US 2018/0019659 A1 · DC-DC POWER SUPPLY CONTROL CIRCUIT AND ELECTRONIC DEVICE

Abstract

A DC-DC power supply control circuit includes: a voltage stabilizing diode, a first resistor, a second resistor, a third resistor, a first triode and a second triode. Two ends of the first resistor are connected with an input end and an enable end of the DC-DC power supply respectively. Two ends of the second resistor are connected with the enable end and a collector of the second triode. A base electrode and an emitting electrode of the second triode are connected with a collector of the first triode and ground respectively. A negative electrode end and a positive electrode end of the voltage stabilizing diode are connected with an output end of the DC-DC power supply and a base electrode of the first triode respectively. Two ends of the third resistor are connected with the base electrode and the ground respectively. An emitting electrode of the first triode is grounded.

Claims11

Dependent claims

-9. (canceled)

A DC-DC power supply control circuit, comprising:

a voltage stabilizing diode, a first resistor, a second resistor, a third resistor, a first triode and a second triode;
wherein
an end of the first resistor is connected with an input end of the DC-DC power supply, and another end of the first resistor is connected with an enable end of the DC-DC power supply;
an end of the second resistor is connected with the enable end of the DC-DC power supply, and another end of the second resistor is connected with a collector of the second triode;
a base electrode of the second triode is connected with a collector of the first triode, and an emitting electrode of the second triode is grounded;
a negative electrode end of the voltage stabilizing diode is connected with an output end of the DC-DC power supply, and a positive electrode end of the voltage stabilizing diode is connected with a base electrode of the first triode;
an end of the third resistor is connected with the base electrode of the first triode, and another end of the third resistor is grounded;
an emitting electrode of the first triode is grounded;
and
resistance values of the first resistor and the second resistor meet following conditions:
V
i


n


min
*
(
R
2
R
1
+
R
2
)
≤
V
en
;
and
V
i


n


normal
*
(
R
2
R
1
+
R
2
)
≥
V
en
;
wherein
Vin min denotes a minimum working voltage of the DC-DC power supply, Vinnormal denotes a normal working voltage of the DC-DC power supply, Ven denotes a turn-on voltage of the enable end of the DC-DC power supply, R1 denotes a resistance value of the first resistor, and R2 denotes a resistance value of the second resistor.

54 more elements

A DC-DC power supply control circuit, comprising:

a voltage stabilizing diode, a first resistor, a second resistor, a third resistor, a first field effect transistor and a second field effect transistor;
wherein
an end of the first resistor is connected with an input end of the DC-DC power supply, and another end of the first resistor is connected with an enable end of the DC-DC power supply;
an end of the second resistor is connected with the enable end of the DC-DC power supply, and another end of the second resistor is connected with a drain electrode of the second field effect transistor;
a gate electrode of the second field effect transistor is connected with a drain electrode of the first field effect transistor, and a source electrode of the second field effect transistor is grounded;
a negative electrode end of the voltage stabilizing diode is connected with an output end of the DC-DC power supply, and a positive electrode end of the voltage stabilizing diode is connected with a gate electrode of the first field effect transistor;
an end of the third resistor is connected with the gate electrode of the first field effect transistor, and another end of the third resistor is grounded;
a source electrode of the first field effect transistor is grounded;
and
resistance values of the first resistor and the second resistor meet following conditions:
V
i


n


min
*
(
R
2
R
1
+
R
2
)
≤
V
en
;
and
V
i


n


normal
*
(
R
2
R
1
+
R
2
)
≥
V
en
;
wherein
Vin min denotes a minimum working voltage of the DC-DC power supply, Vinnormal denotes a normal working voltage of the DC-DC power supply, Ven denotes a turn-on voltage of the enable end (7) of the DC-DC power supply, R1 denotes a resistance value of the first resistor, and R2 denotes a resistance value of the second resistor.

54 more elements

Dependencies are inferred from the claim text.

Dc-dc power supply control circuit and electronic device

Life of this patent

Dc-dc power supply control circuit and electronic device

Life of this patent

Abstract

Claims11