CN211556901U

CN211556901U - Battery charging control circuit of medical workstation

Info

Publication number: CN211556901U
Application number: CN201922499140.9U
Authority: CN
Inventors: 卓广君; 张锐; 夏恒; 冯刚; 纪泽涛
Original assignee: Shenzhen Joyree Technology Co ltd
Current assignee: Shenzhen Joyree Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-22
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a battery charging control circuit of medical workstation, including charging control chip and all power input circuit, excessive pressure detection circuit, overcurrent detection circuit, high temperature protection circuit, feedback circuit, the resonant circuit who is connected with it, connect MOS pipe control circuit between power input circuit and the charging control chip. The utility model discloses can improve the accurate control of charging voltage, charging current in the charging process, turn-off the protection when battery temperature and charging circuit's temperature is higher than the settlement temperature, make charge efficiency higher more stable, effectively reduce the potential safety hazard of production because of the high temperature in the charging process.

Description

Battery charging control circuit of medical workstation

Technical Field

The utility model relates to a charging circuit technical field, in particular to battery charging control circuit of medical workstation.

Background

The charging control circuit for the mobile workstation is a charging control circuit widely applied to occasions such as hospital ward, ICU, operating room, outpatient emergency call and the like, is suitable for battery charging and overvoltage and overcurrent protection of the mobile workstation, and mainly comprises a battery switch control circuit, battery overvoltage and overcurrent protection, a charging indicator lamp, charging current sampling and battery temperature detection. The charging mode that mainly adopts at present is singlechip PWM control, and the unable accurate control battery charging voltage of this kind of mode, electric current, the battery generates heat easily, and long-term the use has the potential safety hazard, therefore prior art needs to improve.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a battery charging control circuit of medical workstation.

In order to achieve the above purpose, the specific scheme of the utility model is as follows:

the utility model provides a battery charging control circuit of medical workstation, includes charging control chip and all connects with it power input circuit, overvoltage detection circuit, overcurrent detection circuit, high temperature protection circuit, feedback circuit, resonant circuit, connect MOS pipe control circuit between power input circuit and the charging control chip.

Preferably, the model number 3705 is adopted for the charging control chip.

Preferably, the MOS transistor control circuit includes a diode D1, a MOS transistor Q1 and a transistor Q3, the diode D1 is connected to the source of the MOS transistor Q1, the gate of the MOS transistor Q1 is connected to the collector of the transistor Q3, and the base of the transistor Q3 is connected to the charging control chip.

Preferably, the power input circuit comprises a power input socket and an anti-surge diode D3 connected with the power input socket.

Preferably, the feedback circuit comprises resistors R41-R43, R66, capacitors C8-C10 and C39, the resistor R43 is connected with the capacitor C9 in series, the resistor R66 is connected with the capacitor C10 in parallel, and the resistor R41 is connected with the resistor R42 after being connected with the capacitor C39 in parallel.

Preferably, the over-current detection circuit comprises parallel resistors R1, R5, R55 and R61.

Preferably, the overvoltage detection circuit includes a capacitor C3.

Preferably, the high temperature protection circuit includes a resistor R14.

Adopt the technical scheme of the utility model, following beneficial effect has:

the utility model discloses can improve the accurate control of charging voltage, charging current in the charging process, turn-off the protection when battery temperature and charging circuit's temperature is higher than the settlement temperature, make charge efficiency higher more stable, effectively reduce the potential safety hazard of production because of the high temperature in the charging process.

Drawings

FIG. 1 is a functional block diagram of the present invention;

fig. 2 is a circuit diagram of the power input circuit and the MOS transistor control circuit of the present invention;

fig. 3 is a circuit diagram of the other part of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the utility model provides a battery charging control circuit of medical workstation, including charging control chip U1 and all be connected with it power input circuit 1, overvoltage detection circuit 2, overcurrent detection circuit 3, high temperature protection circuit 4, feedback circuit 5, resonant circuit 6, connect MOS pipe control circuit 7 between power input circuit 1 and the charging control chip U1. Referring to fig. 3, the charging control chip U1 is of type CN3705, and includes circuits such as a comparator, an amplifier, and a filter.

Referring to fig. 2, the power input circuit 1 includes a power input socket J1 and an anti-surge diode D3 connected thereto, the MOS transistor control circuit 7 includes a diode D1, a MOS transistor Q1 and a transistor Q3, the diode D1 is connected to the source of the MOS transistor Q1, the gate of the MOS transistor Q1 is connected to the collector of the transistor Q3, and the base of the transistor Q3 is connected to a CHARGE _ ON/OFF pin (4/5 pin of U1) of the CHARGE control chip.

The external adapter inputs 24V/5A to a J1 socket, and when the input voltage is higher than the rated voltage, the D3 reverse breakdown protects a post-stage circuit; when the battery voltage is less than 18.6V, a 4/5 pin of the U1 outputs high level, the triode Q3 (model S8050) is conducted, the MOS transistor Q1 (model SI4435) is conducted in the forward direction, and the U1 is provided with working voltage. Conversely, when the input voltage is lower than the rated voltage, D3 is turned off in the forward direction. When the battery voltage is greater than 18.6V, the 4/5 pin of the U1 outputs low level, the Q3 is cut off, the Q1 is cut off in the positive direction, the U1 does not have working voltage, and the U1 does not work, so that the charging IC is effectively protected to work in a normal range.

Referring to fig. 3, the feedback circuit 5 includes resistors R41-R43, R66, capacitors C8-C10, and C39, the resistor R43 is connected in series with the capacitor C9, the resistor R66 is connected in parallel with the capacitor C10, and the resistor R41 is connected in parallel with the capacitor C39 and then connected with the resistor R42.

The voltage division circuit composed of R41, R42 and C39 feeds back to a pin 10 of U1 for detecting the battery voltage, the C10 and R66 carry out loop primary compensation, the R43 and C9 carry out loop secondary compensation, the C8 carries out loop tertiary compensation, and the U1 carries out voltage charging setting segmented feedback according to the ratio of the three loop compensations.

The overcurrent detection circuit 3 comprises parallel resistors R1, R5, R55 and R61, wherein the 14 pins and the 13 pins of the U1 sample voltages at two ends of the circuit, the magnitude of charging current is determined according to voltage difference at the two ends, and when the current detected by the 14 pin of the U1 is larger than the determined charging current, the 7 pin of the U1 starts current protection.

The overvoltage detection circuit 2 comprises a capacitor C3, when the battery voltage is higher than the rated set voltage, a high voltage signal is detected by the pin 13 of the U1, the high voltage signal is sent to a comparator inside a chip for signal amplification, the pin 1 of the U1 is controlled by comparing with a normal signal, and signal compensation is carried out through the C3.

The high-temperature protection circuit 4 comprises a resistor R14, when the temperature of the battery and the temperature of the charging plate are higher than the normal set temperature, a peak voltage is detected by a pin 6 of the U1, a signal is amplified and filtered by a voltage comparator inside the chip, the signal is regulated by R14, and the battery charging is stopped.

When the pin 15 of the U1 detects that the input voltage is higher than the rated input voltage, the pin 8 detects that the input voltage is higher than the reference voltage, and overvoltage protection is started to protect the U1 from high-voltage breakdown. When the pin 14 of the U1 detects that the input current is higher than the rated input current or the pin 7 detects that the input current is higher than the reference current, overcurrent protection is started, and the U1 is protected from high-current breakdown. The D5 and D6 form a charging state indicator, when the battery is fully charged, the D5 green light is on, and when the battery is charged, the D6 red light is on. C6, Q2, D2, D4 and L1 are charging resonant circuits 6, and output PWM pulse signals through 16 pins of U1 to continuously turn on Q2, and then continue energy through D4 and L1 to output stable charging voltage.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the protection scope of the present invention.

Claims

1. The utility model provides a battery charging control circuit of medical workstation, its characterized in that, includes the charging control chip and all connects power input circuit, overvoltage detection circuit, overflows detection circuitry, high temperature protection circuit, feedback circuit, resonant circuit with it, it controls the electricity to connect the MOS pipe between power input circuit and the charging control chip, the charging control chip adopts the model to be 3705, MOS pipe control circuit includes diode D1, MOS pipe Q1 and triode Q3, diode D1 is connected with MOS pipe Q1's source electrode, MOS pipe Q1's grid is connected with triode Q3's collecting electrode, charging control chip is connected to triode Q3's base.

2. The healthcare workstation battery charge control circuit of claim 1, wherein the power input circuit comprises a power input socket and an anti-surge diode D3 connected thereto.

3. The healthcare workstation battery charging control circuit of claim 2, wherein the feedback circuit comprises resistors R41-R43, R66, capacitors C8-C10, and C39, wherein the resistor R43 is connected in series with the capacitor C9, the resistor R66 is connected in parallel with the capacitor C10, and the resistor R41 is connected in parallel with the capacitor C39 and then connected with the resistor R42.

4. The healthcare workstation battery charge control circuit of claim 3, wherein the over-current detection circuit comprises parallel resistors R1, R5, R55, R61.

5. The healthcare workstation battery charge control circuit of claim 4, wherein the over-voltage detection circuit comprises a capacitor C3.

6. The healthcare workstation battery charge control circuit of claim 5, wherein the high temperature protection circuit comprises a resistor R14.