CN203734284U - High-low voltage protective circuit - Google Patents
High-low voltage protective circuit Download PDFInfo
- Publication number
- CN203734284U CN203734284U CN201420147875.XU CN201420147875U CN203734284U CN 203734284 U CN203734284 U CN 203734284U CN 201420147875 U CN201420147875 U CN 201420147875U CN 203734284 U CN203734284 U CN 203734284U
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- triode
- capacitor
- resistance
- voltage
- resistor
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Abstract
The utility model discloses a high-low voltage protective circuit. The high-low voltage protective circuit is characterized in that one end of a resistor R1 is connected with one end of a resistor R2 and one end of a capacitor C1, and the other end of the capacitor C1 is connected with a public grounding terminal; the other end of the resistor R1 is connected with the cathode of a voltage stabilizing diode ZD1, and the other end of the resistor R2 is connected with the cathode of a voltage stabilizing diode ZD2; the anode of the voltage stabilizing diode ZD1 is connected with the c pole of a triode Q1, one end of a capacitor C2, one end of a resistor R3 and the b pole of a triode Q2; the anode of the voltage stabilizing diode ZD2 is connected with the b pole of the triode Q1; the e pole of the triode Q1, the other end of the capacitor C2, the other end of the resistor R3 and the e pole of the triode Q2 are all connected with the public grounding terminal; the c pole of the triode Q2 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with one end of a resistor R5 and one end of a capacitor C, and the other end of the resistor R5 and the other end of the capacitor C are all connected with the public grounding terminal. According to the high-low voltage protective circuit, when input voltage is higher than or lower than rated voltage of an electronic product, the circuit has a protective effect on the electronic product.
Description
Technical field
The utility model relates to a kind of voltage protection circuit, is specifically a kind of high-low pressure protective circuit.
Background technology
Current electronic product has its operating voltage, this operating voltage be exactly product under its operating voltage, machine can normal work, if lower than this voltage range or higher than this voltage range, to machine, all can affect at work, even machine can be burnt out.In order to protect electronic product not to be damaged, generally can protect by a voltage protection circuit.The voltage protection circuit of prior art is generally low-voltage protection circuit, only has when the input voltage of electronic product is during lower than the rated voltage of electronic product, and this low-voltage protection circuit just can work to carry out the protection to product.And when input voltage is during higher than the rated voltage of electronic product, this low-voltage protection circuit can not be worked, thereby electronic product is caused to damage.Therefore, for these reasons, urgently need a kind of high-low pressure protective circuit, this circuit can all can play electronic product is played a protective role during higher or lower than the rated voltage of electronic product at input voltage.
Utility model content
The technical problems to be solved in the utility model is, a kind of high-low pressure protective circuit is provided, and this circuit can all can play electronic product is played a protective role during higher or lower than the rated voltage of electronic product at input voltage.
The technical solution of the utility model is, a kind of high-low pressure protective circuit is provided, and comprises resistance R 1, R2, R3, R4, R5, voltage stabilizing didoe ZD1, ZD2, capacitor C 1, C2, C3, triode Q1, Q2; One end of described resistance R 1 is connected with one end of resistance R 2, one end of capacitor C 1; The other end of described capacitor C 1 is connected with common ground end; The other end of described resistance R 1 is connected with the negative electrode of voltage stabilizing didoe ZD1; The other end of described resistance R 2 is connected with the negative electrode of voltage stabilizing didoe ZD2; The anode of described voltage stabilizing didoe ZD1 with the c utmost point of triode Q1, one end of one end of capacitor C 2, resistance R 3, the b utmost point of triode Q2 be connected; The anode of described voltage stabilizing didoe ZD2 is connected with the b utmost point of triode Q1; The e utmost point of described triode Q1, the other end of capacitor C 2, the other end of resistance R 3, the e of triode Q2 are extremely all connected with common ground end; The c utmost point of described triode Q2 is connected with one end of resistance R 4; One end of the other end of described resistance R 4 and the other end of resistance R 4 and one end of resistance R 5, capacitor C 3 is connected; The other end of the other end of described resistance R 5, capacitor C 3 is all connected with common ground end.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
The utility model high-low pressure protective circuit mainly plays limiting high pressure and low pressure by the cut-off conducting of two triodes; therefore at the input voltage of electronic product during below or above the rated voltage of electronic product; all can starting protection, so that electronic product is normally used.In addition, what the utility model high-low pressure protective circuit was used is all some commonplace components, therefore makes the use cost of the utility model high-low pressure protective circuit lower.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model high-low pressure protective circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of high-low pressure protective circuit of the utility model, comprises resistance R 1, R2, R3, R4, R5, voltage stabilizing didoe ZD1, ZD2, capacitor C 1, C2, C3, triode Q1, Q2; One end of described resistance R 1 is connected with one end of resistance R 2, one end of capacitor C 1, and one end of resistance R 1 is voltage detecting end, i.e. BATT end; LOW_DET end is connected with the MCU of electronic product, for low and high level variable signal is provided to MCU.The other end of described capacitor C 1 is connected with common ground end; The other end of described resistance R 1 is connected with the negative electrode of voltage stabilizing didoe ZD1; The other end of described resistance R 2 is connected with the negative electrode of voltage stabilizing didoe ZD2; The anode of described voltage stabilizing didoe ZD1 with the c utmost point of triode Q1, one end of one end of capacitor C 2, resistance R 3, the b utmost point of triode Q2 be connected; The anode of described voltage stabilizing didoe ZD2 is connected with the b utmost point of triode Q1; The e utmost point of described triode Q1, the other end of capacitor C 2, the other end of resistance R 3, the e of triode Q2 are extremely all connected with common ground end; The c utmost point of described triode Q2 is connected with one end of resistance R 4; One end of the other end of described resistance R 4 and the other end of resistance R 4 and one end of resistance R 5, capacitor C 3 is connected; The other end of the other end of described resistance R 5, capacitor C 3 is all connected with common ground end.
The operation principle of a kind of high-low pressure protective circuit of the utility model: in the normal work of electronic product; operating voltage when BATT provides machine normally to work; the in the situation that of operating voltage; the voltage of the BE utmost point of triode Q2 is greater than 0.7V; so Q2 this time is conducting, after Q2 conducting, LOW_DET is drawn as low level; MCU detects low level, illustrates that voltage that BATT provides is in operating voltage range.
Low-voltage detects: when the supply power voltage of BATT is less than 8V left and right, in design drawing, the voltage of the BE utmost point of triode Q2 is less than in the situation of 0.7V left and right in other words, triode Q2 is idle, in cut-off state, then LOW_DET is not drawn as low level signal, when MCU detects LOW_DET in high level signal, can make corresponding action, such as automatic shutdown.
High voltage detects: when the supply power voltage of BATT is greater than 17V, the BE of triode Q1 is greatly in 0.7V voltage, triode Q1 is in conducting state, thereby in design drawing, the voltage of this point of the B utmost point of triode Q2 has been dragged down, to such an extent as to the BE pole tension of Q2 is less than 0.7V, causes Q2 in cut-off state, and LOW_DET is in high level signal, when MCU detects LOW_DET in high level signal, can make corresponding action, such as automatic shutdown.
Below only with regard to most preferred embodiment of the present utility model, be described, 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 range of the utility model independent claims are all in protection range of the present utility model.
Claims (1)
1. a high-low pressure protective circuit, is characterized in that: comprise resistance R 1, R2, R3, R4, R5, voltage stabilizing didoe ZD1, ZD2, capacitor C 1, C2, C3, triode Q1, Q2; One end of described resistance R 1 is connected with one end of resistance R 2, one end of capacitor C 1; The other end of described capacitor C 1 is connected with common ground end; The other end of described resistance R 1 is connected with the negative electrode of voltage stabilizing didoe ZD1; The other end of described resistance R 2 is connected with the negative electrode of voltage stabilizing didoe ZD2; The anode of described voltage stabilizing didoe ZD1 with the c utmost point of triode Q1, one end of one end of capacitor C 2, resistance R 3, the b utmost point of triode Q2 be connected; The anode of described voltage stabilizing didoe ZD2 is connected with the b utmost point of triode Q1; The e utmost point of described triode Q1, the other end of capacitor C 2, the other end of resistance R 3, the e of triode Q2 are extremely all connected with common ground end; The c utmost point of described triode Q2 is connected with one end of resistance R 4; One end of the other end of described resistance R 4 and the other end of resistance R 4 and one end of resistance R 5, capacitor C 3 is connected; The other end of the other end of described resistance R 5, capacitor C 3 is all connected with common ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420147875.XU CN203734284U (en) | 2014-03-28 | 2014-03-28 | High-low voltage protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420147875.XU CN203734284U (en) | 2014-03-28 | 2014-03-28 | High-low voltage protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734284U true CN203734284U (en) | 2014-07-23 |
Family
ID=51204330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420147875.XU Expired - Fee Related CN203734284U (en) | 2014-03-28 | 2014-03-28 | High-low voltage protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203734284U (en) |
-
2014
- 2014-03-28 CN CN201420147875.XU patent/CN203734284U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20180328 |