CN2909280Y

CN2909280Y - Safety property all-purpose tester

Info

Publication number: CN2909280Y
Application number: CN 200620083893
Authority: CN
Inventors: 李辉; 曹瑞基
Original assignee: 李辉; 曹瑞基
Current assignee: Qingdao Ainuo Instrument Co., Ltd.
Priority date: 2006-04-28
Filing date: 2006-04-28
Publication date: 2007-06-06
Anticipated expiration: 2016-04-28

Abstract

The utility model discloses a comprehensive testing device for safety performance including a connection post, sampling and feedback circuit, SCM and switching circuit, the switching circuit comprises many sets of AC contacts, the electromagnetic windings of the AC contacts are connected with the SCM through a solid relay, the movable touch spots are connected in series in corresponding test loop and all testing loops are connected with external loads through the connection post. This comprehensive testing device use the SCM to control the solid relay to effectively control the on and off of AC contact and accurately switch various testing performances; the circuit structure is simple, cost is low and this model is easy to be made. In addition, with the flexible adoption of the AC contact auxiliary touch spots, not only the output connection posts are reduced to 6, the connection operation is simplified and the testing time is shortened, but also the mutual effect between various tests are avoided which makes the operation of switch parts safer and more reliable.

Description

Safety integrated tester

Technical field

The utility model belongs to the test instrumentation technical field, specifically, relate to a kind of when safety integrated tester conversion testing item, the control circuit that its inside related circuit is switched.

Background technology

Present household electrical appliance safety check instrument test mode generally includes three kinds of modes: first kind of mode is to utilize the individual event test instrumentation to test by a plurality of stations; The second way is that a station utilizes a plurality of individual event test instrumentations to carry out combined test; The third mode is to utilize the integration test instrument that a station is carried out integration test.In above-mentioned three kinds of test modes, mode one needs a plurality of stations, repeatedly wiring, logging test results repeatedly, waste of manpower, material resources and time; Mode two wiring more complicated need the time of test longer; Mode three pairs of stations, primary connection, one-shots can be realized the follow-on test of a plurality of detection phases, but its internal conversion circuit more complicated, the equipment cost height, security and stability is poor.

Summary of the invention

Three kinds of test mode wiring complexity, test duration are long, wasting manpower and material resources's deficiency in order to overcome in the prior art for the utility model, a kind of novel safety integrated tester is provided, adopt brand-new change-over circuit, realized the follow-on test of tester with simple circuit configuration, and wiring is simple, easy operating to a plurality of detections.

For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:

A kind of safety integrated tester, comprise binding post, sampling feedback circuit, single-chip microcomputer and change-over circuit, include many group A.C. contactors in described change-over circuit, the break-make of the solenoid of described A.C. contactor is controlled by the control signal of single-chip microcomputer output; The armature contact of described A.C. contactor is connected in the corresponding test loop, and each test loop connects external loading by binding post.

As further qualification to technique scheme, between the solenoid of described A.C. contactor and single-chip microcomputer, be connected with solid-state relay, the output terminal of single-chip microcomputer connects the input end of solid-state relay, and the controlled switch of described solid-state relay is connected in the power circuit of ac contactor coil.

As the further qualification again to technique scheme, described A.C. contactor includes six, and binding post also has six, can finish dielectric strength, insulation resistance, ground connection, leakage current, power, six tests of low voltage starting.Wherein, the A.C. contactor that is used to carry out the dielectric strength test has two, be connected step-up transformer elementary with output AC voltage signal SPWM after filtering circuit is handled through the normally opened contact of one of them A.C. contactor through power amplification by the PWM pulse-width signal of single-chip microcomputer output, the secondary generation high pressure of described step-up transformer is connected on two binding posts through the normally opened contact of another A.C. contactor, and is connected in the motherboard circuit through voltage sampling circuit.

Adopt the another one A.C. contactor to carry out the test of insulation resistance, the SPWM signal output part connects voltage doubling rectifing circuit through the normally opened contact of described A.C. contactor, produce DC voltage and go out the required DC voltage of Insulation test, and then be connected on two binding posts by the auxiliary contact of often opening of described A.C. contactor through the sampling feedback circuit conditioning.

In like manner, finish the test of ground connection by an A.C. contactor again, the SPWM signal output part connects the elementary of rising current transformer through the normally opened contact of described A.C. contactor, the big electric current of its secondary generation connects the sampling feedback circuit, adjusts the required electric current of earth resistance and outputs on two binding posts; Between described two binding posts, be parallel with the normally closed auxiliary contact of described A.C. contactor.Two ends at described stake resistance also are connected with two other binding post, the voltage at stake resistance two ends is sampled, and then be connected in the motherboard circuit through the normally opened contact of described A.C. contactor.

Shared two A.C. contactors of the test of leakage current, power and low voltage starting, its normally opened contact is connected between binding post and the isolating transformer secondary output end; The elementary connection external ac power source of described isolating transformer, the secondary normally opened contact that passes through three contactors form three groups of different voltage output channels, connect the normally opened contact of described A.C. contactor through the controlled switch of a solid-state relay; The solenoid of the input end of described solid-state relay and three contactors all is electrically connected on single-chip microcomputer, and its break-make is controlled by the high-low level signal of single-chip microcomputer output.In addition, in the power circuit of described three contactor solenoids, all be in series with the normally closed contact of two other contactor in the power circuit of each contactor,, effectively prevented generation of false action by the interlocking design.

Compared with prior art, advantage of the present utility model and good effect are: the utility model utilizes the Single-chip Controlling solid-state relay, and then realization is to effective control of A.C. contactor break-make, finish accurate switching between every test function with this, circuit structure is simple, cost is low, easy realization.In addition, by to the applying in a flexible way of described A.C. contactor auxiliary contact, the decreased number that not only makes output wiring terminal is 6, and has effectively avoided influencing each other between each test item, makes the action of switching device safer, reliable.Safety integrated tester of the present utility model is integrated in one every test function, has shortened the switching time of change-over circuit, thereby has effectively reduced user's test duration, has improved work efficiency.

Description of drawings

Fig. 1 is the change-over circuit schematic diagram of safety integrated tester in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

The utility model determines that in conjunction with test condition (electric current and voltage undetermined), method of testing and the test product mode of connection binding post number is 6 A1～A6.Crucial executive component in the change-over circuit adopts can anti-big electric current, insulating property height, the good A.C. contactor of anti-electrical property are realized.The safety integrated tester test event is 6, is respectively dielectric strength, insulation resistance, stake resistance, leakage current, power and 6 tests of low voltage starting.The A.C. contactor of carrying out the test item switch motion has 6 KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3, is divided into into 4 groups, leakage current, power and low voltage starting three tests shared 1 group of KJ2, KJ3; Each uses one group all other tests.Wherein, A.C. contactor KJ01A, KJ01B carry out the switch control of dielectric strength test; Switch control when A.C. contactor KJ10 carries out megger test; A.C. contactor KJ11 then carries out the switch control of earthing test, and the physical circuit syndeton is referring to shown in Figure 1.

, and then affact on the corresponding ac contactor coil and realize by the different solid-state relays of Single-chip Controlling for the control of the switch of each A.C. contactor KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3.Wherein, the output terminal of single-chip microcomputer connects the input end of solid-state relay, the output terminal of described solid-state relay, be that controlled switch is connected between interchange live wire～220V-L and the corresponding ac contactor coil, the other end of described A.C. contactor KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3 coil connects zero line～220V-N, and this partial circuit is not shown in the accompanying drawings.

When carrying out the dielectric strength test, A.C. contactor KJ01A among Single-chip Controlling Fig. 1, KJ01B moves simultaneously, the PWM pulse-width signal of single-chip microcomputer output generates 50Hz～60Hz after power amplification and filtering ac voltage signal SPWM enters the elementary of step-up transformer T01 through normally opened contact KJ01B-1 and the KJ01B-2 of A.C. contactor KJ01B, and then by its secondary generation high pressure, the sampling feedback circuit conditioning of forming via transformer T01-1 and T01-2 goes out to test required voltage, normally opened contact KJ01A-1 through A.C. contactor KJ01A, KJ01A-2 outputs to A1 by high pressure magnet ring T4, on the A4 binding post, and disconnect A.C. contactor KJ01B and be connected on three normally closed auxiliary contact KJ01B-a/b/c of leakage signal line, and then avoid the circuit high pressure to damage.

When carrying out megger test, A.C. contactor KJ10 action among Fig. 1, its normally opened contact KJ10-1 and KJ10-2 closure, enter voltage doubling rectifing circuit through power amplification and filtered SPWM signal 135 ports by base plate, produce the sampling feedback circuit conditioning of DC voltage on mainboard and go out the required DC voltage of Insulation test, and then by A.C. contactor KJ10 often open auxiliary contact KJ10-3 and KJ10-4, output on A1, the A4 binding post through high pressure magnet ring T4.Described high pressure magnet ring T4 can play the effect of isolating effect when strengthening ac voltage measurement in circuit.

When carrying out earthing test, A.C. contactor KJ11 action among Fig. 1, enter rising current transformer T11 through power amplification and filtered SPWM signal by its normally opened contact KJ11-1 and KJ11-2, produce big electric current, connect motherboard circuit through transformer T11-1 sample rate current value through JDI, the GND of base plate end, and then feedback regulation goes out the required electric current of earth resistance, outputs on A5, the A6 binding post.Between described A5 and A6 binding post, be parallel with the normally closed auxiliary contact KJ11-a of A.C. contactor KJ11.When carrying out earth resistance, tested stake resistance also is connected between A3, the A4 binding post simultaneously, voltage to the stake resistance two ends is sampled, and then often open contact KJ11-3 and be connected base plate with KJ11-4, by its JDU, GND port the magnitude of voltage that collects is delivered in the motherboard circuit.

When carrying out leakage current (dynamically), power and low voltage starting test, A.C. contactor KJ2, KJ3 move simultaneously among Fig. 1, and Single-chip Controlling corresponding contact device KC3/KC6/KC0 action makes isolating transformer T3 output relevant voltage.For example, if measured power item, the control signal of single-chip microcomputer is by the J6 port output of base plate, normally closed contact KC0B and KC3B through contactor KC0 and KC3 are connected to contactor KJ6, control contactor KJ6 action, its normally closed contact KJ6A, KJ6B are disconnected, and then two other contactor KC0 and KC3 can't be moved.Thus, the mode of normally closed contact by two other contactor of series connection on the control line of each contactor KC3/KC6/KC0 realizes interlocking, thereby has effectively avoided two contactors to move damage to contactor and isolating transformer T3 simultaneously.At last, single-chip microcomputer is by the J5 port output low level of base plate, the controlled switch closure of control solid-state relay SSR, realize no mechanical contacting, and then the voltage signal of isolating transformer T3 output is connected on A1, the A2 binding post through normally opened contact KJ2-1 and the KJ3-1 of A.C. contactor KJ2, KJ3.The magnitude of voltage of isolating transformer T3 output is held by N, the L that normally closed auxiliary contact KJ01B-a and KJ01B-b are connected to base plate through normally opened contact KJ3-3, the KJ2-3 of parallel connection and KJ3-2, KJ2-2 in parallel, and the magnitude of voltage that collects is delivered in the motherboard circuit.Between binding post A1, A2, be connected with current transformer T2, electric current in power test and the startup test loop is sampled, and then FZI, GND by base plate end outputs in the motherboard circuit, and magnitude of voltage and the current value that collects multiplied each other, and can obtain performance number.When finishing test, Single-chip Controlling solid-state relay SSR is at first disconnected, thereby realizes switching on and off of no mechanical contact, when big electric current appears in circuit, has effectively played the effect of extinguishing arc, thereby prolongs the serviceable life of A.C. contactor.

When carrying out leakage current (static state) test, among Fig. 1, single-chip microcomputer is at first controlled A.C. contactor KJ2, KJ3 timesharing action, contactor KC3 action then, connect solid-state relay SSR at last, realize no mechanical contacting, connect load to be measured by binding post A1, A2.When finishing test, control solid-state relay SSR at first disconnects.

The utility model has been realized the conversion of safety integrated tester between multinomial test circuit by adopting above-mentioned simple circuit configuration, effectively avoided influencing each other between each test item, solved the problem of circuit mesohigh, big electric current, had that wiring is simple, an easy operating, significant advantage such as safe and reliable.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection domain of the present utility model.

Claims

1. safety integrated tester, comprise binding post, sampling feedback circuit, single-chip microcomputer and change-over circuit, it is characterized in that: include many group A.C. contactors (KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3) in described change-over circuit, the break-make of the solenoid of described A.C. contactor (KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3) is controlled by the control signal of single-chip microcomputer output; The armature contact of described A.C. contactor (KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3) is connected in the corresponding test loop, and (A1～A6) connects external loading to each test loop by binding post.

2. safety integrated tester according to claim 1, it is characterized in that: between described A.C. contactor (KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3) solenoid and single-chip microcomputer, be connected with solid-state relay, the output terminal of single-chip microcomputer connects the input end of solid-state relay, and the controlled switch of described solid-state relay is connected in the power circuit of A.C. contactor (KJ01A, KJ01B, KJ10, KJ11, KJ2, KJ3) coil.

3. safety integrated tester according to claim 1 and 2, it is characterized in that: in described change-over circuit, comprise two A.C. contactor (KJ01A that are used to carry out the dielectric strength test, KJ01B), PWM pulse-width signal output AC voltage signal SPWM after power amplification and filtering circuit processing by single-chip microcomputer output, normally opened contact (KJ01B-1 through one of them A.C. contactor (KJ01B), KJ01B-2) connect the elementary of step-up transformer (T01), the secondary generation high pressure of described step-up transformer (T01) is through the normally opened contact (KJ01A-1 of another A.C. contactor (KJ01A), KJ01A-2) be connected to two binding post (A1, A4) on, and be connected in the motherboard circuit through voltage sampling circuit.

4. safety integrated tester according to claim 3 is characterized in that: the normally closed auxiliary contact (KJ01B-a/b/c) of described A.C. contactor (KJ01B) is connected in the leakage current testing loop.

5. safety integrated tester according to claim 3, it is characterized in that: in described change-over circuit, comprise the A.C. contactor (KJ10) that is used to carry out megger test, the SPWM signal output part connects voltage doubling rectifing circuit through the normally opened contact (KJ10-1, KJ10-2) of described A.C. contactor (KJ10), produce DC voltage and go out the required DC voltage of Insulation test, and then be connected on two binding posts (A1, A4) by the auxiliary contact (KJ10-3, KJ10-4) of often opening of described A.C. contactor (KJ10) through the sampling feedback circuit conditioning.

6. safety integrated tester according to claim 5, it is characterized in that: in described change-over circuit, comprise the A.C. contactor (KJ11) that is used to carry out earthing test, the SPWM signal output part connects the elementary of rising current transformer through the normally opened contact (KJ11-1, KJ11-2) of described A.C. contactor (KJ11), the big electric current of its secondary generation connects the sampling feedback circuit, adjusts the required electric current of earth resistance and outputs on two binding posts (A5, A6); Between described two binding posts (A5, A6), be parallel with the normally closed auxiliary contact (KJ11-a) of described A.C. contactor (KJ11).

7. safety integrated tester according to claim 6, it is characterized in that: also be connected with two other binding post (A3, A4) at the two ends of described stake resistance, voltage to the stake resistance two ends is sampled, and then is connected in the motherboard circuit through the normally opened contact (KJ11-3, KJ11-4) of described A.C. contactor (KJ11).

8. safety integrated tester according to claim 6, it is characterized in that: comprise the A.C. contactor (KJ2, KJ3) that is used to carry out leakage current, power and low voltage starting test usefulness in described change-over circuit, its normally opened contact (KJ2-1, KJ3-1) is connected between binding post (A1, A2) and isolating transformer (T3) secondary output end; The elementary connection external ac power source of described isolating transformer (T3), the secondary normally opened contact that passes through three contactors (KC0, KC3, KC6) forms the normally opened contact (KJ2-1, KJ3-1) that three groups of different voltage output channels connect described A.C. contactor (KJ2, KJ3); The solenoid of described three contactors (KC0, KC3, KC6) is electrically connected on single-chip microcomputer, and its break-make is controlled by the high-low level signal of single-chip microcomputer output.

9. safety integrated tester according to claim 8 is characterized in that: in the power circuit of described three contactors (KC0, KC3, KC6) solenoid, all be in series with the normally closed contact of two other contactor in the circuit passband of each contactor.

10. safety integrated tester according to claim 9, it is characterized in that: be in series with the controlled switch of a solid-state relay (SSR) on the voltage output end of described isolating transformer (T3), the input end of described solid-state relay (SSR) connects the control signal output ends of single-chip microcomputer.