CN102882203A - Power transmission system, device and protection circuit with power supply protection function - Google Patents
Power transmission system, device and protection circuit with power supply protection function Download PDFInfo
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- CN102882203A CN102882203A CN2011101968707A CN201110196870A CN102882203A CN 102882203 A CN102882203 A CN 102882203A CN 2011101968707 A CN2011101968707 A CN 2011101968707A CN 201110196870 A CN201110196870 A CN 201110196870A CN 102882203 A CN102882203 A CN 102882203A
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Abstract
The invention discloses a protection circuit which is electrically connected between a direct-current power supply for supplying direct-current power and a load and comprises a voltage comparer and a switch, wherein the voltage compare is electrically connected to the direct-current power supply to detect the direct-current power so as to obtain a detected voltage value and compares the detected voltage value with a safety range to judge whether the detected voltage value is in the safety range so as to provide a control signal; and the switch is provided with a first end for receiving the direct-current power, a second end electrically connected to the load and a control end for receiving the control signal. The first end and the second end of the switch can be switched between a conducting state and a non-conducting state according to the change of the logic level of the control signal; and when the detected voltage value is not in the safety range, the switch is in the non-conducting state under the control of the control signal, so that direct current is not supplied to the load.
Description
Technical field
The present invention relates to a kind of system, device and circuit, refer to especially a kind of transmission system, device and protective circuit with power supply protection function.
Background technology
As shown in Figure 1, be a kind of transmission system 1 in the past, comprise: a direct current power supply unit 10, and a load 11.
This DC power supply 10 is used for providing a direct current electric power.
This load 11 is electrically connected on this DC power supply 10 to receive this direct current power.
But this in the past transmission system 1 have following shortcoming:
1. if the voltage of direct current power is higher than the standard specification of this load 11, will cause this load 11 to be burnt.
2. if the voltage of direct current power is lower than the standard specification of this load 11, load 11 will be extracted the electric current that exceeds the quata from this DC power supply 10, and cause this DC power supply 10 to be burnt for keeping its rated power.
Summary of the invention
The first purpose of the present invention is that a kind of transmission system with power supply protection function is being provided.
Of the present invention this has the transmission system of power supply protection function, comprises:
One load; And
One has the power transmitting device of power supply protection function, comprising:
One direct current power supply unit is used for providing a direct current electric power; And
One protective circuit is electrically connected between this DC power supply and this load, and has:
One voltage comparator, be electrically connected on this DC power supply to detect this direct current power, and obtain a detection threshold, and come relatively this detection threshold whether in this safe range according to a safe range, provide accordingly one in control signal low, that high logic level changes; And
One switch, have one and be electrically connected on this DC power supply is electrically connected on this load with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator receiving the control end of this control signal, and make between this first end and this second end according to the logic level change of this control signal and to switch between conducting state and not on-state;
When this detection threshold was not in this safe range, this switch was subjected to this control signal control and is in not on-state, and will not be delivered to from the direct current power of this DC power supply this load.
Preferably, this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided; And
One or logical block, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this or logical operation to obtain this control signal.
Preferably, this voltage comparator also comprises:
One the 3rd resistance has one and is electrically connected on this or logical block receiving the first end of this control signal, and second end that this control signal is provided.
Preferably, make this detection threshold not in this safe range if the voltage of this direct current power is too high, then this first operation amplifier unit relatively this detection threshold make this first logical signal be in high logic level greater than this first reference voltage, and this second operation amplifier unit relatively this detection threshold makes this second logical signal be in low logic level greater than this second reference voltage, and then should or logical block make its control signal be in high logic level according to this first and second logical signal, and make this not conducting of switch.
Preferably, this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided;
One NOR-logic unit, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this NOR-logic computing to obtain this control signal; And
One the 3rd resistance has one and is electrically connected on this NOR-logic unit receiving the first end of this control signal, and second end that this control signal is provided.
Preferably, when this detection threshold was in this safe range, this switch was subjected to this control signal control and is in conducting state, being delivered to this load via this switch from the direct current power of this DC power supply.
The second purpose of the present invention is namely providing a kind of power transmitting device with power supply protection function.
The power transmitting device that this has the power supply protection function is applicable to be electrically connected on a load, and comprises:
One direct current power supply unit is used for providing a direct current electric power; And
One protective circuit is electrically connected between this DC power supply and this load, and has:
One voltage comparator, be electrically connected on this DC power supply to detect this direct current power, and obtain a detection threshold, and come relatively this detection threshold whether in this safe range according to a safe range, provide accordingly one in control signal low, that high logic level changes; And
One switch, have one and be electrically connected on this DC power supply is electrically connected on this load with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator receiving the control end of this control signal, and make between this first end and this second end according to the logic level change of this control signal and to switch between conducting state and not on-state;
When this detection threshold was not in this safe range, this switch was subjected to this control signal control and is in not on-state, and will not be delivered to from the direct current power of this DC power supply this load.
Preferably, this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided; And
One or logical block, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this or logical operation to obtain this control signal.
Preferably, this voltage comparator also comprises:
One the 3rd resistance has one and is electrically connected on this or logical block receiving the first end of this control signal, and second end that this control signal is provided.
Preferably, this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided;
One NOR-logic unit, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first and second logical signal, and carry out according to this NOR-logic computing to obtain this control signal; And
One the 3rd resistance has one and is electrically connected on this NOR-logic unit receiving the first end of this control signal, and second end that this control signal is provided.
The 3rd purpose of the present invention is namely providing a kind of protective circuit.
This protective circuit is applicable to be electrically connected between a direct current power supply unit and a load, and this DC power supply is used for providing a direct current electric power, and this protective circuit comprises:
One voltage comparator, be electrically connected on this DC power supply to detect this direct current power, and obtain a detection threshold, and come relatively this detection threshold whether in this safe range according to a safe range, a control signal that changes between low logic level and high logic level is provided accordingly; And
One switch, have one and be electrically connected on this DC power supply is electrically connected on this load with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator receiving the control end of this control signal, and make between this first end and this second end according to the logic level change of this control signal and to switch between conducting state and not on-state;
When this detection threshold was not in this safe range, this switch was subjected to this control signal control and is in not on-state, and will not be delivered to from the direct current power of this DC power supply this load.
Preferably, this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided; And
One or logical block, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this or logical operation to obtain this control signal.
Preferably, this voltage comparator also comprises:
One the 3rd resistance has one and is electrically connected on this or logical block receiving the first end of this control signal, and second end that this control signal is provided.
Preferably, make this detection threshold not in this safe range if the voltage of this direct current power is too high, then this first operation amplifier unit relatively this detection threshold make this first logical signal be in high logic level greater than this first reference voltage, and this second operation amplifier unit relatively this detection threshold makes this second logical signal be in low logic level greater than this second reference voltage, and then should or logical block make its control signal be in high logic level according to this first logical signal and this second logical signal, and make this not conducting of switch.
Preferably, when the detection threshold of this voltage comparator output was in this safe range, this switch was subjected to this control signal control and is in conducting state, being delivered to this load via this switch from the direct current power of this DC power supply.
Preferably, this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided;
One NOR-logic unit, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this NOR-logic computing to obtain this control signal; And
One the 3rd resistance has one and is electrically connected on this NOR-logic unit receiving the first end of this control signal, and second end that this control signal is provided.
Beneficial effect of the present invention is: if the voltage of direct current power is higher than the standard specification of this load, utilize this protective circuit to make the direct current power of this DC power supply not be delivered to this load, can protect this load to avoid burning; If the voltage of direct current power is lower than the standard specification of this load; utilize this protective circuit to make the direct current power of this DC power supply not be delivered to this load; can avoid this load to extract the electric current that exceeds the quata from this DC power supply, and can protect this DC power supply to avoid burning.
Description of drawings
Fig. 1 is a kind of block diagram of transmission system in the past;
Fig. 2 is the circuit diagram of the preferred embodiment of the transmission system of the present invention with power supply protection function; And
Fig. 3 is the circuit diagram of a distortion of this preferred embodiment.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples:
As shown in Figure 2, the present invention has the preferred embodiment of the transmission system of power supply protection function, comprises: a load 3, and a power transmitting device 2 with power supply protection function.
This power transmitting device 2 with power supply protection function is electrically connected on this load 3, and comprises a direct current power supply unit 20, and a protective circuit 21.
This DC power supply 20 is used for providing a direct current electric power.
This protective circuit 21 is electrically connected on 3 of this DC power supply 20 and this loads, and comprises a voltage comparator 22, and a switch S.
This voltage comparator 22 is electrically connected on this DC power supply 20 to detect this direct current power, and obtain a detection threshold Va, and come relatively this detection threshold whether in this safe range according to a safe range, provide accordingly one in control signal low, that high logic level changes.Wherein, this safe range is less than one first reference voltage Vref 1 and greater than one second reference voltage Vref 2, again Vref1＞Vref2.This voltage comparator 22 comprises: one first resistance R 1, one second resistance R 2, one first operation amplifier unit OP1, one second operation amplifier unit OP2, one or logical block OR, and one the 3rd resistance R 3.
This first resistance R 1 has one and is electrically connected on this DC power supply 20 to receive the first end of this direct current power, reaches one second end.
This second resistance R 2 has one and is electrically connected on the second end of this first resistance R 1 and the first end of this detection threshold Va is provided, and the second end of a ground connection.
This first operation amplifier unit OP1 has second end that is electrically connected on this first resistance R 1 receives this first reference voltage Vref 1 with the in-phase input end (+), that receives this detection threshold Va inverting input (-), and an output that one first logical signal Vo1 is provided.
This second operation amplifier unit OP2 has the second end that an in-phase input end (+), that receives this second reference voltage Vref 2 is electrically connected on this first resistance R 1 receiving the inverting input (-) of this detection threshold Va, and an output that one second logical signal Vo2 is provided.
Should or the logical block OR output that is electrically connected on the output of this first operation amplifier unit OP1 and this second operation amplifier unit OP2 receiving respectively this first and second logical signal Vo1, Vo2, and carry out according to this or logical operation to obtain this control signal.
The 3rd resistance R 3 has one and is electrically connected on this or logical block OR receiving the first end of this control signal, and second end that this control signal is provided.
This switch S has one and is electrically connected on this DC power supply 20 is electrically connected on this load 3 with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator 22 receiving the control end of this control signal, and make according to the logic level change of this control signal between first and second end of this switch S and switch between conducting state and not on-state.In the present embodiment, this switch S is a pmos fet, and its first end is that drain electrode, the second end are source electrodes, and control end is the grid that is electrically connected on the second end of the 3rd resistance R 3.
(during Vref1＞Va＞Vref2), this switch S is subjected to this control signal control and is in conducting state, being delivered to this load 3 via this switch S from the direct current power of this DC power supply 20 in this safe range as this detection threshold Va.Further specify at this, if the voltage Vin of this direct current power normally makes this detection threshold Va in this safe range, therefore this first operation amplifier unit OP1 relatively this detection threshold Va make this first logical signal Vo1 be in low logic level less than this first reference voltage Vref 1, and this second operation amplifier unit OP2 relatively this detection threshold Va makes this second logical signal Vo2 be in low logic level greater than this second reference voltage Vref 2, and then should or logical block OR according to first and second logical signal Vo1 that all is in low logic level, Vo2 and make its control signal be in low logic level, and make the switch S conducting of P transistor npn npn.
When this detection threshold Va was not in this safe range, this switch S was subjected to this control signal control and is in not on-state, then will not be delivered to from the direct current power of this DC power supply 20 this load 3.Further specify at this; make this detection threshold Va not in this safe range if the voltage Vin of this direct current power is too high; therefore this first operation amplifier unit OP1 relatively this detecting voltage Va greater than this first reference voltage Vref 1 (Va＞Vref1) make this first logical signal Vo1 be in high logic level; and this second operation amplifier unit OP2 relatively this detecting voltage Va greater than this second reference voltage Vref 2 (Va＞Vref2) make this second logical signal Vo2 be in low logic level; and then should or logical block OR make its control signal be in high logic level according to this first logical signal Vo1 and the second logical signal Vo2; and make the not conducting of switch S of P transistor npn npn; do not have superpotential direct current power to this load 3 and do not transmit this, can protect this load 3 to avoid burning.
Make this detection threshold not in this safe range if the voltage Vin of this direct current power is too low; therefore this first operation amplifier unit relatively this detection threshold less than this first reference voltage (Va＜Vref1) make this first logical signal Vo1 be in low logic level; and this second operation amplifier unit OP2 relatively this detection threshold less than this second reference voltage (Va＜Vref2) make this second logical signal Vo2 be in high logic level; and then should or logical block OR according to this first and second logical signal Vo1; Vo2 and make its control signal be in high logic level; and make the not conducting of switch S of P transistor npn npn; in the time of avoiding the undertension of direct current power; this load 3 is extracted the electric current that exceeds the quata for keeping its rated power from this DC power supply 20, therefore can protect this DC power supply 20 to avoid burning.
As shown in Figure 3, one of the present embodiment is deformed into: should or logical block OR change a NOR-logic unit NOR into, and change this P transistor npn npn into the N-type transistor and be used as switch S.Wherein, the output that this NOR-logic unit NOR is electrically connected on the output of this first operation amplifier unit OP1 and this second operation amplifier unit OP2 to be receiving respectively this first and second logical signal, and carries out according to this NOR-logic computing to obtain this control signal.This switch S is a NMOS field-effect transistor, and its first end is that drain electrode, the second end are source electrodes, and control end is the grid that is electrically connected on the second end of the 3rd resistance R 3.
In sum, above-described embodiment has the following advantages:
1. if the voltage Vin of direct current power is higher than the standard specification of this load 3, utilize this protective circuit 22 to make this direct current power not be delivered to this load 3, can protect this load 3 to avoid burning.
2. if the voltage of direct current power is lower than the standard specification of this load 3; utilize this protective circuit 22 to make this direct current power not be delivered to this load 3; can avoid this load 3 to extract the electric current that exceeds the quata from this DC power supply 20, and can protect this DC power supply 20 to avoid burning.
The above person of thought, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, the simple equivalence of namely generally doing according to the present patent application claim and invention description content changes and modifies, and all still belongs in the scope that patent of the present invention contains.
Claims (16)
1. transmission system with power supply protection function is characterized in that comprising:
One load; And
One has the power transmitting device of power supply protection function, comprising:
One direct current power supply unit is used for providing a direct current electric power; And
One protective circuit is electrically connected between this DC power supply and this load, and has:
One voltage comparator, be electrically connected on this DC power supply to detect this direct current power, and obtain a detection threshold, and come relatively this detection threshold whether in this safe range according to a safe range, a control signal that changes between low logic level and high logic level is provided accordingly; And
One switch, have one and be electrically connected on this DC power supply is electrically connected on this load with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator receiving the control end of this control signal, and make between this first end and this second end according to the logic level change of this control signal and to switch between conducting state and not on-state;
When this detection threshold was not in this safe range, this switch was subjected to this control signal control and is in not on-state, and will not be delivered to from the direct current power of this DC power supply this load.
2. the transmission system with power supply protection function according to claim 1, it is characterized in that: this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided; And
One or logical block, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this or logical operation to obtain this control signal.
3. the transmission system with power supply protection function according to claim 2, it is characterized in that: this voltage comparator also comprises:
One the 3rd resistance has one and is electrically connected on this or logical block receiving the first end of this control signal, and second end that this control signal is provided.
4. the transmission system with power supply protection function according to claim 2; it is characterized in that: make this detection threshold not in this safe range if the voltage of this direct current power is too high; then this first operation amplifier unit relatively this detection threshold make this first logical signal be in high logic level greater than this first reference voltage; and this second operation amplifier unit relatively this detection threshold makes this second logical signal be in low logic level greater than this second reference voltage; and then should or logical block make its control signal be in high logic level according to this first and second logical signal, and make this not conducting of switch.
5. the transmission system with power supply protection function according to claim 1, it is characterized in that: this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided;
One NOR-logic unit, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this NOR-logic computing to obtain this control signal; And
One the 3rd resistance has one and is electrically connected on this NOR-logic unit receiving the first end of this control signal, and second end that this control signal is provided.
6. the transmission system with power supply protection function according to claim 1; it is characterized in that: when this detection threshold is in this safe range; this switch is subjected to this control signal control and is in conducting state, being delivered to this load via this switch from the direct current power of this DC power supply.
7. power transmitting device with power supply protection function is applicable to be electrically connected on a load, and comprises:
One direct current power supply unit is used for providing a direct current electric power; And
One protective circuit is electrically connected between this DC power supply and this load, and has:
One voltage comparator, be electrically connected on this DC power supply to detect this direct current power, and obtain a detection threshold, and come relatively this detection threshold whether in this safe range according to a safe range, a control signal that changes between low logic level and high logic level is provided accordingly; And
One switch, have one and be electrically connected on this DC power supply is electrically connected on this load with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator receiving the control end of this control signal, and make between this first end and this second end according to the logic level change of this control signal and to switch between conducting state and not on-state;
When this detection threshold was not in this safe range, this switch was subjected to this control signal control and is in not on-state, and will not be delivered to from the direct current power of this DC power supply this load.
8. the power transmitting device with power supply protection function according to claim 7, it is characterized in that: this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided; And
One or logical block, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this or logical operation to obtain this control signal.
9. the power transmitting device with power supply protection function according to claim 8, it is characterized in that: this voltage comparator also comprises:
One the 3rd resistance has one and is electrically connected on this or logical block receiving the first end of this control signal, and second end that this control signal is provided.
10. the power transmitting device with power supply protection function according to claim 7, it is characterized in that: this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided;
One NOR-logic unit, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first and second logical signal, and carry out according to this NOR-logic computing to obtain this control signal; And
One the 3rd resistance has one and is electrically connected on this NOR-logic unit receiving the first end of this control signal, and second end that this control signal is provided.
11. a protective circuit is applicable to be electrically connected between a direct current power supply unit and a load, this DC power supply is used for providing a direct current electric power, and this protective circuit comprises:
One voltage comparator, be electrically connected on this DC power supply to detect this direct current power, and obtain a detection threshold, and come relatively this detection threshold whether in this safe range according to a safe range, a control signal that changes between low logic level and high logic level is provided accordingly; And
One switch, have one and be electrically connected on this DC power supply is electrically connected on this load with the first end, that receives this direct current power the second end, and one be electrically connected on this voltage comparator receiving the control end of this control signal, and make between this first end and this second end according to the logic level change of this control signal and to switch between conducting state and not on-state;
When this detection threshold was not in this safe range, this switch was subjected to this control signal control and is in not on-state, and will not be delivered to from the direct current power of this DC power supply this load.
12. protective circuit according to claim 11 is characterized in that: this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided; And
One or logical block, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this or logical operation to obtain this control signal.
13. protective circuit according to claim 12 is characterized in that: this voltage comparator also comprises:
One the 3rd resistance has one and is electrically connected on this or logical block receiving the first end of this control signal, and second end that this control signal is provided.
14. protective circuit according to claim 12; it is characterized in that: make this detection threshold not in this safe range if the voltage of this direct current power is too high; then this first operation amplifier unit relatively this detection threshold make this first logical signal be in high logic level greater than this first reference voltage; and this second operation amplifier unit relatively this detection threshold makes this second logical signal be in low logic level greater than this second reference voltage; and then should or logical block make its control signal be in high logic level according to this first logical signal and this second logical signal, and make this not conducting of switch.
15. protective circuit according to claim 11; it is characterized in that: when the detection threshold of this voltage comparator output is in this safe range; this switch is subjected to this control signal control and is in conducting state, being delivered to this load via this switch from the direct current power of this DC power supply.
16. protective circuit according to claim 11 is characterized in that: this voltage comparator comprises:
One first resistance has one and is electrically connected on this DC power supply to receive the first end of this direct current power, reaches one second end;
One second resistance has one and is electrically connected on the second end of this first resistance and the first end of this detecting voltage is provided, and the second end of a ground connection;
One first operation amplifier unit has second end that is electrically connected on this first resistance receives one first reference voltage with the in-phase input end, that receives this detecting voltage inverting input, and an output that one first logical signal is provided;
One second operation amplifier unit has the second end that an in-phase input end, that receives one second reference voltage is electrically connected on this first resistance to receive the inverting input of this detecting voltage, reaches an output that one second logical signal is provided;
One NOR-logic unit, the output that is electrically connected on the output of this first operation amplifier unit and this second operation amplifier unit to be receiving respectively this first logical signal and this second logical signal, and carry out according to this NOR-logic computing to obtain this control signal; And
One the 3rd resistance has one and is electrically connected on this NOR-logic unit receiving the first end of this control signal, and second end that this control signal is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101968707A CN102882203A (en) | 2011-07-14 | 2011-07-14 | Power transmission system, device and protection circuit with power supply protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101968707A CN102882203A (en) | 2011-07-14 | 2011-07-14 | Power transmission system, device and protection circuit with power supply protection function |
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| Publication Number | Publication Date |
|---|---|
| CN102882203A true CN102882203A (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101968707A Pending CN102882203A (en) | 2011-07-14 | 2011-07-14 | Power transmission system, device and protection circuit with power supply protection function |
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| Country | Link |
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| CN (1) | CN102882203A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814785A (en) * | 2015-11-30 | 2017-06-09 | 富泰华工业（深圳）有限公司 | The device of automatic identification input voltage |
| CN108233338A (en) * | 2016-12-15 | 2018-06-29 | 博世力士乐(西安)电子传动与控制有限公司 | Converter power supply device and the frequency converter comprising the device |
| CN108469869A (en) * | 2018-04-11 | 2018-08-31 | 京东方科技集团股份有限公司 | Upper electric control unit, method, power circuit and display device |
| CN112398334A (en) * | 2019-08-14 | 2021-02-23 | 飞虹高科股份有限公司 | Voltage-reducing integrated circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652061A (en) * | 2005-03-25 | 2005-08-10 | 威盛电子股份有限公司 | Computer host board and its power controller |
| CN1897383A (en) * | 2005-07-11 | 2007-01-17 | 佛山市顺德区顺达电脑厂有限公司 | Operation blocker and blocking method for user |
| CN101425031A (en) * | 2007-10-29 | 2009-05-06 | 英业达股份有限公司 | Multi voltage reference position detection circuit |
| US20100045117A1 (en) * | 2008-08-20 | 2010-02-25 | Hon Hai Precision Industry Co., Ltd. | Protection device for a power source and power unit using same |
-
2011
- 2011-07-14 CN CN2011101968707A patent/CN102882203A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652061A (en) * | 2005-03-25 | 2005-08-10 | 威盛电子股份有限公司 | Computer host board and its power controller |
| CN1897383A (en) * | 2005-07-11 | 2007-01-17 | 佛山市顺德区顺达电脑厂有限公司 | Operation blocker and blocking method for user |
| CN101425031A (en) * | 2007-10-29 | 2009-05-06 | 英业达股份有限公司 | Multi voltage reference position detection circuit |
| US20100045117A1 (en) * | 2008-08-20 | 2010-02-25 | Hon Hai Precision Industry Co., Ltd. | Protection device for a power source and power unit using same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814785A (en) * | 2015-11-30 | 2017-06-09 | 富泰华工业（深圳）有限公司 | The device of automatic identification input voltage |
| CN108233338A (en) * | 2016-12-15 | 2018-06-29 | 博世力士乐(西安)电子传动与控制有限公司 | Converter power supply device and the frequency converter comprising the device |
| CN108233338B (en) * | 2016-12-15 | 2021-04-30 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter power supply device and frequency converter comprising same |
| CN108469869A (en) * | 2018-04-11 | 2018-08-31 | 京东方科技集团股份有限公司 | Upper electric control unit, method, power circuit and display device |
| CN112398334A (en) * | 2019-08-14 | 2021-02-23 | 飞虹高科股份有限公司 | Voltage-reducing integrated circuit |
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Application publication date: 20130116 |