mutually with less parts even only use small parts just can constitute one.In addition; Under the smaller situation of the measuring current that in three winding 6b, flows through; Through using the good optical coupler of conversion efficiency as optical coupler 18,21, can omit switch with transistor 25, utilize the output transistor of optical coupler 18,21 directly direct-current control voltage VS to be carried out break-make; In this case, can further reduce number of components.

The 3rd execution mode.

Fig. 8 is the circuit diagram of the related RCCB of expression the 3rd execution mode of the present invention.Among Fig. 8, the R that constitutes three-phase full wave rectifier circuit 10 mutually with S rectifier diode D1, the D2 negative pole separately of side of the positive electrode bridge arm mutually, be connected with the resistance 27 that is used for this cathode voltage is carried out step-down, simultaneously, be connected with the positive pole of adverse current prevention with diode 28.Adverse current stops the negative pole and the formation T negative pole connection of the rectifier diode D3 of side of the positive electrode bridge arm mutually with diode 28.

On the other hand; The S that constitutes full-wave rectifying circuit 10 mutually with T rectifier diode D5, the D6 positive pole separately of negative side bridge arm mutually; Be connected with the emitter of the 1st transistor 29 that is made up of NPN transistor, positive pole and the ground wire GND of the rectifier diode D4 of negative side bridge arm connect the base stage of the 1st transistor 29 mutually with constituting R simultaneously via resistance 30.In addition, in order between the base stage of the 1st transistor 29, emitter, not apply reverse bias, and in order to limit the base current of the 1st transistor 29, and between the anodal tie point of rectifier diode D5, D6 and ground wire GND, insert Zener diode 31.The collector electrode of the 1st transistor 29 is connected with the emitter of the 2nd transistor 32 that is made up of NPN transistor, and wherein, the base stage of the 2nd transistor 32 is connected with an end of resistance 27.

The 1st transistor 29, Zener diode 31, resistance 30 are equivalent to the negative side detector 16 in the 1st and the 2nd execution mode.In addition, resistance the 27, the 2nd transistor 32 is equivalent to the side of the positive electrode detector 15 in the 1st and the 2nd execution mode.In addition, the 2nd transistor 32 as after state, also work as the AND circuit.

The collector electrode of the 2nd transistor 32 is connected with the base stage of the 3rd transistor 34 that is made up of PNP transistor via resistance 33, and the collector current of the 3rd transistor 34 after electric current amplifies is input to the base stage of the transistor 25 that constitutes measuring current drive circuit 13 via resistance 35 and Test Switchboard 17.

Adverse current stops with diode 28, Zener diode 31,36, resistance the 27,30,33,35, the 1st transistor the 29, the 2nd transistor the 32, the 3rd transistor 34 and measuring current drive circuit 13, constitutes the test circuit of the related RCCB of the 3rd execution mode 1.In addition, other structures are identical with the RCCB of the 2nd execution mode of Fig. 7.

For the related RCCB 1 of the 3rd execution mode of the present invention that constitutes in the above described manner; In the alternating current circuit of electric leakage electric leakage takes place and make and flow through leakage current in the main circuit if detect; Then the secondary winding 6a output from zero phase current transformer 6 detects electric current, is input to electric-leakage detection circuit 7.Electric-leakage detection circuit 7 detects the generation of electric leakage based on the detection electric current of being imported, and will be supplied to tripgear 8 by the direct-current control voltage VS that power circuit 9 step-downs obtain and make its action.The tripgear 8 of action makes the switching mechanism tripping operation of switch portion 5, cuts off main circuit 4.

Below, the leakage tests action of RCCB 1 is described.Constitute the rectifier diode D1 of the side of the positive electrode bridge arm of three-phase full wave rectifier circuit 10, the cathode voltage of D2, become the base current of the 2nd transistor 32 by resistance 27 step-downs.Here; When the current potential of the negative pole of rectifier diode D1, D2 is higher than the current potential of ground wire GND; Be the anodal current potential state higher of any rectifier diode among rectifier diode D1, the D2 than the current potential of ground wire GND, during this period with rectifier diode D1, D2 any one be in conducting state during equate.Thereby, only rectifier diode D1 or rectifier diode D2 be in conducting state during introversive the 2nd transistor 32 supply with base currents.

On the other hand; Be positioned at the 1st transistor 29 of negative side, its emitter is connected with rectifier diode D5, D6, and base stage is connected with ground wire GND via resistance 30; Therefore when having electric current to flow through among rectifier diode D5 or the rectifier diode D6, flow through the collector current of the 1st transistor 29.

Here; Because the collector electrode of the 1st transistor 29 is connected with the emitter of the 2nd transistor 32; Therefore when the 2nd transistor 32 becomes conducting state; Be in the 1st transistor 29 for conducting state and supply with self-resistance 27 base current during; During this period rectifier diode D1 or rectifier diode D2 are in conducting state and rectifier diode D5 or rectifier diode D6 and are in during the conducting state, and the output of the AND circuit that constitutes with the illustrated outlet side transistor by optical coupler 18,21 in the output of AND circuit 14 illustrated in the 1st execution mode or the 2nd execution mode is identical.

The 3rd transistor 34 is used for the collector current of the 2nd transistor 32 is amplified; Simultaneously; Make waveform become complete impulse waveform; Through with the output of the 3rd transistor 34, be that its collector current is input to measuring current drive circuit 13, can access and the identical measuring current of the 1st and the 2nd execution mode.

According to the related RCCB of aforesaid the 3rd execution mode of the present invention; Can utilize universal transistor or resistance with the small-signal action; Even constitute and owe the test circuit that phase time also can move mutually one; Use under the situation of optical coupler identically in circuit footprint and the 2nd execution mode, can realize the action more stable when at high temperature using than optical coupler.

The 4th execution mode.

Fig. 9 is the circuit diagram of the RCCB in expression the 4th execution mode of the present invention; The test circuit of RCCB 1 constitutes, and the rectifier diode that is connected the ground wire side of any 2 phases obtains the alternating component of main circuit 4 from the rectifier diode that constitutes three-phase full wave rectifier circuit 10.

Among Fig. 9; In the rectifier diode that constitutes three-phase full wave rectifier circuit 10; As on the rectifier diode D6 of the T phase of any phase and the position that ground wire is connected, insert the Base-Emitter of transistor 29 and the body that is connected in series of resistance 30, with this body that is connected in series Zener diode 31 that is connected in parallel.In addition; Except that above-mentioned any one mutually other any phase, be on rectifier diode D4 and the position that ground wire is connected of R phase; Insert the Base-Emitter of transistor 37 and the body that is connected in series of resistance 38, with this body that is connected in series Zener diode 39 that is connected in parallel.

The structure and the action of transistor 29, resistance 30 and the Zener diode 31 that is connected with above-mentioned T commutating phase diode D6; With the structure of the 1st transistor 29, resistance 30 and the Zener diode 31 shown in above-mentioned the 3rd execution mode with move similar; But be with the difference of the situation of the 3rd execution mode; The body that is connected in series of the Base-Emitter of transistor 29 and resistance 30, and Zener diode 31 only be connected with T commutating phase diode D6; The rectifier diode D5 of S phase directly is connected with ground wire GND; The structure and the action of transistor 37, resistance 38 and the Zener diode 39 that is connected with R commutating phase diode D4 also only are connected mutually different, the structure of structure and action and transistor 29, resistance 30 and Zener diode 31 and move identical.

The collector electrode of transistor 37 is connected with the base stage of transistor 25 with diode 42 via resistance 40.Likewise; The collector electrode of transistor 29 is connected with the base stage of transistor 25 with diode 43 via resistance 41; The turn-on action interlock of transistor 25 and transistor 37 and transistor 29 and become conducting makes via resistance 26 among three winding 6b of zero phase current transformer 6 and flows through measuring current.

In addition, the collector electrode of transistor 37 also is connected with resistance 44 except with resistance 40 is connected, and the collector current of transistor 37 also flows through the PNP transistor 46 and capacitor 47 that base stage and resistance 45 are connected in series via resistance 44.The emitter of transistor 46 is connected with an end of capacitor 47 and the emitter of transistor 25, and is connected with direct-current control voltage VS via Test Switchboard 17, and in addition, the collector electrode of transistor 46 is connected with the tie point of 43 of resistance 41 and diodes.

Transistor 25,29,37,46, resistance 26,30,38,40,41,44,45, Zener diode 31,39, diode 42,43, capacitor 47 constitute the test circuit of the related RCCB of the 4th execution mode 1.Other structures are identical with the RCCB of the 1st to the 3rd execution mode.

In addition, among Fig. 9, transistor 29,37, resistance 30,38 and Zener diode 31,39 be configured in R mutually with T negative side bridge arm mutually on, but the configuration said elements can be any 2 phases of negative side bridge arm mutually, be not limited to configuration shown in Figure 9.

For the related RCCB 1 of the 4th execution mode of the present invention that constitutes in the above described manner; In the alternating current circuit of electric leakage electric leakage takes place and make and flow through leakage current in the main circuit if detect; Then the secondary winding 6a output from zero phase current transformer 6 detects electric current, and is input to electric-leakage detection circuit 7.Electric-leakage detection circuit 7 detects the generation of electric leakage based on the detection electric current of being imported, and will be supplied to tripgear 8 by the direct-current control voltage VS that power circuit 9 step-downs obtain and make its action.The tripgear 8 of action makes the switching mechanism tripping operation of switch portion 5, cuts off main circuit 4.

Below, the action of the leakage tests of the RCCB 1 in the 4th execution mode is described.Figure 10 is the oscillogram of the waveform of each several part in the test action under the expression normal power-up state; (a) electric current that flows through among the expression rectifier diode D4, the electric current that (b) flows through among the expression rectifier diode D6, (c) collector current of expression transistor 37; (d) collector current of expression transistor 29; (e) voltage of expression capacitor 47, the electric current that (f) flows through in the expression diode 42, the electric current that (g) flows through in the expression diode 43; (h) base current of expression transistor 25, (i) expression becomes the collector current of the transistor 25 of measuring current.

Figure 10 (a) illustrates the electric current that flows through among the rectifier diode D4, under the situation of input three-phase alternating-current supply, constitutes that to flow through the angle of flow in the rectifier diode of three-phase full wave rectifier circuit 10 respectively be 120 ° electric current.Likewise, Figure 10 (b) illustrates the electric current that flows through among the rectifier diode D6, and the electric current that flows through among the rectifier diode D4 shown in itself and Figure 10 (a) has 120 ° phase difference.

Figure 10 (c) illustrates the collector current of the transistor 37 that is connected with rectifier diode D4.The emitter of transistor 37 is connected with rectifier diode D4, and base stage is connected with ground wire GND via resistance 38, when therefore in rectifier diode D4, having electric current to flow through, flows through the collector current of transistor 37.Because transistor 37 carries out turn-on action by its magnification ratio with faint base current, so the collector current of transistor 37 becomes the impulse waveform synchronous with the conducting of rectifier diode D4 shown in Figure 10 (c).

Figure 10 (d) illustrates the collector current of the transistor 29 that is connected with rectifier diode D6.The emitter of transistor 29 is connected with rectifier diode D6, and base stage is connected with ground wire GND via resistance 30, when therefore in rectifier diode D6, having electric current to flow through, flows through the collector current of transistor 29.Because transistor 29 carries out turn-on action by its magnification ratio with faint base current, so the collector current of transistor 29 becomes the impulse waveform synchronous with the conducting of rectifier diode D6 shown in Figure 10 (d).

The collector current of transistor 29 becomes the base current of transistor 25 with diode 43 via resistance 41; The collector current of transistor 37 becomes the electric current of the base stage that flows through transistor 25 with diode 42 via resistance 40; Simultaneously; Flow through transistor 46 and the capacitor 47 that base stage and resistance 45 are connected in series via resistance 44, when making transistor 46 conductings, capacitor 47 is charged.

Capacitor 47 is in conducting state at transistor 46, is to charge in conduction period of rectifier diode D4 shown in Figure 10 (e), be in off-state at transistor 46, be not conducting of rectifier diode D4 during in discharge.This capacitor 47 discharge and recharge time constant by the resistance value of the electrostatic capacitance of capacitor 47 and resistance 44,45 and be set at the official hour constant; During capacitor 47 discharges; The electric charge of capacitor 47 becomes the base current of transistor 46 via resistance 45 and discharges; Therefore as long as the voltage of capacitor 47 is not less than the base-emitter voltage (about 0.6V) of the transistor 46 shown in the dotted line among Figure 10 (e), just can make transistor 46 keep conducting state.

Because the collector electrode of transistor 46 is connected with the tie point of 43 of resistance 41 and diodes; Therefore when transistor 46 is in conducting state; Diode 43 becomes reverse-bias state, and the collector current of transistor 29 can not flow through diode 43, but flows through the collector electrode of transistor 46.Therefore,,, move from the mode of the signal of transistor 29 with counteracting in then during certain, only in diode 42, flow through signal thus, do not have the signal flow mistake in the diode 43 if transistor 37 becomes conducting state like Figure 10 (f) with (g).

With respect to the base stage of transistor 25, diode 42,43 become diode logic or, so the base current of transistor 25 is shown in Figure 10 (h), become with diode 42 in the electric current that flows through identical.Thereby the measuring current that the switch motion through transistor 25 obtains becomes with the phase locked duty ratio of the conducting of rectifier diode D4 and is about 33% waveform shown in solid line among Figure 10 (i).

Below, the leakage tests action of RCCB 1 under the state of in three-phase alternating-current supply, owing phase is described.Figure 11 illustrates and owes the oscillogram that the action under the situation of phase describes mutually at the R of three-phase alternating-current supply to structure shown in Figure 9; (a) electric current that flows through among the expression rectifier diode D4, the electric current that (b) flows through among the expression rectifier diode D6, (c) collector current of expression transistor 37; (d) collector current of expression transistor 29; (e) voltage of expression capacitor 47, the electric current that (f) flows through in the expression diode 42, the electric current that (g) flows through in the expression diode 43; (h) base current of expression transistor 25, (i) expression becomes the collector current of the transistor 25 of measuring current.

Owe mutually at R under the situation of phase; Supply with the single-phase voltage of the S-T phase that becomes main circuit 4 to the control power supply of RCCB 1; Shown in Figure 11 (a), do not flow through electric current among the rectifier diode D4, shown in Figure 11 (b), flow through the electric current of half-wave waveform among the rectifier diode D6.Thereby the collector electrode of transistor 37 does not have electric current to flow through shown in Figure 11 (c), shown in Figure 11 (d), only flows through the collector current of transistor 29.

As stated; Do not flow through the collector current of transistor 37; Therefore the voltage of capacitor 47 can not rise shown in Figure 11 (e), because transistor 46 also keeps off-state, so the signal of diode 43 sides can not be cancelled; Like Figure 11 (f) with (g), the collector current of transistor 29 flows through the base stage of transistor 25 via diode 43.The base current of transistor 25 is shown in Figure 11 (h), and is identical with the electric current that flows through in the diode 43.Thereby the measuring current that the switch motion through transistor 25 obtains is shown in solid line among Figure 11 (i), and the duty ratio that becomes with the conducting phase place same phase of rectifier diode D6 is about 50% half-wave waveform.

In addition; The waveform of Figure 11 (i) representes to utilize transistor 25 to make the measuring current under the situation that is not only had level and smooth direct-current control voltage VS break-make by power circuit 9 step-downs; If make direct-current control voltage VS fully level and smooth, then can make measuring current become duty ratio and be about 50% square wave.

Below, the S that main circuit 4 is described owes the leakage tests action under the state of phase mutually.Figure 12 illustrates and owes the oscillogram that the action under the situation of phase describes mutually at the S of three phase mains to structure shown in Figure 9; (a) electric current that flows through among the expression rectifier diode D4, the electric current that (b) flows through among the expression rectifier diode D6, (c) collector current of expression transistor 37; (d) collector current of expression transistor 29; (e) voltage of expression capacitor 47, the electric current that (f) flows through in the expression diode 42, the electric current that (g) flows through in the expression diode 43; (h) base current of expression transistor 25, (i) expression becomes the collector current of the transistor 25 of measuring current.

Owe mutually at S under the situation of phase, supply with the single-phase voltage of the R-T phase that becomes main circuit 4, like Figure 12 (a) with (b), flow through the electric current of half-wave waveform respectively among rectifier diode D4, the D6 to the control power supply of RCCB 1.Thereby the collector current of transistor 37,29 is like Figure 12 (c) with (d), and the pulse that becomes opposite phase replaces the electric current present waveform.

Through making the collector current that flows through impulse waveform in the transistor 37; The voltage of capacitor 47 is also shown in Figure 12 (e) thus; Become the waveform that repeats to discharge and recharge, keep conducting state, like Figure 12 (f) with (g) through making transistor 46; The signal of diode 43 sides is cancelled, and only the signal of diode 42 sides is input to the base stage of transistor 25 shown in Figure 12 (h).Thereby the measuring current that the switch motion through transistor 25 obtains is shown in solid line among Figure 12 (i), and the duty ratio that becomes with the conducting phase place same phase of rectifier diode D4 is about 50% half-wave waveform.

Below, the T that main circuit 4 is described owes the leakage tests action under the state of phase mutually.Figure 13 illustrates and owes the oscillogram that the action under the situation of phase describes mutually at the T of three phase mains to structure shown in Figure 9; (a) electric current that flows through among the expression rectifier diode D4, the electric current that (b) flows through among the expression rectifier diode D6, (c) collector current of expression transistor 37; (d) collector current of expression transistor 29; (e) voltage of expression capacitor 47, the electric current that (f) flows through in the expression diode 42, the electric current that (g) flows through in the expression diode 43; (h) base current of expression transistor 25, (i) expression becomes the collector current of the transistor 25 of measuring current.

Owe mutually at T under the situation of phase; Supply with the single-phase voltage of the R-S phase that becomes main circuit 4 to the control power supply of RCCB 1; Like Figure 13 (a) with (b), flow through the electric current of half-wave waveform among the rectifier diode D4, and do not flow through the electric current of half-wave waveform among the rectifier diode D6.Thereby, like Figure 13 (c) with (d), only flow through the collector current of transistor 37, do not flow through the collector current of transistor 29.

Flow through collector current in the transistor 37; Therefore the voltage of capacitor 47 repeats to discharge and recharge shown in Figure 13 (e), and transistor 46 becomes conducting state, with the signal cancellation of diode 43 sides; And diode 43 sides, be originally not flow through collector current in the transistor 29; Therefore like Figure 13 (f) with (g), only the collector current of transistor 37 flows through the base stage of transistor 25 via diode 42 shown in Figure 13 (h).Thereby the measuring current that the switch motion through transistor 25 obtains is shown in the solid line among Figure 13 (i), and the duty ratio that becomes with the conducting phase place same phase of rectifier diode D4 is about 50% half-wave waveform.

As stated; According to the related RCCB of the 4th execution mode of the present invention; Because for the whole parts that constitute test circuit; Can suppress for being less than or equal to the low-voltage of direct-current control voltage VS, and can use the parts of small-signal, therefore can reduce the circuit occupation space.

In addition, in three-phase circuit, do not owe under the normal condition of phase, the duty ratio of measuring current is reduced to about 33%; Even but duty ratio becomes about 33%; To the also not influence basically of detection of electrical leakage of electric-leakage detection circuit 7, on the contrary, owing to reducing of duty ratio; Correspondingly can suppress the consumed energy of measuring current, thereby can reduce to constitute the capacity of the parts of power circuit 9 and test circuit.

The 5th execution mode.

Owe mutually under the situation of phase even in the 1st execution mode to the 4 execution modes, illustrated at one of three-phase alternating-current supply; Also can carry out the RCCB of leakage tests action; But 1 owe can to carry out under the state of phase the leakage tests action mutually function be not necessary; Along with the difference of situation, owe the method for phase accident as judgement, also can consider to carry out the test action of RCCB.

Figure 14 illustrates the RCCB in the 5th execution mode of the present invention, and the test circuit of RCCB 1 constitutes 1 phase only from three-phase alternating-current supply, stipulated, is the alternating component that T obtains main circuit 4 mutually.Among Figure 14; In the rectifier diode that constitutes three-phase full wave rectifier circuit 10; One of regulation is on rectifier diode D6 and the position that ground wire is connected of T phase mutually, and the Base-Emitter of insertion transistor 29 and the body that is connected in series of resistance 30 are with this body that is connected in series Zener diode 31 that is connected in parallel.

The structure and the action of above-mentioned transistor 29, resistance 30 and Zener diode 31 are with the structure of the 1st transistor 29 shown in the 4th execution mode, resistance 30, Zener diode 31 with move identical.Be with the difference of the 4th execution mode, the circuit that conducting state of rectifier diode D4 is not detected, only the conducting to rectifier diode D6 detects.

The collector electrode of transistor 29 is connected with the base stage of transistor 34 via resistance 33, and the turn-on action interlock of transistor 34 and transistor 29 and become conducting makes via resistance 26 among three winding 6b of zero phase current transformer 6 and flows through measuring current.Zener diode 31, resistance 26,30,33, transistor 29,34 constitute the test circuit of the related RCCB 1 of the 5th execution mode.Other structures are identical with the RCCB of the 1st to the 4th execution mode.

RCCB 1 for the 5th execution mode of the present invention that constitutes in the above described manner; In the alternating current circuit of electric leakage electric leakage takes place and make and flow through leakage current in the main circuit if detect; Then the secondary winding 6a output from zero phase current transformer 6 detects electric current, is input to electric-leakage detection circuit 7.Electric-leakage detection circuit 7 detects the generation of electric leakage based on the detection electric current of being imported, and will supply to tripgear 8 through the direct-current control voltage VS that power circuit 9 step-downs obtain and make its action.The tripgear 8 of action makes the switching mechanism tripping operation of switch portion 5, cuts off main circuit 4.

In the test circuit that constitutes in the above described manner, only in rectifier diode D6, flow through electric current during in transistor 29 become conducting, transistor 34 becomes conducting when transistor 29 conductings.Like this, transistor 34 synchronously carries out conducting, off action with conducting, the off action of transistor 29, makes the direct-current control voltage VS break-make from power circuit 9, to produce measuring current.Thereby the measuring current of in main circuit 4, supplying with under the state that three-phase alternating-current supply is arranged is identical with the waveform shown in above-mentioned Figure 10 (i), can access duty ratio and be about 33% measuring current.In addition, R mutually or S owe the measuring current under the state of phase mutually, can access identical with Figure 11 (i) respectively duty ratio and be 50% measuring current with Figure 12 (i).In addition, owe mutually at T can't produce measuring current certainly under the situation of phase.

In addition, in Figure 14, omit the part suitable with the measuring current drive circuit of the 3rd execution mode shown in Figure 8 13; Utilize transistor 34 directly to drive measuring current and constitute; This is that the collector current of transistor 29 can be set greatlyyer, can fully guarantee the base current of transistor 34 thus because compare with the situation of the 3rd execution mode; If can use the high transistor of admissible set electrode current and magnification ratio 29, then also can utilize transistor 29 directly to drive measuring current.

In addition; In Figure 14; Test Switchboard 17 is arranged on lead-out terminal from power circuit 9 to the power supply supply line of transistor 34; But in addition,, can certainly work as Test Switchboard be arranged on the position that test is connected with signal break off etc. three winding 6b of 6 from transistor 29 to zero phase current transformer.

Like this; RCCB according to the 5th execution mode shown in Figure 9; Test circuit is connected with specific one of test circuit and owes mutually can't carry out test action under the situation of phase in three phase mains; But can suppress to whole parts of test circuit for being less than or equal to direct-current control voltage VS; And can use the parts of small-signal, and therefore to compare with the alternate mode that obtains measuring current via the power consumption resistance that in test circuit, adopts usually at present from main circuit, circuit footprint reduces.In addition, for need also using the cheap universal switch of small-signal, low-voltage, therefore in miniaturization, can reduce cost more than or equal to the Test Switchboard of the dielectric voltage withstand of main circuit voltage.

In addition; The related RCCB of the 4th execution mode also can be applied to single-phase with in the RCCB; But in the case, owe under the situation of phase RCCB meeting loss of function itself mutually one; Therefore only from one obtain the related RCCB of basis the 5th execution mode of test signal mutually mode be reasonably, can expect to have very high effect.

The 6th execution mode.

Figure 15 is the circuit diagram of the RCCB in expression the 6th execution mode of the present invention.In Figure 15; 48 pairs of following control power supplys of smmothing capacitor carry out smoothing; And the auxiliary capacitor of using of double as; To carry out the initial driving of tripgear 8 more reliably, wherein, this control power supply is to supply with to electric-leakage detection circuit 7 via diode 49 from the direct-current control voltage VS from power circuit 9.In addition, the control power supply of measuring current drive circuit 13 is from the side of the positive electrode of diode 49, promptly controls the power supply terminal side and supply with.

Utilize above structure; Producing the required electric energy of measuring current is only supplied with by the direct-current control voltage VS of power circuit 9; The electric charge of smmothing capacitor 48 can electric current to be tested generation consume, therefore can realize the operating stably of electric-leakage detection circuit 7 and tripgear 8.In addition; Make under the situation that does not have the control of smoothing on/off, the measuring current waveform obtains main circuit voltage is carried out the such waveform of halfwave rectifier, and is relative therewith; Under the situation of the control on/off after making smoothing, the measuring current waveform is near square wave.As test function; No matter be that any waveform can; But make the residual morely frequency content that original main circuit voltage is arranged of method meeting that does not have the control of smoothing on/off; Therefore for the electric energy of test circuit, preferably as this 6th execution mode, utilize smoothing direct-current control voltage VS before to supply with.

In addition, in Figure 15, an end of NOT circuit 50 is connected with the outlet side of electric-leakage detection circuit 7, and the other end is connected with an end of delay circuit 51.The other end of delay circuit 51 is connected with an input of AND circuit 14.Delay circuit 51 only constitutes and makes the output delay official hour at rising edge.One-shot circuit 52 constitutes, even continue Test Switchboard 17 is carried out the conducting operation, also only produces output in the moment of operation, if temporarily Test Switchboard 17 is not changed to disconnection, does not perhaps pass through the sufficient intermittent time, then can not return to initial condition.

Side of the positive electrode detector 15, negative side detector 16, AND circuit 14, delay circuit 51, NOT circuit 50, measuring current drive circuit 13, one-shot circuit 52 and Test Switchboard 17 etc. constitute the test circuit of the RCCB 1 in the 6th execution mode.In addition, the related RCCB of other structures and the 1st execution mode is identical.

For the related RCCB 1 of the 6th execution mode of the present invention that constitutes in the above described manner; In the alternating current circuit of electric leakage electric leakage takes place and make and flow through leakage current in the main circuit if detect; Then the secondary winding 6a output from zero phase current transformer 6 detects electric current, is input to electric-leakage detection circuit 7.Electric-leakage detection circuit 7 detects the generation of electric leakage based on the detection electric current of being imported, and will supply to tripgear 8 through the direct-current control voltage VS that power circuit 9 step-downs obtain and make its action.The tripgear 8 of action makes the switching mechanism tripping operation of switch portion 5, cuts off main circuit 4.

Below, explain that electric-leakage detection circuit 7 detects measuring currents and utilizes its output to begin to drive the action of the test circuit behind the tripgear 8.The output of electric-leakage detection circuit 7 is sent to tripgear 8, simultaneously, sends to the input of AND circuit 14 via NOT circuit 50 and delay circuit 51.NOT circuit 50 carries out logic inversion merely, electric-leakage detection circuit 7 do not have output state, be under the normal state, NOT circuit 50 is output as high level, AND circuit 14 becomes state of activation.Otherwise; Because of test action or taken place the electric leakage accident by electric-leakage detection circuit 7 detect the electric leakage and be under the situation of output state, the output of NOT circuit 50 becomes low level, regardless of other input state; AND circuit 14 all becomes no-output; Therefore, even under this state, make testing button 17 become on-state, can not produce measuring current yet.

In addition; Delay circuit 51 is the circuit that only make the output delay stipulated time at rising edge; Only the output of NOT circuit 50 when low level becomes high level, electric-leakage detection circuit 7 is when output state reverts to normal state; Send signal to the input of AND circuit 14 after when making fixed response time again, so in the stipulated time after electric-leakage detection circuit 7 produces output, the function stop of test action.

Usually; Under the state that the mains side of RCCB 1 and load-side oppositely are connected (being commonly called the contrary state that connects of power source loads); Still proceed to control the supply of power supply after RCCB 1 action, even therefore the output of electric-leakage detection circuit 7 is circuit of pulse output, under the situation that Test Switchboard 7 continues to connect; Also might tripgear 8 and power circuit 9 be burnt through repeating detection of electrical leakage and tripping operation; But the RCCB related according to the 6th execution mode through delay circuit 51 is set, can make the recovery of test function postpone; Its result makes the intermittent time longer than the excitation time of tripgear 8, can prevent burning of tripgear 8 and power circuit 9.

Delay circuit 51 as stated; Be used to prevent burning of under power source loads is contrary Test Switchboard 7 continues to connect when connecting situation tripgear 8 and power circuit 9; If but will set time of delay longlyer; Then also might take place to cause to carry out the such fault of test action, be difficult to sometimes prevent reliably to burn owing to the repetition of temporary transient short time test operation.

Here, even because this Test Switchboard 7 carries out making operation constantly, one-shot circuit 52 also only produces output in the moment of carrying out making operation; If so temporarily Test Switchboard 7 is not broken off; Perhaps do not pass through the sufficient intermittent time, then can not return to initial condition, pass through one-shot circuit 52 through the signal that makes Test Switchboard 7; Test action only becomes just have been carried out behind the making operation this time Test Switchboard 7; Even, also can repeat, can prevent burning of tripgear 8 and power circuit 9 reliably with enough intervals Test Switchboard 7 being changed under the constant state of connection.

The RCCB related according to the 6th execution mode of the invention described above; Tripgear 8 and power circuit 9 burns under the situation that Test Switchboard 7 continues to connect in the time of can preventing power source loads against connection; Even Test Switchboard 7 is being changed under the constant state of connection, also can preventing burning of tripgear 8 and power circuit 9 reliably.

In addition; In the 1st to the 5th execution mode; Also can with the situation of the 6th execution mode likewise; Smmothing capacitor with the output smoothingization that makes power circuit, and with the above-mentioned smmothing capacitor diode that is connected in series so that the electric charge of above-mentioned smmothing capacitor can not be consumed as above-mentioned measuring current during above-mentioned test operation.

In addition; In the 1st to the 5th execution mode, also can with the situation of the 6th execution mode likewise, constitute based on the output of electric-leakage detection circuit and drive tripgear during in; Make test circuit produce the function stop of measuring current; And also can with the situation of the 6th execution mode likewise, after driving tripgear, the recovery delay stipulated time of the function that test circuit is stopped.

In addition, in the 1st to the 5th execution mode, also can with the situation of the 6th execution mode likewise, make test circuit have one-shot circuit, it makes and when test operation, only produces measuring current at the appointed time.

Claims (12)

1. RCCB is characterized in that having:

Main circuit, it is connected with alternating current circuit; Switch portion, it makes above-mentioned main circuit connect disconnection; Zero phase current transformer, it has secondary winding and three windings, and this secondary winding generates output current based on the leakage current that flows through in the above-mentioned main circuit, and these three windings make when being applied with measuring current and produce output current in the above-mentioned secondary winding; Test circuit, it supplies with above-mentioned measuring current to above-mentioned three windings when test operation; Electric-leakage detection circuit, it is based on the output current of the secondary winding of above-mentioned zero phase current transformer and generate the output signal; Tripgear, it is driven based on the output signal of above-mentioned electric-leakage detection circuit, makes above-mentioned switch portion tripping operation, thereby cuts off above-mentioned main circuit; Power circuit, it is to above-mentioned electric-leakage detection circuit and above-mentioned tripgear supply capability; And full-wave rectifying circuit, its a plurality of rectifier diodes by bridge joint constitute, and the alternating voltage that is applied on the above-mentioned main circuit is carried out full-wave rectification and output dc voltage,

Above-mentioned power circuit is accepted from the supply of the above-mentioned direct voltage of above-mentioned full-wave rectifying circuit output, and the direct-current control voltage of the regulation that is generated is supplied to above-mentioned electric-leakage detection circuit and above-mentioned tripgear,

Above-mentioned test circuit is through to the electrical current of at least one rectifier diode in the above-mentioned a plurality of rectifier diodes that constitute above-mentioned full-wave rectifying circuit or apply voltage and detect; And the phase locked electric current of the alternating current that flows through in generation phase place and the above-mentioned main circuit supplies to above-mentioned three windings with the electric current that is generated as above-mentioned measuring current.

2. RCCB according to claim 1 is characterized in that,

Above-mentioned main circuit is made up of the three-phase circuit that is applied in three-phase alternating voltage, and above-mentioned full-wave rectifying circuit is made up of three-phase full wave rectifier circuit,

Above-mentioned test circuit has: the side of the positive electrode detector; Its energising to following 2 rectifier diodes detects, and these 2 rectifier diodes are to constitute 2 rectifier diodes that are connected with any 2 respectively in a plurality of rectifier diodes of side of the positive electrode bridge arm of above-mentioned three-phase full wave rectifier circuit; The negative side detector; Its energising to following 2 rectifier diodes detects; These 2 rectifier diodes are to constitute in a plurality of rectifier diodes of negative side bridge arm of above-mentioned three-phase full wave rectifier circuit, respectively with except above-mentioned any 2 phases and above-mentioned any 2 a certain 2 rectifier diodes that are connected in mutually mutually; And the measuring current drive circuit, when itself and above-mentioned side of the positive electrode detector and above-mentioned negative side detector detect above-mentioned energising simultaneously and in addition synchronous the time, make above-mentioned direct-current control voltage break-make, generate above-mentioned measuring current thus.

3. RCCB according to claim 2 is characterized in that,

Above-mentioned side of the positive electrode detector and above-mentioned negative side detector are made up of optical coupler respectively; This optical coupler has the switch element that conducting state changes when above-mentioned rectifier diode is switched on; Above-mentioned measuring current drive circuit is based on drive signal; Make above-mentioned direct-current control voltage break-make, above-mentioned drive signal is via the be connected in series circuit input that forms of the switch element with above-mentioned each optical coupler.

4. RCCB according to claim 2 is characterized in that,

Above-mentioned negative side detector has the 1st transistor; Conducting when its at least a portion at the electrical current of following 2 rectifier diodes is supplied with as base current; These 2 rectifier diodes are to constitute 2 rectifier diodes that are connected with any 2 in a plurality of rectifier diodes of negative side bridge arm of above-mentioned three-phase full wave rectifier circuit

Above-mentioned side of the positive electrode detector has the 2nd transistor; Its conducting when being supplied to base current and above-mentioned the 1st transistor turns based on being applied to the voltage on following 2 rectifier diodes; These 2 rectifier diodes are to constitute in a plurality of rectifier diodes of side of the positive electrode bridge arm of above-mentioned three-phase full wave rectifier circuit; With except above-mentioned any 2 phases and above-mentioned any 2 a certain 2 rectifier diodes that are connected in mutually mutually

Above-mentioned measuring current drive circuit makes above-mentioned direct-current control voltage break-make based on the above-mentioned the 2nd transistorized conducting state, generates above-mentioned measuring current thus.

5. RCCB according to claim 1 is characterized in that,

Above-mentioned test circuit has: transistor; They are conducting when at least a portion of following 2 rectifier diodes electrical current is separately supplied with as base current respectively, and these 2 rectifier diodes are to constitute 2 rectifier diodes that are connected with any 2 in a plurality of rectifier diodes of negative side bridge arm of above-mentioned full-wave rectifying circuit; And measuring current drive circuit; It is based on above-mentioned each transistorized conducting state; Make above-mentioned direct-current control voltage break-make, generate above-mentioned measuring current thus, simultaneously; When the some rectifier diodes in above-mentioned 2 rectifier diodes were in conducting state, the signal to the conducting state of representing another rectifier diode suppressed at the appointed time.

6. RCCB according to claim 1 is characterized in that,

Above-mentioned test circuit has testing circuit, and its energising to certain 1 rectifier diode in a plurality of rectifier diodes of the negative side bridge arm that constitutes above-mentioned full-wave rectifying circuit detects and generates the output signal,

This test circuit makes the above-mentioned direct-current control voltage break-make that is produced by above-mentioned power circuit based on the output signal that is produced by above-mentioned testing circuit, generates above-mentioned measuring current thus.

7. RCCB according to claim 6 is characterized in that,

Above-mentioned testing circuit has transistor; The series connection of its base stage and emitter is inserted between the negative side lead-out terminal of rectifier diode and above-mentioned full-wave rectifying circuit of the some negative side bridge arms that constitute above-mentioned full-wave rectifying circuit; With at least a portion in the electrical current of above-mentioned rectifier diode as base current and by being driven, above-mentioned testing circuit with above-mentioned transistorized collector current as above-mentioned output signal.

8. according to any described RCCB in the claim 1 to 7, it is characterized in that,

Above-mentioned power circuit will be depressurized to assigned voltage by the direct voltage of above-mentioned full-wave rectifying circuit output and the direct voltage that obtains; Supply to above-mentioned electric-leakage detection circuit and above-mentioned tripgear as above-mentioned direct-current control voltage; Above-mentioned test circuit makes above-mentioned direct-current control voltage break-make, thereby generates above-mentioned measuring current.

9. according to any described RCCB in the claim 1 to 7, it is characterized in that having:

Smmothing capacitor, it makes the electric current smoothing of flowing through above-mentioned electric-leakage detection circuit and above-mentioned tripgear owing to the supply of above-mentioned direct-current control voltage; And diode, it stops, and the electric charge of above-mentioned smmothing capacitor is consumed as above-mentioned measuring current when above-mentioned test operation.

10. according to any described RCCB in the claim 1 to 7, it is characterized in that,

Based on the output of above-mentioned electric-leakage detection circuit and above-mentioned tripgear is driven during, stop the above-mentioned measuring current systematic function of above-mentioned test circuit.

11. RCCB according to claim 10 is characterized in that,

After driving above-mentioned tripgear, make the recovery delay stipulated time of the above-mentioned measuring current systematic function that is stopped of above-mentioned test circuit.

12. according to any described RCCB in the claim 1 to 7, it is characterized in that,

Above-mentioned test circuit has one-shot circuit, and it makes and when above-mentioned test operation, only generates above-mentioned measuring current at the appointed time.

Images