CN217882832U - Short-circuit protection circuit - Google Patents
Short-circuit protection circuit Download PDFInfo
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- CN217882832U CN217882832U CN202221290192.0U CN202221290192U CN217882832U CN 217882832 U CN217882832 U CN 217882832U CN 202221290192 U CN202221290192 U CN 202221290192U CN 217882832 U CN217882832 U CN 217882832U
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Abstract
The utility model discloses a short-circuit protection circuit, including the partial pressure unit, the sampling unit, the comparator unit, output filter unit, auto-lock unit and the control unit, the one end of partial pressure unit is used for inserting the high pressure output of group battery, the other end of partial pressure unit is connected with the first input electricity of comparator unit, the sample termination of sampling unit is used for gathering the voltage of flowing through the H bridge, the other end of sampling unit is connected with the second input electricity of comparator unit, the output of comparator unit is connected with the control unit electricity through output filter unit, and the output of comparator unit is connected with the input electricity of auto-lock unit, the output of auto-lock unit is connected with the second input electricity of comparator unit. The utility model relates to a short-circuit protection circuit, simple structure is sensitive to have self-locking function, make the circuit can last the protect state for a long time, thereby improve the reliability of circuit protection, and then guarantee the security of circuit, improve the stability of circuit work.
Description
Technical Field
The utility model relates to an inverter field especially relates to a short-circuit protection circuit.
Background
During the present group battery power supply, need increase the dc-to-ac converter and outwards supply power to output alternating current, and lack the short-circuit protection to the output among the current group battery inverter for inverter if the too big condition of voltage has appeared, then the short circuit appears easily in the during operation, and after the short circuit appears, can't in time protect again, thereby make inverter burn out easily, reduce circuit job stabilization nature and reliability. And the existing inverter is lack of a self-locking circuit, so that short-circuit protection cannot be continuously performed after short circuit, the time efficiency of circuit protection is reduced, and the circuit cannot perform short-circuit protection for a long time.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, providing a short-circuit protection circuit, simple structure is sensitive to have self-locking function, make the circuit can last the protected state for a long time, thereby improve the reliability of circuit protection, and then guarantee the security of circuit, improve the stability of circuit work.
The purpose of the utility model is realized through the following technical scheme:
a short-circuit protection circuit comprising: a voltage dividing unit, a sampling unit, a comparator unit, an output filter unit, a self-locking unit and a control unit,
the one end of partial pressure unit is used for inserting the high voltage output end of group battery, the other end of partial pressure unit with the first input electricity of comparator unit is connected, the sampling end of sampling unit is used for gathering the voltage of flowing through the H bridge, the other end of sampling unit with the second input electricity of comparator unit is connected, the output warp of comparator unit output filter unit with the control unit electricity is connected, and the output of comparator unit with the input electricity of auto-lock unit is connected, the output of auto-lock unit with the second input electricity of comparator unit is connected.
Preferably, the voltage dividing unit includes a resistor R14 and a resistor R15, a first end of the resistor R15 is electrically connected to the high-voltage output end of the battery pack, and a second end of the resistor R15 is electrically connected to the resistor R14 and the first input end of the comparator unit, respectively.
Preferably, the voltage dividing unit further includes a capacitor C8, and two ends of the capacitor C8 are electrically connected to two ends of the resistor R14, respectively.
Preferably, the sampling unit includes a resistor R13, a resistor R16, a resistor R18, and a capacitor C10, one end of the resistor R13 is grounded, the other end of the resistor R13 is electrically connected to the H-bridge, a first end of the resistor R18 is electrically connected to the resistor R13, a second end of the resistor R18 is electrically connected to the resistor R16 and the capacitor C10, respectively, and a second end of the resistor R18 is further electrically connected to the second input terminal of the comparator unit.
Preferably, the output filter unit includes a resistor R17 and a capacitor C11, a first end of the resistor R17 is electrically connected to the output end of the comparator unit, and a second end of the resistor R17 is electrically connected to the capacitor C11 and the control unit, respectively.
Preferably, the self-locking unit includes a capacitor C9 and a diode D1, a first end of the capacitor C9 is electrically connected to the output end of the comparator unit, a second end of the capacitor C9 is electrically connected to the second input end of the comparator unit, an anode of the diode D1 is electrically connected to the output end of the comparator unit, and a cathode of the diode D1 is electrically connected to the second input end of the comparator unit.
Preferably, the comparator unit is a comparator chip U1.
The utility model discloses compare in prior art's advantage and beneficial effect as follows:
the utility model relates to a short-circuit protection circuit, through setting up partial pressure unit, sampling unit, comparator unit and auto-lock unit, simple structure is sensitive to have self-locking function, make the circuit can last the protected state for a long time, thereby improve the reliability of circuit protection, and then guarantee the security of circuit, improve the stability of circuit work. The voltage division unit is used for providing the reference voltage of comparator unit, and the sampling unit is used for sampling the sampling voltage that the H bridge passed through, then when sampling voltage is greater than reference voltage, then carry out the short-circuit protection action, and the auto-lock unit can feed back the voltage of comparator unit output to the homophase input end of comparator unit, thereby can guarantee the continuous high pressure of output of comparator unit, can be in order to carry out the state of short-circuit protection continuously, thereby the reliability of protection circuit has been improved.
Drawings
Fig. 1 is a functional block diagram of a short-circuit protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of the short-circuit protection circuit shown in fig. 1.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are illustrated in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a short-circuit protection circuit includes: the voltage division unit, the sampling unit, the comparator unit, output filter unit, auto-lock unit and the control unit, it needs to explain, the voltage division unit is used for providing the reference voltage of comparator unit, the sampling unit is used for sampling H bridge through's sampling voltage, then when sampling voltage is greater than reference voltage, then carry out the short-circuit protection action, and the auto-lock unit can feed back the voltage of comparator unit output to the homophase input end of comparator unit, thereby can guarantee the output of comparator unit continuous high pressure, can be with the state that carries out short-circuit protection continuously, thereby protection circuit's reliability has been improved. In addition, the output filter unit is used for filtering the voltage at the output end of the comparator unit so as to enable the output voltage ripple to be more stable, and the control unit is used for receiving the voltage signal of the protection circuit and further controlling the output of the H bridge, namely controlling the output or the turn-off of the H bridge. In this embodiment, the comparator unit is a comparator chip U1.
Specifically, the one end of partial pressure unit is used for inserting the high voltage output end of group battery, the other end of partial pressure unit with the first input electricity of comparator unit is connected, the sampling end of sampling unit is used for gathering the voltage of flowing through the H bridge, the other end of sampling unit with the second input electricity of comparator unit is connected, the output warp of comparator unit output filter unit with the control unit electricity is connected, and the output of comparator unit with the input electricity of auto-lock unit is connected, the output of auto-lock unit with the second input electricity of comparator unit is connected. Specifically, the output terminal of the battery pack is the HV terminal of fig. 2.
So, through setting up partial pressure unit, sampling unit, comparator unit and auto-lock unit, simple structure is sensitive to have the auto-lock function, make the circuit can last the protected state for a long time, thereby improve the reliability of circuit protection, and then guarantee the security of circuit, improve the stability of circuit work.
Referring to fig. 2, the voltage dividing unit includes a resistor R14 and a resistor R15, a first end of the resistor R15 is electrically connected to the high voltage output end of the battery pack, and a second end of the resistor R15 is electrically connected to the resistor R14 and the first input end of the comparator unit, respectively. By providing the resistors R14 and R15 in this manner, a voltage division effect can be achieved.
Referring to fig. 2, the voltage dividing unit further includes a capacitor C8, and two ends of the capacitor C8 are electrically connected to two ends of the resistor R14, respectively. By arranging the capacitor C8, the filtering of the input voltage can be realized.
Referring to fig. 2, the sampling unit includes a resistor R13, a resistor R16, a resistor R18, and a capacitor C10, one end of the resistor R13 is grounded, the other end of the resistor R13 is electrically connected to the H-bridge, a first end of the resistor R18 is electrically connected to the resistor R13, a second end of the resistor R18 is electrically connected to the resistor R16 and the capacitor C10, respectively, and a second end of the resistor R18 is further electrically connected to a second input terminal of the comparator unit. In this way, the voltage sampling of the H-bridge can be realized by setting the resistor R13, and the voltage is divided by the resistor R16 and the resistor R18 and then subjected to RC filtering by the capacitor C10, so that the voltage sampling can be input into the comparator unit.
Referring to fig. 2, the output filter unit includes a resistor R17 and a capacitor C11, a first end of the resistor R17 is electrically connected to the output end of the comparator unit, and a second end of the resistor R17 is electrically connected to the capacitor C11 and the control unit, respectively. In this manner, the resistor R17 and the capacitor C11 are provided, whereby the RC filter function can be realized.
Referring to fig. 2, the self-locking unit includes a capacitor C9 and a diode D1, a first end of the capacitor C9 is electrically connected to an output end of the comparator unit, a second end of the capacitor C9 is electrically connected to a second input end of the comparator unit, an anode of the diode D1 is electrically connected to the output end of the comparator unit, and a cathode of the diode D1 is electrically connected to the second input end of the comparator unit. It should be noted here that the capacitor C9 is connected in the output end and the input end of the comparator unit, so that when the comparator outputs a high voltage, the capacitor is charged, and then the electrical connection is realized, that is, the voltage at the output end can have a certain delay and buffer and then be input into the non-inverting input end of the comparator, and the diode is used for sampling and unidirectional conduction, so that the voltage at the output end of the comparator unit can be sampled into the input end thereof, and a continuous high voltage effect is provided for the input end of the comparator unit, so that the comparator unit continuously outputs a high voltage, and the state of short-circuit protection is maintained.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A short-circuit protection circuit, comprising: a voltage dividing unit, a sampling unit, a comparator unit, an output filter unit, a self-locking unit and a control unit,
the one end of partial pressure unit is used for inserting the high voltage output end of group battery, the other end of partial pressure unit with the first input electricity of comparator unit is connected, the sampling end of sampling unit is used for gathering the voltage of flowing through the H bridge, the other end of sampling unit with the second input electricity of comparator unit is connected, the output warp of comparator unit output filter unit with the control unit electricity is connected, and the output of comparator unit with the input electricity of auto-lock unit is connected, the output of auto-lock unit with the second input electricity of comparator unit is connected.
2. The short-circuit protection circuit according to claim 1, wherein the voltage dividing unit comprises a resistor R14 and a resistor R15, a first end of the resistor R15 is electrically connected to the high-voltage output terminal of the battery pack, and a second end of the resistor R15 is electrically connected to the resistor R14 and the first input terminal of the comparator unit, respectively.
3. The short-circuit protection circuit according to claim 2, wherein the voltage dividing unit further comprises a capacitor C8, and two ends of the capacitor C8 are electrically connected to two ends of the resistor R14, respectively.
4. The short-circuit protection circuit of claim 1, wherein the sampling unit comprises a resistor R13, a resistor R16, a resistor R18, and a capacitor C10, one end of the resistor R13 is grounded, the other end of the resistor R13 is electrically connected to an H-bridge, a first end of the resistor R18 is electrically connected to the resistor R13, a second end of the resistor R18 is electrically connected to the resistor R16 and the capacitor C10, respectively, and a second end of the resistor R18 is further electrically connected to the second input terminal of the comparator unit.
5. The short-circuit protection circuit according to claim 1, wherein the output filter unit comprises a resistor R17 and a capacitor C11, a first end of the resistor R17 is electrically connected to the output end of the comparator unit, and a second end of the resistor R17 is electrically connected to the capacitor C11 and the control unit, respectively.
6. The short-circuit protection circuit according to claim 1, wherein the self-locking unit comprises a capacitor C9 and a diode D1, a first end of the capacitor C9 is electrically connected to the output terminal of the comparator unit, a second end of the capacitor C9 is electrically connected to the second input terminal of the comparator unit, an anode of the diode D1 is electrically connected to the output terminal of the comparator unit, and a cathode of the diode D1 is electrically connected to the second input terminal of the comparator unit.
7. The short-circuit protection circuit according to claim 1, wherein the comparator unit is a comparator chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221290192.0U CN217882832U (en) | 2022-05-26 | 2022-05-26 | Short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221290192.0U CN217882832U (en) | 2022-05-26 | 2022-05-26 | Short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217882832U true CN217882832U (en) | 2022-11-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221290192.0U Active CN217882832U (en) | 2022-05-26 | 2022-05-26 | Short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217882832U (en) |
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2022
- 2022-05-26 CN CN202221290192.0U patent/CN217882832U/en active Active
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