CN205319675U - Power load protection circuit - Google Patents
Power load protection circuit Download PDFInfo
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- CN205319675U CN205319675U CN201521013955.7U CN201521013955U CN205319675U CN 205319675 U CN205319675 U CN 205319675U CN 201521013955 U CN201521013955 U CN 201521013955U CN 205319675 U CN205319675 U CN 205319675U
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Abstract
The utility model discloses a power load protection circuit, including two at least channel circuit, short -circuit protection circuit, power supply circuit and be used for switching two at least channel circuit's channel switching circuit, the channel switching circuit be connected with at least two channel circuit, two at least channel circuit, short -circuit protection circuit, channel switching circuit all be connected with power supply circuit. This power load protection circuit can prevent power amplifier and test equipment's damage.
Description
Technical field
The utility model relates to a kind of holding circuit technical field, be specifically a kind of in the time detecting power source loads holding circuit for preventing that power amplifier is burned.
Background technology
In the time of detection power amplifier, the power supply of power amplifier is directly connected with civil power at present, then power amplifier is connected with oscillograph, audio analyzer again. And by the input access load of power amplifier, normally whether the relevant parameter that carrys out detection power amplifier at the output access oscillograph of power amplifier, audio analyzer and by some change-over switches. Because the power supply of power amplifier is to be directly connected with civil power, if short circuit appears in the inside of power amplifier while therefore detection, directly power amplifier can be burnt out, thereby cause damage. In addition, because the use of these change-over switches is frequent in the extreme, if therefore directly change-over switch access power amplifier is gone forward side by side to line operate, be easy to cause change-over switch to damage, thereby cause the interruption of testing, and then affect detection efficiency. Therefore, for these reasons, urgently need a kind of power source loads holding circuit, this power source loads holding circuit can prevent the damage of testing equipment, to address the above problem.
Utility model content
The technical problems to be solved in the utility model is, a kind of power source loads holding circuit is provided, and this power source loads holding circuit can prevent the damage of power amplifier and testing equipment.
The technical solution of the utility model is, a kind of power source loads holding circuit is provided, and comprises at least two channel circuits, short-circuit protection circuit, power circuit and for switching the channel switching circuit of at least two channel circuits; Described channel switching circuit is connected with at least two channel circuits; Described at least two channel circuits, short-circuit protection circuit, channel switching circuit are all connected with power circuit.
Described short-circuit protection circuit comprises a short circuit indicator lamp L1 and a switch S 1; The two ends of described switch S 1 are connected with the two ends of short circuit indicator lamp L1 respectively; One end of described short circuit indicator lamp L1 is connected with the live wire of civil power, and the other end of described short circuit indicator lamp L1 and the zero line of civil power are power output end.
Described short-circuit protection circuit also comprises voltage commutation circuit, and described voltage commutation circuit is arranged between one end and civil power of short circuit indicator lamp L1; Described voltage commutation circuit comprises transformer TF1, single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12; The primary side of described transformer TF1 is electrically connected with city; Two terminals of described transformer TF1 secondary side are connected with a tie point of single-pole double-throw switch (SPDT) SW11, a tie point of single-pole double-throw switch (SPDT) SW12 respectively; Another tie point of described single-pole double-throw switch (SPDT) SW11, another tie point of single-pole double-throw switch (SPDT) SW12 are electrically connected with city; The points of common connection of described single-pole double-throw switch (SPDT) SW11 is connected with one end of short circuit indicator lamp L1; The points of common connection of described single-pole double-throw switch (SPDT) SW12, the other end of short circuit indicator lamp L1 are power output end.
Described short-circuit protection circuit also comprises LED lamp indicating circuit, and described LED lamp indicating circuit is connected with one end of short circuit indicator lamp L1; Described LED lamp indicating circuit comprises LED1 lamp and the LED2 lamp of single-pole double-throw switch (SPDT) SW13, different colours; The points of common connection of described single-pole double-throw switch (SPDT) SW13 is connected with one end of short circuit indicator lamp L1; Described single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12, single-pole double-throw switch (SPDT) SW13 form a triac device, the anodic bonding of three Chang Kaiduan of described triac device and live wire, LED2 lamp, three normal-closed ends of described triac device and the secondary side of transformer TF1, the anodic bonding of LED1 lamp; The negative electrode of described LED1 lamp is connected with one end of resistance R 1, and the negative electrode of described LED2 lamp is connected with one end of resistance R 2; The other end of described resistance R 1, the other end of resistance R 2 are electrically connected with city.
Described channel circuit is two; Described channel switching circuit comprises switch S 2, diode D2, D3, relay J DQ5, JDQ6; One end of described switch S 2 is connected with positive source; The other end of described switch S 2 is connected with the negative electrode of diode D2, the negative electrode of diode D3, coil one end of relay J DQ5, coil one end of relay J DQ5; The coil other end of the anode of described diode D2, the anode of diode D3, relay J DQ5, the equal ground connection of the coil other end of relay J DQ5; Described relay J DQ5 and relay J DQ6 are equipped with two groups of contacts, and every group of contact includes a normally-closed contact, a normally opened contact and a common; Two normally-closed contacts, two normally opened contacts of described relay J DQ5 are connected with one of them channel circuit respectively with a common; Two normally-closed contacts, two normally opened contacts of described relay J DQ6 are connected with another one channel circuit respectively with a common; Another common of described relay J DQ5, another common of relay J DQ6 are all connected with common ground end.
A described wherein channel circuit comprises the insert module JK1, the JK2 that insert for plug, for the output module JK3 of signal output, switch S 3, single-pole double-throw switch (SPDT) SW2, diode D4, D5, relay J DQ1, JDQ2, resistance R 3, R4; Insert module JK1 is provided with first passage positive signal output CH1+ and first passage negative signal output CH1-; Insert module JK2 is provided with second channel positive signal output CH3+ and second channel negative signal output CH3-; Described first passage positive signal output CH1+, second channel negative signal output CH3+ are connected with a normally-closed contact, a normally opened contact of relay J DQ5 respectively; Described first passage negative signal output CH1-, second channel negative signal output CH3-are connected with another normally-closed contact, another normally opened contact of relay J DQ5 respectively; The input of described output module JK3 is connected with the common of relay J DQ5, a common of relay J DQ1; Coil one end of described relay J DQ1 is connected with a tie point of the negative electrode of diode D4, single-pole double-throw switch (SPDT) SW2, another normally opened contact of relay J DQ2; The anode of described diode D4 is connected with common ground end; A normally opened contact of described relay J DQ1 is connected with a common of relay J DQ2; A normally-closed contact of described relay J DQ2 is connected with one end of resistance R 3; The other end of described resistance R 3 is connected with a normally opened contact of relay J DQ2, one end of resistance R 4; The other end of described resistance R 4 is connected with common ground end; Coil one end of described relay J DQ2 is connected with the negative electrode of another tie point of single-pole double-throw switch (SPDT) SW2, diode D5, another common of relay J DQ2; The coil other end of described relay J DQ2, the anode of diode D5 are all connected with common ground end; The points of common connection of described single-pole double-throw switch (SPDT) SW2 is also connected with positive source.
A described other channel circuit also comprises short guarantor's switch S 3, and one end of described short guarantor's switch S 3 is connected with the input of output module JK3, and the other end of described short guarantor's switch S 3 is connected with common ground end.
A described wherein channel circuit comprises the insert module JK4, the JK5 that insert for plug, for the output module JK6 of signal output, switch S 4, single-pole double-throw switch (SPDT) SW3, diode D6, D7, relay J DQ3, JDQ4, resistance R 5, R6; Insert module JK3 is provided with first passage positive signal output CH2+ and first passage negative signal output CH2-; Insert module JK2 is provided with second channel positive signal output CH4+ and second channel negative signal output CH4-; Described first passage positive signal output CH2+, second channel negative signal output CH4+ are connected with a normally-closed contact, a normally opened contact of relay J DQ6 respectively; Described first passage negative signal output CH2-, second channel negative signal output CH4-are connected with another normally-closed contact, another normally opened contact of relay J DQ6 respectively; The input of described output module JK6 is connected with the common of relay J DQ6, a common of relay J DQ3; Coil one end of described relay J DQ3 is connected with a tie point of the negative electrode of diode D6, single-pole double-throw switch (SPDT) SW3, another normally opened contact of relay J DQ4; The anode of described diode D6 is connected with common ground end; A normally opened contact of described relay J DQ3 is connected with a common of relay J DQ4; A normally-closed contact of described relay J DQ4 is connected with one end of resistance R 5; The other end of described resistance R 5 is connected with a normally opened contact of relay J DQ4, one end of resistance R 6; The other end of described resistance R 6 is connected with common ground end; Coil one end of described relay J DQ4 is connected with the negative electrode of another tie point of single-pole double-throw switch (SPDT) SW3, diode D7, another common of relay J DQ4; The coil other end of described relay J DQ4, the anode of diode D7 are all connected with common ground end; The points of common connection of described single-pole double-throw switch (SPDT) SW3 is also connected with positive source.
A described wherein channel circuit also comprises short guarantor's switch S 4, and one end of described short guarantor's switch S 4 is connected with the input of output module JK6, and the other end of described short guarantor's switch S 4 is connected with common ground end.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
The two ends of the switch S 1 of the utility model power source loads holding circuit are connected with the two ends of short circuit indicator lamp L1 respectively; One end of short circuit indicator lamp L1 is connected with the live wire of civil power, and the other end of described short circuit indicator lamp L1 and the zero line of civil power are power output end. Connecting when power supply, first by switch S 1 in notconnect state, then connect power supply. If there is short-circuit state in detected power amplifier at this moment, load current can be added to short circuit indicator lamp L1 upper, make short circuit indicator lamp L1 light to remind tester's power-off and prevented that power amplifier is burned, thereby having avoided loss. The channel switching circuit of the utility model power source loads holding circuit is connected with two channel circuits; Described channel circuit, channel switching circuit are all connected with power circuit. Realize the large electric current of Small current control by the relay in channel switching circuit and two channel circuits, even if the use of these change-over switches is frequent in the extreme, also easily cause change-over switch to be damaged, thereby ensured normally carrying out of testing, and then ensured detection efficiency.
As improvement, described power source loads holding circuit also comprises voltage commutation circuit, and described voltage commutation circuit is arranged between one end and civil power of short circuit indicator lamp L1. Can adapt to different voltage by this voltage commutation circuit, thereby make the scope of application of the utility model power source loads holding circuit wider.
As improvement, described power source loads holding circuit also comprises LED lamp indicating circuit, and described LED lamp indicating circuit is connected with one end of short circuit indicator lamp L1. Can make operator be well understood to the voltage of this device work by LED lamp indicating circuit.
As improvement, a described wherein channel circuit also comprises short guarantor's switch S 3, and one end of described short guarantor's switch S 3 is connected with the input of output module JK3, and the other end of described short guarantor's switch S 3 is connected with common ground end. The signal that is arranged so that of short guarantor's switch S 3 can make electric current be led away very soon, thereby protects to a certain extent testing equipment not damaged by short circuit current.
As improvement, a described wherein channel circuit also comprises short guarantor's switch S 4, and one end of described short guarantor's switch S 4 is connected with the input of output module JK6, and the other end of described short guarantor's switch S 4 is connected with common ground end. The signal that is arranged so that of short guarantor's switch S 4 can make electric current be led away very soon, thereby protects to a certain extent testing equipment not damaged by short circuit current.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the utility model power source loads holding circuit.
Fig. 2 is the circuit theory diagrams of channel switching circuit.
Fig. 3 is the circuit theory diagrams of a channel circuit wherein.
Fig. 4 is the circuit theory diagrams of an other channel circuit.
Fig. 5 is the circuit theory diagrams of power circuit and short-circuit protection circuit.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, a kind of power source loads holding circuit of the utility model, comprises at least two channel circuits, short-circuit protection circuit, power circuit and for switching the channel switching circuit of at least two channel circuits; Described channel switching circuit is connected with at least two channel circuits; Described at least two channel circuits, short-circuit protection circuit, channel switching circuit are all connected with power circuit. Power circuit is made up of transformer TF2, diode D1 and electrochemical capacitor E1.
Described short-circuit protection circuit comprises a short circuit indicator lamp L1 and a switch S 1; The two ends of described switch S 1 are connected with the two ends of short circuit indicator lamp L1 respectively; One end of described short circuit indicator lamp L1 is connected with the live wire of civil power, and the other end of described short circuit indicator lamp L1 and the zero line of civil power are power output end.
Described short-circuit protection circuit also comprises voltage commutation circuit, and described voltage commutation circuit is arranged between one end and civil power of short circuit indicator lamp L1; Described voltage commutation circuit comprises transformer TF1, single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12; The primary side of described transformer TF1 is electrically connected with city; Two terminals of described transformer TF1 secondary side are connected with a tie point of single-pole double-throw switch (SPDT) SW11, a tie point of single-pole double-throw switch (SPDT) SW12 respectively; Another tie point of described single-pole double-throw switch (SPDT) SW11, another tie point of single-pole double-throw switch (SPDT) SW12 are electrically connected with city; The points of common connection of described single-pole double-throw switch (SPDT) SW11 is connected with one end of short circuit indicator lamp L1; The points of common connection of described single-pole double-throw switch (SPDT) SW12, the other end of short circuit indicator lamp L1 are power output end.
Described short-circuit protection circuit also comprises LED lamp indicating circuit, and described LED lamp indicating circuit is connected with one end of short circuit indicator lamp L1; Described LED lamp indicating circuit comprises LED1 lamp and the LED2 lamp of single-pole double-throw switch (SPDT) SW13, different colours; The points of common connection of described single-pole double-throw switch (SPDT) SW13 is connected with one end of short circuit indicator lamp L1; Described single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12, single-pole double-throw switch (SPDT) SW13 form a triac device, the anodic bonding of three Chang Kaiduan of described triac device and live wire, LED2 lamp, three normal-closed ends of described triac device and the secondary side of transformer TF1, the anodic bonding of LED1 lamp; The negative electrode of described LED1 lamp is connected with one end of resistance R 1, and the negative electrode of described LED2 lamp is connected with one end of resistance R 2; The other end of described resistance R 1, the other end of resistance R 2 are electrically connected with city.
In the present embodiment, channel circuit can be multiple, and the structure of channel circuit is all identical, a described wherein channel circuit comprises the insert module JK1, the JK2 that insert for plug, for the output module JK3 of signal output, switch S 3, single-pole double-throw switch (SPDT) SW2, diode D4, D5, relay J DQ1, JDQ2, resistance R 3, R4; Insert module JK1, JK2, be commercially available prod for the output module JK3 of signal output; Insert module JK1 is provided with first passage positive signal output CH1+ and first passage negative signal output CH1-; Insert module JK2 is provided with second channel positive signal output CH3+ and second channel negative signal output CH3-; Described first passage positive signal output CH1+, second channel negative signal output CH3+ are connected with a normally-closed contact, a normally opened contact of relay J DQ5 respectively; Described first passage negative signal output CH1-, second channel negative signal output CH3-are connected with another normally-closed contact, another normally opened contact of relay J DQ5 respectively; The input of described output module JK3 is connected with the common of relay J DQ5, a common of relay J DQ1; Coil one end of described relay J DQ1 is connected with a tie point of the negative electrode of diode D4, single-pole double-throw switch (SPDT) SW2, another normally opened contact of relay J DQ2; The anode of described diode D4 is connected with common ground end; A normally opened contact of described relay J DQ1 is connected with a common of relay J DQ2; A normally-closed contact of described relay J DQ2 is connected with one end of resistance R 3; The other end of described resistance R 3 is connected with a normally opened contact of relay J DQ2, one end of resistance R 4; The other end of described resistance R 4 is connected with common ground end; Coil one end of described relay J DQ2 is connected with the negative electrode of another tie point of single-pole double-throw switch (SPDT) SW2, diode D5, another common of relay J DQ2; The coil other end of described relay J DQ2, the anode of diode D5 are all connected with common ground end; The points of common connection of described single-pole double-throw switch (SPDT) SW2 is also connected with positive source. A described wherein channel circuit also comprises short guarantor's switch S 3, and one end of described short guarantor's switch S 3 is connected with the input of output module JK3, and the other end of described short guarantor's switch S 3 is connected with common ground end. Said structure is arranged and is multiple channel circuits to individual.
Described channel circuit is two; Described channel switching circuit comprises switch S 2, diode D2, D3, relay J DQ5, JDQ6; One end of described switch S 2 is connected with positive source; The other end of described switch S 2 is connected with the negative electrode of diode D2, the negative electrode of diode D3, coil one end of relay J DQ5, coil one end of relay J DQ5; The coil other end of the anode of described diode D2, the anode of diode D3, relay J DQ5, the equal ground connection of the coil other end of relay J DQ5; Described relay J DQ5 and relay J DQ6 are equipped with two groups of contacts, and every group of contact includes a normally-closed contact, a normally opened contact and a common; Two normally-closed contacts, two normally opened contacts of described relay J DQ5 are connected with one of them channel circuit respectively with a common; Two normally-closed contacts, two normally opened contacts of described relay J DQ6 are connected with another one channel circuit respectively with a common; Another common of described relay J DQ5, another common of relay J DQ6 are all connected with common ground end.
A described other channel circuit comprises the insert module JK4, the JK5 that insert for plug, for the output module JK6 of signal output, switch S 4, single-pole double-throw switch (SPDT) SW3, diode D6, D7, relay J DQ3, JDQ4, resistance R 5, R6; Insert module JK3 is provided with first passage positive signal output CH2+ and first passage negative signal output CH2-; Insert module JK2 is provided with second channel positive signal output CH4+ and second channel negative signal output CH4-; Described first passage positive signal output CH2+, second channel negative signal output CH4+ are connected with a normally-closed contact, a normally opened contact of relay J DQ6 respectively; Described first passage negative signal output CH2-, second channel negative signal output CH4-are connected with another normally-closed contact, another normally opened contact of relay J DQ6 respectively; The input of described output module JK6 is connected with the common of relay J DQ6, a common of relay J DQ3; Coil one end of described relay J DQ3 is connected with a tie point of the negative electrode of diode D6, single-pole double-throw switch (SPDT) SW3, another normally opened contact of relay J DQ4; The anode of described diode D6 is connected with common ground end; A normally opened contact of described relay J DQ3 is connected with a common of relay J DQ4; A normally-closed contact of described relay J DQ4 is connected with one end of resistance R 5; The other end of described resistance R 5 is connected with a normally opened contact of relay J DQ4, one end of resistance R 6; The other end of described resistance R 6 is connected with common ground end; Coil one end of described relay J DQ4 is connected with the negative electrode of another tie point of single-pole double-throw switch (SPDT) SW3, diode D7, another common of relay J DQ4; The coil other end of described relay J DQ4, the anode of diode D7 are all connected with common ground end; The points of common connection of described single-pole double-throw switch (SPDT) SW3 is also connected with positive source. Power circuit is output as 24V.
A described wherein channel circuit also comprises short guarantor's switch S 4, and one end of described short guarantor's switch S 4 is connected with the input of output module JK6, and the other end of described short guarantor's switch S 4 is connected with common ground end.
Below be only described with regard to most preferred embodiment of the present utility model, but can not be interpreted as it is limitations on claims. The utility model is not limited only to above embodiment, and its concrete structure allows to change. In every case the various variations of doing in the protection domain of the utility model independent claims are all in protection domain of the present utility model.
Claims (8)
1. a power source loads holding circuit, is characterized in that: comprise at least two channel circuits, short-circuit protection circuit, power circuit and for switching the channel switching circuit of at least two channel circuits; Described channel switching circuit is connected with at least two channel circuits; Described at least two channel circuits, short-circuit protection circuit, channel switching circuit are all connected with power circuit, and described short-circuit protection circuit comprises a short circuit indicator lamp L1 and a switch S 1; The two ends of described switch S 1 are connected with the two ends of short circuit indicator lamp L1 respectively; One end of described short circuit indicator lamp L1 is connected with the live wire of civil power, and the other end of described short circuit indicator lamp L1 and the zero line of civil power are power output end.
2. power source loads holding circuit according to claim 1, is characterized in that: described short-circuit protection circuit also comprises voltage commutation circuit, and described voltage commutation circuit is arranged between one end and civil power of short circuit indicator lamp L1; Described voltage commutation circuit comprises transformer TF1, single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12; The primary side of described transformer TF1 is electrically connected with city; Two terminals of described transformer TF1 secondary side are connected with a tie point of single-pole double-throw switch (SPDT) SW11, a tie point of single-pole double-throw switch (SPDT) SW12 respectively; Another tie point of described single-pole double-throw switch (SPDT) SW11, another tie point of single-pole double-throw switch (SPDT) SW12 are electrically connected with city; The points of common connection of described single-pole double-throw switch (SPDT) SW11 is connected with one end of short circuit indicator lamp L1; The points of common connection of described single-pole double-throw switch (SPDT) SW12, the other end of short circuit indicator lamp L1 are power output end.
3. power source loads holding circuit according to claim 2, is characterized in that: described short-circuit protection circuit also comprises LED lamp indicating circuit, and described LED lamp indicating circuit is connected with one end of short circuit indicator lamp L1; Described LED lamp indicating circuit comprises LED1 lamp and the LED2 lamp of single-pole double-throw switch (SPDT) SW13, different colours; The points of common connection of described single-pole double-throw switch (SPDT) SW13 is connected with one end of short circuit indicator lamp L1; Described single-pole double-throw switch (SPDT) SW11 and single-pole double-throw switch (SPDT) SW12, single-pole double-throw switch (SPDT) SW13 form a triac device, the anodic bonding of three Chang Kaiduan of described triac device and live wire, LED2 lamp, three normal-closed ends of described triac device and the secondary side of transformer TF1, the anodic bonding of LED1 lamp; The negative electrode of described LED1 lamp is connected with one end of resistance R 1, and the negative electrode of described LED2 lamp is connected with one end of resistance R 2; The other end of described resistance R 1, the other end of resistance R 2 are electrically connected with city.
4. power source loads holding circuit according to claim 1, is characterized in that: described channel circuit is two; Described channel switching circuit comprises switch S 2, diode D2, D3, relay J DQ5, JDQ6; One end of described switch S 2 is connected with positive source; The other end of described switch S 2 is connected with the negative electrode of diode D2, the negative electrode of diode D3, coil one end of relay J DQ5, coil one end of relay J DQ5; The coil other end of the anode of described diode D2, the anode of diode D3, relay J DQ5, the equal ground connection of the coil other end of relay J DQ5; Described relay J DQ5 and relay J DQ6 are equipped with two groups of contacts, and every group of contact includes a normally-closed contact, a normally opened contact and a common; Two normally-closed contacts, two normally opened contacts of described relay J DQ5 are connected with one of them channel circuit respectively with a common; Two normally-closed contacts, two normally opened contacts of described relay J DQ6 are connected with another one channel circuit respectively with a common; Another common of described relay J DQ5, another common of relay J DQ6 are all connected with common ground end.
5. power source loads holding circuit according to claim 4, it is characterized in that: a described wherein channel circuit comprises the insert module JK1, the JK2 that insert for plug, for the output module JK3 of signal output, switch S 3, single-pole double-throw switch (SPDT) SW2, diode D4, D5, relay J DQ1, JDQ2, resistance R 3, R4; Insert module JK1 is provided with first passage positive signal output CH1+ and first passage negative signal output CH1-; Insert module JK2 is provided with second channel positive signal output CH3+ and second channel negative signal output CH3-; Described first passage positive signal output CH1+, second channel negative signal output CH3+ are connected with a normally-closed contact, a normally opened contact of relay J DQ5 respectively; Described first passage negative signal output CH1-, second channel negative signal output CH3-are connected with another normally-closed contact, another normally opened contact of relay J DQ5 respectively; The input of described output module JK3 is connected with the common of relay J DQ5, a common of relay J DQ1; Coil one end of described relay J DQ1 is connected with a tie point of the negative electrode of diode D4, single-pole double-throw switch (SPDT) SW2, another normally opened contact of relay J DQ2; The anode of described diode D4 is connected with common ground end; A normally opened contact of described relay J DQ1 is connected with a common of relay J DQ2; A normally-closed contact of described relay J DQ2 is connected with one end of resistance R 3; The other end of described resistance R 3 is connected with a normally opened contact of relay J DQ2, one end of resistance R 4; The other end of described resistance R 4 is connected with common ground end; Coil one end of described relay J DQ2 is connected with the negative electrode of another tie point of single-pole double-throw switch (SPDT) SW2, diode D5, another common of relay J DQ2; The coil other end of described relay J DQ2, the anode of diode D5 are all connected with common ground end; The points of common connection of described single-pole double-throw switch (SPDT) SW2 is also connected with positive source.
6. power source loads holding circuit according to claim 5; it is characterized in that: a described other channel circuit also comprises short guarantor's switch S 3; one end of described short guarantor's switch S 3 is connected with the input of output module JK3, and the other end of described short guarantor's switch S 3 is connected with common ground end.
7. power source loads holding circuit according to claim 6, it is characterized in that: a described wherein channel circuit comprises the insert module JK4, the JK5 that insert for plug, for the output module JK6 of signal output, switch S 4, single-pole double-throw switch (SPDT) SW3, diode D6, D7, relay J DQ3, JDQ4, resistance R 5, R6; Insert module JK3 is provided with first passage positive signal output CH2+ and first passage negative signal output CH2-; Insert module JK2 is provided with second channel positive signal output CH4+ and second channel negative signal output CH4-; Described first passage positive signal output CH2+, second channel negative signal output CH4+ are connected with a normally-closed contact, a normally opened contact of relay J DQ6 respectively; Described first passage negative signal output CH2-, second channel negative signal output CH4-are connected with another normally-closed contact, another normally opened contact of relay J DQ6 respectively; The input of described output module JK6 is connected with the common of relay J DQ6, a common of relay J DQ3; Coil one end of described relay J DQ3 is connected with a tie point of the negative electrode of diode D6, single-pole double-throw switch (SPDT) SW3, another normally opened contact of relay J DQ4; The anode of described diode D6 is connected with common ground end; A normally opened contact of described relay J DQ3 is connected with a common of relay J DQ4; A normally-closed contact of described relay J DQ4 is connected with one end of resistance R 5; The other end of described resistance R 5 is connected with a normally opened contact of relay J DQ4, one end of resistance R 6; The other end of described resistance R 6 is connected with common ground end; Coil one end of described relay J DQ4 is connected with the negative electrode of another tie point of single-pole double-throw switch (SPDT) SW3, diode D7, another common of relay J DQ4; The coil other end of described relay J DQ4, the anode of diode D7 are all connected with common ground end; The points of common connection of described single-pole double-throw switch (SPDT) SW3 is also connected with positive source.
8. power source loads holding circuit according to claim 7; it is characterized in that: a described wherein channel circuit also comprises short guarantor's switch S 4; one end of described short guarantor's switch S 4 is connected with the input of output module JK6, and the other end of described short guarantor's switch S 4 is connected with common ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521013955.7U CN205319675U (en) | 2015-12-09 | 2015-12-09 | Power load protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521013955.7U CN205319675U (en) | 2015-12-09 | 2015-12-09 | Power load protection circuit |
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| CN205319675U true CN205319675U (en) | 2016-06-15 |
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| CN201521013955.7U Expired - Fee Related CN205319675U (en) | 2015-12-09 | 2015-12-09 | Power load protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406440A (en) * | 2015-12-09 | 2016-03-16 | 宁波中荣声学科技有限公司 | Power supply load protection circuit |
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2015
- 2015-12-09 CN CN201521013955.7U patent/CN205319675U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406440A (en) * | 2015-12-09 | 2016-03-16 | 宁波中荣声学科技有限公司 | Power supply load protection circuit |
| CN105406440B (en) * | 2015-12-09 | 2017-12-01 | 宁波中荣声学科技有限公司 | Power source loads protection circuit |
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